hybridfree/eevblog-posts huggingface dataset:
Pin 1 not marked clearly on L6599D (replacement of part) - Page 1
Forum section: electronics / projects

author: tom66
author_rank: Super Contributor
timestamp: March 12, 2014, 08:57:48 pm
content: I'm replacing an L6599D on an LG 42PQ3000 plasma TV PSU. Vs/Va tract MOSFETs shorted and the original is suspect (always replace driver IC when replacing FETs.)I've found that the new device does not have pin 1 marked!! Now, normally, I'd assume that the label-up orientation marks pin 1, but I am not certain. I don't want to make this assumption and destroy my new MOSFETs or worse cause further damage to the rest of the PSU.Device was purchased from Farnell, so I'm reasonably confident it's genuine.Any ideas? Am I missing something? I noticed some other variants of L6599D do have a pin 1 marking and it is in label up orientation. Still would like to be certain.Thanks

author: Niklas
author_rank: Frequent Contributor
timestamp: March 12, 2014, 09:06:17 pm
content: Look at the first datasheet screenshot and have a look at the edges along the long sides of the package, top right in Figure 37. The compare that to your pictures of the actual IC. Pin 1 will be on that side of the package that has a small angle instead of a sharp, square corner. In both pictures you have placed the package with pin 1 down left.

author: tom66
author_rank: Super Contributor
timestamp: March 12, 2014, 09:17:48 pm
content: That seems to be it, thanks! I've not seen that used before. Possibly cost saving: a simple mold?

author: Niklas
author_rank: Frequent Contributor
timestamp: March 12, 2014, 09:22:53 pm
content: I think I have seen it for many years but often in combination with the dot marking. If there is a dot then you might not think about this bevelled edge.

author: David_AVD
author_rank: Super Contributor
timestamp: March 12, 2014, 09:23:37 pm
content: Using a chamfered edge to indicate the pin 1 side of the chip seems pretty common these days.

author: Neilm
author_rank: Super Contributor
timestamp: March 14, 2014, 07:58:02 pm
content: Quote from: Niklas on March 12, 2014, 09:22:53 pmI have seen one manufacturer whose logo looked like the pin 1 dot - but it was on the wrong side exactly 180 degrees around. I would always look for the bevelled edge first and the dot second.
Pin 1 of AMPMODU II - Page 1
Forum section: electronics / projects

author: ricko_uk
author_rank: Super Contributor
timestamp: April 17, 2020, 07:08:41 pm
content: Hi,A bit of a silly question but I looked at all datasheets I could find of TE AMPMODU II connector and none seem to specify Pin 1 and neither does the 3D module nor in the mating physical part which I have. That is strange given that it is a polarised connector. It is not that important but I like to keep everything as standard as possible.With reference to the attached picture which would be pin 1? Most likely B or D, but which one?Thank you

author: HwAoRrDk
author_rank: Super Contributor
timestamp: April 17, 2020, 08:16:28 pm
content: What's the part number?The part drawings usually have pin 1 marked, like for example this:

author: ricko_uk
author_rank: Super Contributor
timestamp: April 17, 2020, 09:14:13 pm
content: Thank you HwAoRrDk,I just noticed I initially wrote AMPMODU instead of AMPMODU II. The part number is AMPMODU II - 280384-2.Your screenshot does not look like the AMPMODU II series (it doesn't seem to have the side walls). Is that perhaps some other AMPMODU series?Thank you

author: HwAoRrDk
author_rank: Super Contributor
timestamp: April 17, 2020, 09:27:41 pm
content: That was just a random AMPMODU part, because I know I had seen pin 1 notes on drawings for that series before.But it's curious that the drawing for that specific part doesn't have it.I suppose you'll just have to go on how other similar parts are numbered.

author: pigrew
author_rank: Frequent Contributor
timestamp: April 17, 2020, 09:36:12 pm
content: I've seen cases like this where there is no answer, it's up to the engineer.However, it seems like there is an answer for this product. The "mating connector" 280365's drawing shows "pin 1" labeled on one corner.The answer is D?

author: donotdespisethesnake
author_rank: Super Contributor
timestamp: April 17, 2020, 10:27:33 pm
content: You still have to be careful, some Molex connectors have pin 1 marked on the male and female parts, but for different position. Caused an interesting cockup in a prototype - each party concerned claiming they had correct pin out.

author: ricko_uk
author_rank: Super Contributor
timestamp: April 18, 2020, 12:25:24 am
content: Thank you all
Pin Cell Batteries (BR425, for example) - Page 1
Forum section: electronics / projects

author: BenAhrens
author_rank: Newbie
timestamp: May 01, 2014, 04:47:20 am
content: Has anyone worked with something likethis? I'm having a heck of a time finding any information on how these typically connect to a circuit - are they meant to be soldered to directly or are there PCB-mount plugs of some sort available? I've been all over Digikey, including contacting their tech support, who say they have nothing that connects with a BR425. I've done a lot of googling and looking at the Panasonic site. Nothing so far, but I figure somebody has to be using the things.
Pin Header - Page 1
Forum section: electronics / projects

author: bootloader9800
author_rank: Contributor
timestamp: February 04, 2021, 02:39:33 pm
content: Hey guys, Hello and hope all is well.I am looking for a 0.06 in spacing pin header. Does such a thing exist at all?Can you please name some american electronics stores that might carry it?Thx

author: penfold
author_rank: Frequent Contributor
timestamp: February 04, 2021, 06:09:41 pm
content: Hi,0.06 inches is frightfully close to 1.5mm...digikey or mouser will have themhttps://www.digikey.com/en/products/filter/rectangular-connectors-headers-male-pins/314?s=N4IgjCBcpg7AnABiqAxlAZgQwDYGcBTAGhAHsoBtEWAZgA4BWEAXRIAcAXKEAZQ4CcAlgDsA5iAC%2BUoA
Pin headers. . need help! - Page 1
Forum section: electronics / projects

author: step_s
author_rank: Regular Contributor
timestamp: February 11, 2016, 12:55:40 pm
content: Hi guys.I'm currently looking through the different types of pin headers and often the datasheets leave out a few measurements, so that the measurements of the resin part is unknown.Currently I'm looking for 90 degree male headers, with a small of a resin holder, as possible.If anyone knows where to find the in-depth measurements, please let me know.Also, I found this (see attachment) header on a picture on aliexpress, but can't find it, or its name:Hope you can help me.

author: Ian.M
author_rank: Super Contributor
timestamp: February 11, 2016, 01:30:50 pm
content: looks similar to:http://www.gradconn.com/Files/Drawings/BB02-1H.pdf

author: step_s
author_rank: Regular Contributor
timestamp: February 11, 2016, 02:04:46 pm
content: Cheers IanThese look very promising.Would you happen to know what sizes the A and B values come in? Or have a link for it?

author: Ian.M
author_rank: Super Contributor
timestamp: February 11, 2016, 02:33:58 pm
content: The datasheet has limits for A and B but it looks like they are custom ordered:http://www.gradconn.com/Search/BB02-1Hso you'd do better to search for other makes now you have the right search terms, unless you are going into volume production.

author: step_s
author_rank: Regular Contributor
timestamp: February 11, 2016, 03:21:10 pm
content: Ah yes, i missed that part with the minimum maximum.These headers are just perfect for the task.Thanks a lot Ian
pin order of routing a chip from the opposite layer - Page 1
Forum section: electronics / projects

author: john23
author_rank: Frequent Contributor
timestamp: November 23, 2024, 07:57:30 pm
content: Hello,I need to bias a chip from the opposite part of the chip.How the pin order of the chip changes with respect the top layer when i put the chip on the opposite layer as shown below?Thanks.https://www.minicircuits.com/pdfs/PMA5-83-2W+.pdf
Pinballs ! - Page 1
Forum section: electronics / projects

author: PinheadBE
author_rank: Regular Contributor
timestamp: January 14, 2018, 03:09:35 am
content: Pinballs are engineering masterpieces !From EM (electro-mechanical) ones to LCD displays (the latest generation) they are fun to play, and fun to fix when needed.The leading Belgian (French-speaking) Pinball forum has finally (finally !) opened an international section for English-speaking people.So, if you're looking for a "Freedom of Speech" platform, right in the middle of Europa, this is it !It's free, free of ads, and also scam free (I personnaly look for it !)Join us athttp://ericpinballforum.be/viewforum.php?f=58
Pink Noise - Page 1
Forum section: electronics / projects

author: johnny diaz
author_rank: Contributor
timestamp: August 03, 2013, 04:59:04 pm
content: I'd like to find an application where I can product Pink Noise in wav and mp3 format with a 6, 9, 12 db crest factor. Does anyone know of any?ThanksJohnny

author: lgbeno
author_rank: Frequent Contributor
timestamp: August 03, 2013, 08:24:46 pm
content: I think that there are examples on Wikipedia of pink noise otherwise maybe wolfram alpha?I think that you could also construct a frequency plot of pink noise in matlab or python then calculate the ifft to get a time domain waveform.Sent from my iPhone using Tapatalk 2

author: johnny diaz
author_rank: Contributor
timestamp: August 04, 2013, 02:36:13 pm
content: Lgbeno,Thank you for your response. I looked at wikipedia, They have a player which plays pink noise but I'd like to create pink noise with different crest factors so that wont work. Matlab and tython appear to be to complicated for me. Any other options? I'd like to create pink noise with different crest factors.Thanks,Johnny

author: lgbeno
author_rank: Frequent Contributor
timestamp: August 04, 2013, 03:07:19 pm
content: Python(x,y) makes things pretty easy and it's free.Found something called python noise generator on google, no idea what's its all about but sounds worth looking into.Sent from my iPhone using Tapatalk 2

author: branadic
author_rank: Super Contributor
timestamp: August 04, 2013, 03:29:38 pm
content: Matlab/Octave are pretty easy to use as many functions are already available or solutions are shown:http://www.mathworks.de/support/solutions/archived/1-16842.html

author: 6502nop
author_rank: Regular Contributor
timestamp: August 05, 2013, 11:23:12 am
content: Ermmm... Audacity?Not exactly sure what you mean by "Crest Factor" (toothpaste?), but if it's what I think, then try:Generate -> Noise -> (dropdown) Pink/Level/durationI chose 24 seconds at full volume (1). Then:Select first 3 seconds and Effect -> Amplify -> set to ~ -12dBSelect next 3 seconds and Effect -> Amplify -> set to ~ -9dBSelect next 3 seconds and Effect -> Amplify -> set to ~ -6dBSelect next 3 seconds and Effect -> Amplify -> set to ~ -3dBSkip next 3 seconds (0dB)Select next 3 seconds and Effect -> Amplify -> set to ~ -3dBSelect next 3 seconds and Effect -> Amplify -> set to ~ -6dBSelect next 3 seconds and Effect -> Amplify -> set to ~ -9dBThen export to file of your choosing. This will provide you with a loopable (?) -12 to 0 to -12dB in 3dB steps every 3 seconds. This is why you can skip putting an extra 3 seconds of -12 last, as if you loop it, it will give you 6 seconds @-12dB.So, it took me all of a couple minutes to do, and here ya go...nop(You're welcome.)Edit: WAV was too big (barely), cut the steps to 2 seconds...

author: branadic
author_rank: Super Contributor
timestamp: August 05, 2013, 11:34:10 am
content: Crest factor is similar to the standard deviation:sigma - Crest factor - % inside the distribution1 - 2 - 68.26894922 - 4 - 95.44997363 - 6 - 99.73002044 - 8 - 99.9936665 - 10 - 99.99994266976 - 12 - 99.99999980277 - 14 - 99.9999999997440
Pinout For Dell PSU Server E750E-S1 / D1600E-S0 - Page 1
Forum section: electronics / projects

author: Nik_01
author_rank: Newbie
timestamp: December 11, 2024, 09:46:10 am
content: Hi everyone,I recently got my hands on two Dell server power supplies from a friend. The models are:E750E-S1D1600E-S0These power supplies don't have standard output pins but use a card edge connector instead. I'm looking for the pinout of both models so I can test them properly.Does anyone have any schematics, pinout diagrams, or related documentation for these power supplies? Your help would be greatly appreciated.Thanks in advance!

author: ahrlad
author_rank: Contributor
timestamp: December 11, 2024, 11:02:45 am
content: This is from a related power supply:source:https://forum.digikey.com/t/what-card-edge-connector-is-used-on-dell-e750e-s0-server-psu/28826/4
Pinout for GNS FM6 TMC receiver? - Page 1
Forum section: electronics / projects

author: brainwash
author_rank: Frequent Contributor
timestamp: July 22, 2013, 05:34:37 pm
content: http://www.gns-gmbh.com/index.php?id=104&L=1I have an active cradle from a GPS unit and the manufacturer denies it has any TMC functionality although it comes with this chip inside the cradle AND an FM antenna. Nevertheless, I could not get any signal to show up on the scope from this capsule and I probed all the pins.I only need the TX pin, I can work out the stuff from there. Perhaps some pull-ups or pull-downs are deactivated causing the chip not to go live. The 3.3V supply is available.From what I've been able to read on the forums some Navigon TMC receivers also use this module inside.

author: brainwash
author_rank: Frequent Contributor
timestamp: July 30, 2013, 01:54:40 pm
content: Any update on this? I haven't tried playing more with it but it's not giving out any signal so it might not be powered correctly.
Pinout for Kidde Nighthawk CO Detector LCD - Page 1
Forum section: electronics / projects

author: Cyberdragon
author_rank: Super Contributor
timestamp: March 19, 2018, 11:07:16 pm
content: I found what appears to be the LCD module from one of these in some junk. Any possibility of getting info on the pinout and voltage?I have no idea what model it's from. All it says is "NIGHTHAWK 800-0138", so I hope that's the board number. It's possible they all use the same or similar display, so the info on any one of them might work.The screen itself is screwed on, so I might be able to take it off (if it's not glued) and see if there's info on the board under it.EDIT: Some models appear to have decimals while others don't. I can try to shine a light in the module to see if I can see any. But then again, they all might have them and the code just doesn't use them in some models.

author: johnkenyon
author_rank: Regular Contributor
timestamp: March 21, 2018, 02:24:55 pm
content: If its a "bare" display without a controller, you might be able to work out the pinout using the LCD tester described athttp://www.learningelectronics.net/circuits/liquid-crystal-display-lcd-tester.html(noting that the website stole the circuit diagram from Elektor magazine).

author: Cyberdragon
author_rank: Super Contributor
timestamp: March 21, 2018, 07:40:44 pm
content: It has a COB controller on the back, and six wires.Two will be power, so that means a four wire interface of some sort.

author: asas
author_rank: Newbie
timestamp: November 15, 2023, 05:27:15 pm
content: I don't have any datasheet and have only reverse engineered the original CO meter. The device uses 3xAA so I guess 3..5V should work and it seems to work fine down to 2V. The display interface works similarly to a shift register. The data is read on the falling edge of the clock. In my display there are 4 data bits before the visible segments and 13 after (for a total of 44 bits). The pinout is as follows:1. VCC2. Latch3. Clock4. GND5. Data6. ~40 Hz square waveI know this is an old topic, but it's the only one I could find related to this LCD.
Pinout of a Dell D750E-S6 server psu - Page 1
Forum section: electronics / projects

author: JJalling
author_rank: Unknown
timestamp: July 14, 2019, 03:36:45 pm
content: Hello all,can someone help me with the pinout if a Dell D750E-S6 server PSU? The part no. on the PCB is DPS-750AP-15.The connector of the PSU is a PCB connector, with what looks like 2 big ground connections, 2 big connections for VCC and a 24 pin connector for control.Br Jonas

author: coromonadalix
author_rank: Super Contributor
timestamp: July 14, 2019, 07:28:32 pm
content: Maybe this one ?https://www.rcgroups.com/forums/attachment.php?attachmentid=4013688

author: JJalling
author_rank: Unknown
timestamp: July 15, 2019, 05:51:54 am
content: Hello, and thanks for the suggestion.No unfortunately that one doesn't match - it has only 16 pins on the auxiliary connector and not 24.BR Jonas

author: JJalling
author_rank: Unknown
timestamp: April 19, 2023, 04:31:34 pm
content: If anybody still cares, the PSU shares pinout with the DS750PED PSU from ARTESYN.Please see attached DS:https://www.artesyn.com/assets/ds750ped_ds_7db9fb58cc.pdfFor the lazy people:S13 - PS_ON_LS14 - PS_KILL_Lshould both be connected to GND (S6, S10, S16, S18, S20, S22 or S24) for the PSU to turn on.PMbus is available on S17 & S19 (SDA, SCL respectively).BR Jonas

author: ERO
author_rank: Newbie
timestamp: May 25, 2023, 08:12:40 am
content: Hello,Thanks for posting this, much appreciated. I have 4 of these and have been looking for this for a while.Do you know if it is possible to adjust the output voltage? 13.5V would be more useful than 12V.CSL

author: Blue Smoke Master
author_rank: Newbie
timestamp: October 05, 2024, 07:50:01 pm
content: Additionally, i was able to confirm this is also a direct form-fit-function (and pinout) match to the Delta Electronics DPA-750EB power supply.Thanks for the data sheet info. I was trying to find the remote sense pins.
Pinout of Metcal PS-1100 - Page 1
Forum section: electronics / projects

author: Everbrave
author_rank: Regular Contributor
timestamp: June 30, 2025, 09:30:46 pm
content: Hi,Anybody knows the pinout of Metcal PS-1100 8-pin plug?Of course I could go and inspect all pin combinations with an oscilloscope but I need to terminate the pin-pairs due to the RF output.Any help is greatly appreciated:)Thanks

author: thm_w
author_rank: Super Contributor
timestamp: June 30, 2025, 10:06:55 pm
content: If its the same pinout as the 8 pin MFR its here:https://www.pa4tim.nl/diversen-onderwerpen/metcal-mfr-1351-review/You can still do it with a scope by opening up the station and probing from the inside.You could also check if it has a signal just after power on, no termination should be needed. The 13MHz units do, but maybe the 450kHz units don't as they have additional wiring that can be used for sensing.

author: Everbrave
author_rank: Regular Contributor
timestamp: July 02, 2025, 10:31:42 am
content: Quote from: thm_w on June 30, 2025, 10:06:55 pmThanks a lot; it might well be; will check

author: Everbrave
author_rank: Regular Contributor
timestamp: July 03, 2025, 08:06:04 pm
content: Unfortunately, no success so far. I don’t want to open the case for not to render the guarantee void, so, I probed the plug from outside with an oscilloscope and a multimeter. I couldn’t find a pair with a relevant voltage level and/or 450kHz output.My guessing is that some pins on the hand piece make a bridge somehow to enable the 450kHz oscillator.Any ideas?Any one knows of a schematic fro the Metcal mfr-1110?Edit: first, I will check the property ground connection bet. The PS unit and the hand piece.

author: thm_w
author_rank: Super Contributor
timestamp: July 03, 2025, 10:49:57 pm
content: The signal should be reference to earth, so you can just probe with the tip of the scope. But yes there may be a requirement to bridge two pins or sense a resistance before the output turns on.You can check in the handle of the iron, are any pins shorted together? Are any pins connected to the outer shield?If it has the same 3 pins shorted to the shield as the MFR then I would assume the rest of the pins are the same.

author: Everbrave
author_rank: Regular Contributor
timestamp: July 04, 2025, 02:08:05 pm
content: Quote from: thm_w on July 03, 2025, 10:49:57 pmSuccess!It wasn’t the ground connection but the pin allocation is mirrored w.r.t those in the link you sent; or in other words, the notch is upside down and it requires that the cartridge is inserted. Probably, it needs the -low- impedance to activate the oscillator and set the lower LED to green.Now, the hand piece adapter for the sp-200 is completed (refer to the earlier post) and the SSC cartridge can be used with the mfr-1110https://www.eevblog.com/forum/reviews/adapting-metcal-sp-200-sp-hc1-hand-piece-to-mfr-ps-1100/msg5625903/#msg5625903

author: TaylorD93
author_rank: Regular Contributor
timestamp: July 16, 2025, 08:24:02 pm
content: Hey! id like to try this mod too, do you have a pinout for the PS-1100 vs the SP-200?Do the hand probes work straight away or do you need to cut off and solder a new DIN plug on?
Pinouts for Oriental Motors AS series motors and drivers - Page 1
Forum section: electronics / projects

author: CambridgeMart
author_rank: Regular Contributor
timestamp: June 15, 2020, 11:01:36 am
content: I have a pair of Oriental Motors ASD36 stepper motor drivers which have a 10 pin Molex mini-fit jr. connector for the motor. I'm unable to locate any information on the wiring for this connector and Oriental won't help as it's an obsolete product. Has anyone got any information on these? An AS series motor with the 10 way connector fitted would be a starting point to test what windings connect where if anyone has one they can check.

author: ebclr
author_rank: Super Contributor
timestamp: June 16, 2020, 08:04:48 am
content: Stepper motors can be a generator, With an oscilloscope, you will easily discover where the coils are just turning the axes and check if a transient appears on the scope.

author: ace1903
author_rank: Regular Contributor
timestamp: June 16, 2020, 08:46:35 am
content: I have 10pin steppers from other manufacturer that are 5phase steppers. Now days are very rare and require specialized motor driver.I can not find suitable controller and that is why I searched Oriental motors. They have 5phase stepper controllers in their product line.

author: CambridgeMart
author_rank: Regular Contributor
timestamp: June 16, 2020, 09:52:11 am
content: The problem is I'm trying to work out the pinout of the driver, not the motor! The drivers are for bi-phase motors.

author: ace1903
author_rank: Regular Contributor
timestamp: June 16, 2020, 10:33:34 am
content: That makes things easier. Open the box, see what driver chip it uses and trace connections from driver chip to output pins.In general by looking of output stage design one can find out pinout. You can post pictures of internals so we can try to help.

author: CambridgeMart
author_rank: Regular Contributor
timestamp: June 16, 2020, 10:54:07 am
content: The MOSFETS are driven from an ASIC, so it's not that easy! I do know what pins the MOSFETs are connected to, so I may just have to make a test load so use so I can scope the outputs.

author: wizard69
author_rank: Super Contributor
timestamp: June 20, 2020, 02:38:39 am
content: I'm not sure if this will help but can we assume straight through ribbon cable type interconnections? It should be easy to find the coils on a stepper shorting across the coil (one at a time) should drastically increase the rotation torque. You only have 10 pins so some quick checking with an ohmmeter should tell you candidate coils.

author: CambridgeMart
author_rank: Regular Contributor
timestamp: June 21, 2020, 12:47:55 am
content: If I had a motor to check it would be easy! Sadly, the motor has had the connector cut off so I have nothing to go with. Hence why I have asked for help from someone who has the information.
Pins (female) designation for Molex 0511460400 connectors? - Page 1
Forum section: electronics / projects

author: PP3331
author_rank: Contributor
timestamp: February 21, 2020, 04:19:13 am
content: Hi. I managed to obtain the Molex 0511460400 connectors that I needed, but discovered unexpectedly that they were shipped without the (female) pins required. The connectors are extremely small, and none of my existing Molex pins will fit. Nor have I so far been able to find the Molex part number for the required pins, not even on the Molex site. Any suggestions? Thanks!

author: tooki
author_rank: Super Contributor
timestamp: February 21, 2020, 03:50:45 pm
content: Quote from: PP3331 on February 21, 2020, 04:19:13 amReally?Really?I googled “Molex 0511460400” and the second result was thePDF datasheet, which says right on it:QuoteThedimensional drawingsays on it: “APPLICABLE TERMINAL: 50641-8***”.The datasheet and every product page from vendors tells you it’s part of the PanelMate series, and googling “molex panelmate terminal” also produces the two compatible terminals as the first two search results.What I will grant you is that the molex website appears to be totally borked at the moment. None of their product links seem to work.

author: PP3331
author_rank: Contributor
timestamp: February 21, 2020, 04:55:39 pm
content: Their site seems to be working better this morning and the pins do identify specifically as 506418141. Thanks!
Pioneer AVIC-D3 - Page 1
Forum section: electronics / projects

author: markm6164
author_rank: Contributor
timestamp: November 10, 2012, 10:36:02 pm
content: I have a Pioneer AVIC-D3 with a problem. The unit works fine except the LCD backlight doesn't work, well i would come on for a second the straight back off. The backlight is a Cold Cathode fluorescent lamp.I have attached the inverter circuit for the CCFL.The whole manual can be downloaded fromhttp://elektrotanya.com/?q=showresultfor free by searching AVIC-d3.Anyway, there is a dedicated ccfl driver chip marked OZ961ISN. Searching the datasheet for this chip doesn't show much but searching a OZ960 brings up this datasheethttp://monitor.espec.ws//files/oz960_applicationsschema_189.pdfWhich is identical to the driver chip on the board and has the same pinout.So the main problem i found was on pin 10 of the driver chip labelled CMP i was getting 4 volts which is too much. So because i couldn't isolate the cause of why it was so high i connected an led between pin 10 and gnd which dropped the voltage to around 2 volts. This solved everything, the unit powers up, the ccfl lights and everything works. Although this isn't good because its not a fix, only a hack.Anyways all was well but now after about 30mins of running the 5v rail drops off. After tracing it back to the main board there is a smd 1A fuse.I replace this fuse and the same thing happens again. I suspect it has something to do with the led i hacked in so what i need is some help to find the true cause of the problem. The driver chip has inbuild overload and underload protection and its seeing something on the feedback pin or pin 10 thats not right.Hope i have explains clearly enough and hope you can help.Mark

author: amyk
author_rank: Super Contributor
timestamp: November 11, 2012, 10:32:06 am
content: Check the CCFL circuit for high resistance connections. The tube might be wearing out too, which is why it's needing more voltage than it should. By clamping the CMP pin down you've basically disabled the OVP, and as a result the inverter is running outside of its rating, drawing too much power and blowing the fuse.

author: markm6164
author_rank: Contributor
timestamp: November 11, 2012, 12:41:26 pm
content: I think your right with the ccfl worn out of spec. Probably the end of the life for this unit.

author: markm6164
author_rank: Contributor
timestamp: November 11, 2012, 04:19:15 pm
content: Do you think i could change the CCFL? I have opened LCD case and can access the CCFL. If i could find a replacement maybe i can change it??

author: ElektroQuark
author_rank: Unknown
timestamp: November 12, 2012, 08:03:06 am
content: Check capacitors on the CCFL supply.
Pioneer DEH-2700RB schematic - Page 1
Forum section: electronics / projects

author: pesky
author_rank: Newbie
timestamp: December 22, 2013, 05:53:05 pm
content: Hey guys, I've been toying with an idea of making an AUX input for my old car stereo and I stumbled upon this tutorial:http://www.instructables.com/id/MP3-player-quotinputquot-for-car-stereo/?ALLSTEPSBasically you hardwire your 3,5mm jack in CD output and fool the radio into thinking it is playing a CD. All good but when I opened my stereo I foud out the circuit board is not marked, not even on the other side. I need to identify left channel (LOUT), right channel (ROUT) and ground (AGND) in order to solder in the cable.How can I identify these? I can solder, but have little knowledge in electronics, I just repair some broken wires or headphones sometimes.Pictures are of the-guy-who-wrote-the-tutorial's CD player board and mine (unmarked).thanks in advance!
Pioneer VSX-1021 Audio recieve issue - Page 1
Forum section: electronics / projects

author: NewfieTechie
author_rank: Newbie
timestamp: March 08, 2013, 07:17:24 pm
content: Hello everyone,Inspired by how quickly and accurately the community was able to help Dave on his Yamaha receiver (), I thought maybe someone could help me out as well.I have a Pioneer VSX-1021 receiver with its MCACC light flashing. It will start up with the "MULTIZONE ON/OFF" + "TUNE DOWN" button combo, but right away gives the "AMP OVERHEAT" error and shuts down.I have tested most components on the SMPS board to no avail. I also tested all of the Push/Pull amp pairs - they all seem to be good. No obvious signs of damage to be seen.Anyone know what would cause this error to come up instantly? Maybe it did overheat once and needs a reset that I can't figure out? (Note the unit is not mine but a friends, so I do not know in detail the events leading up to the problem.)Regards,AndrewNewfieTechie

author: NewfieTechie
author_rank: Newbie
timestamp: March 13, 2013, 11:14:04 am
content: Any input here guys?
PIR motion sensor interface for a microcontroller - Page 1
Forum section: electronics / projects

author: e100
author_rank: Frequent Contributor
timestamp: June 22, 2019, 03:57:37 am
content: I have a typical PIR sensor as you would find in a home security system. It has an isolated reed relay that opens when motion is detected (or when power is disconnected). I believe in alarm terminology this is called a "normally closed" circuit, which confusingly means that it uses a "normally open" relay (closes when energised).These are used with long cables (non-twisted conductors), have to be resistant to interference, and be super reliable.I went looking for examples of alarm panel interface circuit diagrams but could only find installation wiring diagrams, however there are various documents describing the use of "end of line" resistors to detect wiring faults, and these are typically 5.6k which given the typical 12v supply means that loop currents are in the sub 2mA range.Does this point to interfaces using opto isolators or would they be using a direct connection to the microcontroller ADC/digital input with protection resistor & clamping diodes?

author: viperidae
author_rank: Frequent Contributor
timestamp: June 22, 2019, 07:02:13 am
content: They would be using two comparators to detect open circuits and short circuits. That's why they have a resistor in there that is significantly higher than the wire resistance.You could also just an opamp as a buffer to feed an ADC.
PIR Problem disappear when probing - Page 1
Forum section: electronics / projects

author: fedimakni
author_rank: Regular Contributor
timestamp: May 25, 2020, 09:35:27 am
content: Hello,I am currently facing really weird problemI am using a PIR sensor panasonic one EKMB1300100KI have an LED which blink when it detect movement. The problem here that it keeps blinking always but when i probe with the oscilloscope at the PIR pin exactly the problem disappear and return to work normally, even after removing the probe it keeps working ( removing the power and power on again also work fine ) The probelm only at the startup. I tried 5 PCBs with the same config and all of them have the same behavior.I want to fix this problem if someone have any solution please do not hesitate.Thanks

author: floobydust
author_rank: Super Contributor
timestamp: May 25, 2020, 08:50:27 pm
content: After power up, it takes 30 seconds for the PIR sensor to stabilize. So during startup, the sensor will not work well. Try wait a while before doing your tests.The Panasonic modules have very low output current (FET source) 100uA and needing a pulldown resistor. It's not enough current to drive an LED without adding a transistor. Drawing more than 100uA can cause false triggers.The sensors also need clean power, so your scope ground might be affecting electrical noise if the sensor has a weird power supply. Or the probe capacitance is affecting your output.If you want more help, post your schematic.

author: Kasper
author_rank: Frequent Contributor
timestamp: May 26, 2020, 04:06:18 am
content: PIR circuits sometimes use high value resistors. So high that the resistance of your scope can effect your circuitTry replacing your scope probe with a 10 M ohm resistor. Try with a 1 M ohm also.When you add that resistor to your circuit, does it behave the way it does when you add the scope probe to it?If it does then try adding it to your schematic and think about what effect that has.
pir question - Page 1
Forum section: electronics / projects

author: KrisMcLean
author_rank: Newbie
timestamp: August 12, 2025, 08:23:35 am
content: Wanted to tap into the pir movement sensor on an outdoor solar powered security light but instead of the classic pir where the centre pin goes hi when movement is detected I found this particular sensor seems to be frantically scanned on it's centre pin, worse still the jittery erratic scanning doesn't seem to change much when movement is detected. Worse still the part number PIR ps3420 doesn't show up in a google search. Anyone else comes across this sort of PIR implementation?
PIR Testing - Page 1
Forum section: electronics / projects

author: MotoDan
author_rank: Contributor
timestamp: June 13, 2023, 03:08:11 am
content: Does anyone have any experience with production testing of Passive Infrared (PIR) sensors? My current method is to illuminate the sensor with a small filament lamp with the PIR in an enclosed hood. The test works about 90-95%of the time, but some sensors won’t respond to the light, but will to hand motion. I’ve tried various wavelength LED’s including visible and IR. The filament lamp works the best so far, but is not perfect. My research indicates that PIR sensors are designed to be sensitive to radiation with wavelengths in the 8-14 um or “far infrared” range.The PiR under test is the Senba BS412,https://www.nysenba.com/pir/bs412.htmlThanks!

author: mjs
author_rank: Regular Contributor
timestamp: June 13, 2023, 05:55:43 am
content: The detector has two elements inside and it's the difference of those in thermal radiation that triggers it.If the detector is without a lens:- illuminate the other half with a bulb or heater resistor (like 5W resistor dissipating 4W) at 5-20cm distance- add a shutter that opens slowly right in front of detector, exposing first the other half and then the otherIf there is a lens:- Have a warmed up +10°C over ambient painted (not clear metal, as its emissivity is low) plate in front of sensor (50-100cm)- Add similar shutter closer to the plate rather then closer to the plateDoing this well without moving parts may be difficult depending on the frequency (or rather time) response of the sensor electronics.
PIR with logic output - Page 1
Forum section: electronics / projects

author: drvtech
author_rank: Regular Contributor
timestamp: October 21, 2020, 09:58:01 pm
content: Does anyone know of a source for PIR detectors with a logic output in aTO-5 can? I have some security lights which use them and a couple of them have failed. These look just like the standard PIR sensors but clearly have the amplifier and LPF stages inside the can (very handy!). I know they must be available at a sensible price, as they are used in very low cost security lights, but I can't find them at any of the usual suppliers. These ones are running from a single Li-Ion cell so about 4V. Thanks, Dave

author: HwAoRrDk
author_rank: Super Contributor
timestamp: October 21, 2020, 10:26:47 pm
content: Have you tried LCSC?https://lcsc.com/products/Infrared-Sensors_930.htmlThey carry sensors from Senba, and I know they make 'digital' 4 pin PIR sensors.

author: drvtech
author_rank: Regular Contributor
timestamp: October 21, 2020, 11:02:16 pm
content: Wow, that was quick! Yes, the AS312 is the one. 3 pin TO-5 logic output. Thanks a million!
Pizza Oven to Reflow Oven Conversion Project - Page 1
Forum section: electronics / projects

author: mdszy
author_rank: Unknown
timestamp: May 29, 2017, 12:54:11 am
content: Pretty excited... one of the first real projects that I've made here in my little basement lab at home. I got a pizza oven for $7 from my university that was used previously by the EE department for reflowing boards. However, it only had two controls: one that was a timer that would switch it off after it expired, and another that chose to either heat up one or both heating element. I wanted something a bit more controllable so I hacked in a cheapo $20 ebay temperature controller to make it into a reflow oven!There are a couple of things that I could've done better and/or can improve in the future.1. Fewer mains connectors... The project has 3 (three!) separate mains connectors. One for the oven, one for the temperature controller and one for a 12V plug pack that powers the coil of a larger 12A relay inside the oven. The temperature controller relay is only rated for 3A... definitely not suitable for the 1450W oven!2. An actual reflow controller. To be honest, this is less of a "reflow oven" and more of a "set a temperature" oven.Included is a photo of the final result, and here are some videos of my progress through it andhere's a link to the hackaday.io project pagefor anyone interested!
PL2303 GPIO Configuration - Page 1
Forum section: electronics / projects

author: ludzinc
author_rank: Unknown
timestamp: April 28, 2014, 01:48:00 pm
content: Hi AllCan anyone assist with information on how to configure the GPIO pins on the Prolific PL2303?I see on proflic's site that they can provide source code examples, but I was hoping a configuration tool of some type exists.Thanks,Ludzinc

author: ludzinc
author_rank: Unknown
timestamp: April 30, 2014, 02:19:14 am
content: Welp,I did the obvious and email Prolific for help - and they were very helpful! FYI, here's what they said:~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~You can download GPIO Tool from our Support webpage.You need to log-in first using user/password as “guest” and “guest”.PL-2303 USB to Serial Bridge Controllers (All Chip Versions) Application Note & User Manualhttp://www.prolific.com.tw/US/CustomerLogin.aspx(enter “guest” for user and password)http://www.prolific.com.tw/admin/Technology/GetFile.ashx?fileID=260File NameRelease DateVersionFile SizePL2303HX_GPIO_LED.zip2009/12/181.0.05698.79KBPL2303HXD GPIO LED Indicator Application NoteIncludes Sample Program and Source CodeRegards,Mike ChuProlific Technology Inc.
PL2303HX  Where to get the real deal - Page 1
Forum section: electronics / projects

author: Jester
author_rank: Frequent Contributor
timestamp: May 26, 2018, 09:55:10 am
content: I need 10, USB to RS-485 dongles for a project. The legit FTDI ones from Digi-Key are a bit steep at $25 a pop.The clones on Ebay are about $1, but use the cloned Prolific PL-2303HX chip (SSOP28) that causes no end of driver issues with Windows, so one solution might be to simply swap the cloned chip for a real one.The problem is where to purchase the legit versions, Digi-Key and Mouser don't sell them. Does FTDI or other vendor offer a drop in substitute for the PL-2303HX, if so I can add a dozen on my next Digi-Key order or if they don't, a reliable source for a legitimate PL-2303HX in a SSOP28 package?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 26, 2018, 10:25:08 am
content: I bought mine years ago on Newegg, it might not've even been them but a marketplace seller. Think it was around $10.Irony being, because it's old, it's not supported by new drivers; it's as good as counterfeit by the manufacturer. I forced the original driver version and it's fine.Ed: RS-232 dongle, that is.Tim

author: oPossum
author_rank: Super Contributor
timestamp: May 26, 2018, 10:30:14 am
content: Most of the stuff from china has switched to the CH340G. The PL2303 clones are not common anymore.For example...https://www.ebay.com/itm/132486311868Avoid these...https://www.ebay.com/itm/321636098509(RS-485 requires 3 wire to ensure common mode voltages)

author: viperidae
author_rank: Frequent Contributor
timestamp: May 28, 2018, 08:16:23 am
content: I would stay away from ftdi and prolific for good. And any other manufacturer that pulls the same kind of stunts with their drivers.

author: Siwastaja
author_rank: Super Contributor
timestamp: May 28, 2018, 08:42:00 am
content: Quote from: viperidae on May 28, 2018, 08:16:23 amWhat would you recommend, then?

author: Gyro
author_rank: Super Contributor
timestamp: May 28, 2018, 08:58:40 am
content: Go for the CH340 / CH341? At least the 'fakes' are genuine. Check the driver status though.

author: Theboel
author_rank: Frequent Contributor
timestamp: May 28, 2018, 10:36:36 am
content: Quote from: Gyro on May 28, 2018, 08:58:40 amAgree
PL5501 Usb Type-C Charger - Page 1
Forum section: electronics / projects

author: FxDev
author_rank: Regular Contributor
timestamp: December 20, 2023, 10:12:11 am
content: Hello Everyone,I want to built Usb Type-C Charger for Laptop. I'm searching IC for this and come up with PL5501.Do you have any schematics for USB Type-C charger, also I'm looking for protocol IC and found SW2303 for now.I want to get aroun 100W from 12V power supply.Thanks.
Place in Western Europe (If possible BeNeLux area) that can bond LCP to FR4 - Page 1
Forum section: electronics / projects

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: March 26, 2018, 10:05:50 am
content: Hi guys,I have a research project I'm working on that involves rigid flex PCB stackups. The in-house group can do the patterning, via drilling and etching on an LCP substrate.We have used the pure flexible structures without any rigid layers, and verified that the concept we are working on is promising. However, we now want to take it to the next step and include flip-chip dies onto the structures. In order to be able to connect these flip-chip dies we need a rigid layer (hence the FR4). We want to continue manufacturing the LCP layer inhouse for reasons I can't go into right now. So what I am looking for is a place where I could ship these flex layers that could then bond them onto FR4 substrates. We need to be able to have cutouts in the FR4 (quite large ones). We don't need any traces on the FR4, it is just their to form the rigid layers in the concept. We do need alignment of the LCP layer to the FR4 since we need the cutouts in the FR4 to match up with structures on the flex layer.Does anyone know of a place that could provide this as service? How hard is it to do this yourself, if you can get a hold on the substrates? (could I EG order cheap boards without any silkscreen and solder-mask from your run-of-the-mill supplier, and get bondlayers and manualy bond them?).I myself operate out of Leuven, Belguim. I would prefer the supplier to be local for shipping time reasons (We have about a month to do this or we miss an important paper deadline).

author: SaabFAN
author_rank: Frequent Contributor
timestamp: March 26, 2018, 02:41:05 pm
content: From how you describe it, it seems you could do it by just using some superglue or epoxy to glue an FR4-Chunk in place.If you need it only for a small number of prototypes, I see no problem with that method. Unless you have some specific requirements that cannot be met that way.

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: March 26, 2018, 03:32:58 pm
content: Quote from: SaabFAN on March 26, 2018, 02:41:05 pmThanks for your reply.I have considered this, but there are two things that worry me.The flip-chip dies will be mounted using stud-bumps made with gold, and not soldered down. These bumps are 28 um tall. As a result the substrate needs to be quite rigid and flat, and I don't know how well I can get the tolerances I need. I can play around with this and see how it goes.

author: free_electron
author_rank: Super Contributor
timestamp: March 26, 2018, 03:58:37 pm
content: contact Isola to get your hands on substrates.For the bonding you will need a multilayer press ( heated press )Try ACB circuits or Vermeulen Printservice in the netherlands (aarle-rixtel) ( the are close to eindhoven ) they may want to help you out. they love 'experimental stuff 'Any ship that can make flex boards should be able to fuse an Fr-4 stiffner. LCP is not really special.
Planar inductor as a PCB in a ferrite transformer - Page 1
Forum section: electronics / projects

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: September 24, 2018, 06:21:35 am
content: Hi,I want to put some EE ferrite cores in a Planar inductor in the PCB, for a low power (under 1W) DC/DC Converter, I want to know if you have done it before? does it have a high EMI? can I put it in my main PCB or should I separate it in a different PCB?

author: SeanB
author_rank: Super Contributor
timestamp: September 24, 2018, 08:49:13 am
content: You can, but remember that you need a good number of turns, so you want a multilayer board to get the winding space. At least a 4 layer board to get any sort of turns ratio and isolation, and have a cutout to fit the cores and the clips to hold them. You might just want to have this as separate 6 or higher layer boards and stack them together, having some plated through vias to join the layers together, a few through board larger diameter vias for the pins to hold it to the main board, and then assemble as a component, perhaps using the main PCB as one turn of the unit.
Planar Magnetic (aka Orthodynamic) Headphones - Page 1
Forum section: electronics / projects

author: olsenn
author_rank: Frequent Contributor
timestamp: November 13, 2012, 06:08:29 pm
content: Has anyone here ever tried to design a planar magnetic headphone, speaker, or similar product on a conceptual level? I recently bought my first professional pair of planar headphones (HiFiMan HE-400) and I am amazed by how awesome they sound... I would like to know how tough it would be to make one on my own (just as an educational experiment).Here's a link for those who have never heard of planar magnetic headphones:http://www.innerfidelity.com/content/how-planar-magnetic-headphones-work
Planar MD320-256-70E board - anyone has data? - Page 1
Forum section: electronics / projects

author: tkamiya
author_rank: Super Contributor
timestamp: May 17, 2019, 04:13:56 pm
content: I have two EL display board made by Plannar International Ltd. Model number s MD320-256-70E. They both came out of HP equipment but the body is no longer here and I cannot recall what they were.I know these are graphics display 320x256 but that's where my knowledge ends. Internet search didn't give me anything more. It has a 16 pin dual header with silk screen 5V 12V. They look to be a pair of very nice display board. Does anyone have anything more on these? I'd love to use them for projects.

author: wasyoungonce
author_rank: Frequent Contributor
timestamp: May 17, 2019, 11:11:39 pm
content: https://beneq.com/sites/default/files/manuals/operation_manual_el320.256-f6_and_-fd6_0.pdfOn front page of google search

author: tkamiya
author_rank: Super Contributor
timestamp: May 18, 2019, 12:24:09 am
content: Yes, I've seen this. Unfortunately, connectors are different. Namely, There are no PS1 and J2. (which really isn't a big deal) From little bit I found, suffix in model number denotes differences in I/O. Thanks for responding.

author: coromonadalix
author_rank: Super Contributor
timestamp: June 16, 2024, 05:40:43 pm
content: link expired attachedhow to test them ??just got one of theses

author: coromonadalix
author_rank: Super Contributor
timestamp: June 17, 2024, 09:39:30 pm
content: where i got it is from a HP sonet test rig, i got the motherboard todayannnndniiice