hybridfree/eevblog-posts huggingface dataset:
What power supply variabile i buy ? help me... - Page 1
Forum section: electronics / general

author: miciotta
author_rank: Newbie
timestamp: October 10, 2012, 04:45:53 pm
content: hi, i am new beginner and not expert....i what to buy a variabile power supply at 3 or 5 ampere ...what is the best ?TENMA or is best ATTEN ?https://www.eevblog.com/forum/product-reviews-photos-and-discussion/tenma-72-8345-bench-psu-review/http://www.peaktech.de/productdetail/kategorie/schaltnetzteile/produkt/p-6135.htmlhttp://www.reichelt.de/Labornetzgeraete/NSP-2050/3//index.html?ACTION=3&GROUPID=5264&ARTICLE=87321&SHOW=1&START=0&OFFSET=16&&SID=11UHRpR38AAAIAABAM4Oc7d71deb6c8a30ba45907bc68a41496a9&LANGUAGE=ENhelp me.... i buy Temna orATTEN0-30 V at 5 ampereATTEN APS3005Sis good or bad ?thank and kissMery

author: LaurenceW
author_rank: Frequent Contributor
timestamp: October 10, 2012, 07:37:43 pm
content: miciotta,These two supplies look to be THE SAME THING but with a different badge on the front? This is very common in these types of products. Buy whichever one you can get BACKUP for, if something goes wrong.PS - don't blow me kisses - we've only just met

author: miciotta
author_rank: Newbie
timestamp: October 11, 2012, 06:31:14 pm
content: yes... is the same power supply !!!MANSON or PeakTech or Tenma is the same !!!! hi hiis a nice power suplly ? work well or is not god ?i buy it or ? is best the 3 amere or the 5 ampere version ?help me... what i buy ?kiss mery

author: LaurenceW
author_rank: Frequent Contributor
timestamp: October 11, 2012, 07:45:01 pm
content: Miciotta,You need to tell us a bit more about what you want to use the power supply for.> If you are into high quality audio or small signal analogue stuff, a SWITCHED MODE Power Supply like this could be a DISASTER.> If you want something to control thumping stepping motors, you might NEED that 5A.> If you are driving small digital products, a 3A SMPS may be quite adequateI think Mike's Electric Stuff did a tear down of one of these - it didn't do too badly (he couldn't resist tinkering!)

author: miciotta
author_rank: Newbie
timestamp: October 12, 2012, 04:54:49 pm
content: hi...I found that :TENMA 72-8345 = MANSON 2050 = PEAKTECH P6095Is the same power supply !Now, is a best buy ? I not use for work but only for hobby…I buy this power supply ?Thanks , Mery.P.S. I see there is a modify for this (by Mike) ? what is this modAnd for what ?

author: poorchava
author_rank: Super Contributor
timestamp: October 15, 2012, 10:51:30 am
content: They are not necessarily the same. They are often rebadged, but it may happen that for example power transistors are cheaper in one of those than the other, or that when factory was making these for particular customer they were asked not to place some protective circuitry to save a huge $0.17789.
QJE 15V 30A Adj Switch mode Power supply! Surprise parts inside - Page 1
Forum section: electronics / general

author: junggwok
author_rank: Contributor
timestamp: October 24, 2012, 10:58:17 am
content: I bought this cheap power supply when I was China last week. Because I need high power supply for my audio amp project, my Array 3645A Programmable (3A) power supply just cannot supply enough current or my 5Amp Manson linear supply. I thought I open it and see what's inside. I actually quite by the parts used inside. Two massive Rubycon 200v 680uF Electrolytic Capacitors. I thought really, because I only paid $55 Australian dollars for this, granted the voltage is only adjustable from 9v to 15v but that's all I needed. I actually managed to trim it down to 6v, simply hack, now the supply is adjustable from 5.9V to 15.3V. Will test the 30A power rating with my electronic load. I will let you guys know how it performs under full load.

author: bingo600
author_rank: Super Contributor
timestamp: October 24, 2012, 07:15:39 pm
content: Lets not hope that,the PSU was to cheap .....https://www.eevblog.com/forum/projects-designs-and-technical-stuff/warning-fake-large-electrolytic-on-ebay-!!//Bingo

author: mariush
author_rank: Super Contributor
timestamp: October 24, 2012, 07:52:10 pm
content: Even if they were real, the last accepted order for that series was inSeptember 1999. USP is a discontinued series,85C standard, not 105c as the label says, so it's probably fake.See page 9 on their document:http://www.rubycon.co.jp/de/catalog/e_pdfs/aluminum/CautionAlumi_Eng.pdfps. check the voltage rating of that small capacitor by the banana jacks... if it's 16v replace it with a 25v one at least, 15v max voltage is awful close to 16v and you don't know how much ripple this will do.I doubt it can do 30 A, it will probably burn up at 10-12A, and the cables don't seem thick enough to do 30A.ps2. bingo probably wanted to link to this page, his link is bad:https://www.eevblog.com/forum/projects-designs-and-technical-stuff/warning-fake-large-electrolytic-on-ebay-!!/45/

author: robrenz
author_rank: Super Contributor
timestamp: October 24, 2012, 08:02:51 pm
content: Scrollwaydown on this page to figure 38 and 39 to see what is in some caps. I hope this is not what is in yours. if you have a capacitance meter it would be interesting to see what the capacitance is.http://www.turtlesarehere.com/html/cd_welder.html

author: T4P
author_rank: Super Contributor
timestamp: October 25, 2012, 07:56:37 am
content: Don't forget ESR. The most important thing

author: Rerouter
author_rank: Super Contributor
timestamp: October 25, 2012, 10:37:05 am
content: the fact it was reading so low, as stupid as it sounds, where where you measuring the voltage? at 30A your talking serious voltage drops even if only from the pcb to the front connectors,
siglent's new product:SHS800 handheld oscilloscope - Page 1
Forum section: electronics / general

author: electric_man
author_rank: Newbie
timestamp: September 17, 2012, 05:37:46 am
content: HTTP://www.mortoncontrols.com/blog/files/category-oscilloscopes.htmlIn this blog, the first time I saw the SHS800 handheld oscilloscope. And then I went the Siglent’s official website:http://www.siglent.com/en/index.aspxfor more information. Exactly, you can download the SHS800's user manual in the download center, what's impossible in the past.What really interesting me is the Recording function. I think mostly cheap handheld oscilloscope have not this function.Composed of three specific features: Scope Trend Plot, Scope Recorder and Meter Trend PlotScope Trend Plot:The Trend Plot of Vpp and frequency in picture. All the auto measurement (32 types) can be recorded.Scope Recorder:Record the waveform of slow signal for a long time, support the U disk storage.Meter Trend Plot:Record the values of DMM's Parameter(voltage, current, capacitance and resistance).

author: Dread
author_rank: Regular Contributor
timestamp: September 27, 2012, 09:46:26 am
content: Nice looking scope, I would love to see Dave or mike run it through some tests.

author: Jimmy the Squid
author_rank: Regular Contributor
timestamp: September 27, 2012, 05:46:20 pm
content: That does look fancy. I'm curious about how it stacks up too. Could this be the mysterious missing link - a hand held scope that attempts to get the little things right?I would think that the price point will be too high, though I was not able to find an msrp.

author: T4P
author_rank: Super Contributor
timestamp: September 27, 2012, 06:34:28 pm
content: Quote from: Jimmy the Squid on September 27, 2012, 05:46:20 pmDoubt it will be much lower than Hantek's DSO1202S and of course, siglent's not really any good in quality compared to hantek or tekway whatever

author: Achilles
author_rank: Regular Contributor
timestamp: October 03, 2012, 08:35:11 pm
content: well, it is in the price-range of the Hantek DSO1202B (depends on the source where you get it).....About the Quality...let's see. I have a Hantek DSO1202B which is pretty nice for the price I paid and serves me quite well when I need a scope somewhere. One thing that I dislike about it is the housing. It doesn't feel that rugged and the Display gets scratched really easy. Even so, the Hantek is big and has the ergonomic layout of a brick.So the rounder Siglent case could clearly get a price in terms of ergonomy compared to the Hantek. I am pretty curious about the SHS1000 Series when it will be widely available and prices will lower. That's the SHS800 with isolated channels. So that would more compare to the Hantek DSO1xxxS Series.@T4P: Is the Hantek S series available now? I bought my B series this spring and the launch of the S Series wasn't really clear then.

author: T4P
author_rank: Super Contributor
timestamp: October 03, 2012, 08:49:44 pm
content: Yeah, S is a recent model. 2M of sample memoryIt is indeed a brick but hey,Brick.
Help - Calibrating a Sears Analog VOM [ 9 460.5205 ]  - Page 1
Forum section: electronics / general

author: Amarbir[Lynx-India]
author_rank: Frequent Contributor
timestamp: September 24, 2012, 03:56:06 pm
content: Hello All ,I Am Restoring And Trying to calibrate This Multimeter Today ,Have 2 Units Hence Made My work a little easy + the schematics were there too .Please Have a look At this VOMThe Sears 460.5205 41 Ranges VOMThe Inside Of This VOMThe Calibration Pots InsideThe Schematic Of The SameLink To Larger Photo - >http://i49.tinypic.com/rwt109.jpgWhat i Would Like To Do is that i would like to calibrate the same ,But i am very confused ,For DC Volts I Have No Idea if VR2 is required to be tweaked or VR3 .For DC Amperes i Think Its The Calibration Resistor R9 Currently At 33.16 .VR5 is the Resistance Zeroing .Would Like To Know What Pot To Touch If i Need To Calibrate The Same .No Idea What VR1 And VR4 Would Be Doing .I Will Also Upload A Chart Of Identifying Components So That Future People Could Refer To This Thread .Meter is 18 Micro Amperes FSD .

author: Nirios
author_rank: Regular Contributor
timestamp: September 24, 2012, 08:45:39 pm
content: The insides look very similar to a Micronta 22-204C I was working on the other day.The only calibration steps I was able to find was:To adjust the unit,VR1 use 30ma dc on 30 ma dc rangeVR2 use 100 vdc on 100vdc rangeVR3 use 100vac on 100 vac rangeVR4 zero adustSource:http://www.antiqueradios.com/forums/viewtopic.php?t=109459I have not used the above method since my unit has fried (and I mean burnt black) resistors in the ohms section. I think someone measured mains voltage while on the ohms setting.

author: Amarbir[Lynx-India]
author_rank: Frequent Contributor
timestamp: September 25, 2012, 07:47:33 am
content: Quote from: Nirios on September 24, 2012, 08:45:39 pmWell,i have those too lol they will be operated upon later on .BTW the circuit does indeed look the same .Think they were all made by the same people in korea ,beautiful multimeters .I also got a reply from some here ->http://antiqueradios.com/forums/viewtopic.php?f=8&t=204594
High-power high thermal horsepower stations : Part2  - Page 1
Forum section: electronics / general

author: T4P
author_rank: Super Contributor
timestamp: September 23, 2012, 11:03:59 pm
content: PACE HW-100 vs FX-951I went back to the place where i bought my lodestar 8202 for 100 bucks and i found a used HW-100 for 100 bucksAnd a used FX-951 for 150 bucks (Brand new goes for like 550$)Which one do you reckon is better?I think the FX-951 is better for the massive ranges of tips, but do you think so?And i also found a used Hakko FR-803 for 200bucks ... WOW (Brand new they go for like 2100$) so i'm picking that up at the end of the yearIt might have had a hard time elsewhere but it's definitely going to live on in my lab
DLO Power Bug USB charger  - Page 1
Forum section: electronics / general

author: reagle
author_rank: Unknown
timestamp: September 22, 2012, 11:29:26 pm
content: Just did a quick teardown /troubleshooting of a DLO Power Bug USB charger athttp://kuzyatech.com/dlo-power-bug-troubleshootingDoes anybody know why they stuck that second series diode between the rectifier and the USB connector? It would seem that they could've dialed down the output in the first place, so its probably not to drop extra voltage

author: amyk
author_rank: Super Contributor
timestamp: September 23, 2012, 09:31:05 am
content: E243633 gives the OEM as "PINE-TUM ENTERPRISE CO LTD" in Taiwan, although a quick Google reveals the company may have moved to China too.The use of an SMPS IC is rather unusual in a wallwart of this power and origin; much more common (and cheaper) is the 2-transistor RCC. It's probably due to the design constraints of having that LED in the center --- moving it closer to the edge would've given more space on the primary.Mike can probably say more about whether the creepage distances are sufficient.

author: T4P
author_rank: Super Contributor
timestamp: September 23, 2012, 12:28:26 pm
content: i spot isolation slots, well you know what we do with crappy SMPSs
Identify this connector please? - Page 1
Forum section: electronics / general

author: btfdev
author_rank: Contributor
timestamp: September 19, 2012, 05:41:16 pm
content: This is one tiny 2 wire connector, anyone know the make and part number perhaps?http://www.binarytaskforce.com/photo-id-TWlzY19QdWJsaWMsMjAxMi0wOS0xOV8xMi0zMi0xM185NTcuanBnhttp://www.binarytaskforce.com/photo-id-TWlzY19QdWJsaWMsMjAxMi0wOS0xOV8xMi0zMy0wMF8yMzEuanBnThanks in advanceTeam BTF

author: Unknown
author_rank: Unknown
timestamp: September 22, 2012, 01:09:51 pm
content: If it's this:http://ciclofficina.homelinux.org/product/1/773/A-Pair-Of-Molex-51021-2-Pin-Female-And-Male-Connector-For-Mcx-Batteries.htmlis a molex

author: notsob
author_rank: Frequent Contributor
timestamp: September 22, 2012, 01:32:59 pm
content: have a look at molex picoblade or possible Japenese Solderless Terminals (JST) -http://www.jst.com/home20.html

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: September 22, 2012, 03:54:07 pm
content: Looks like JST XH (2.5mm) or PH (2mm) though I'm not sure JST actually make the male-pin inline version, although they are compatible with the JST female housings.
Help!  Review:  Protek 3120 & GW Instek 1152A - Page 1
Forum section: electronics / general

author: blueboy
author_rank: Newbie
timestamp: May 25, 2011, 04:07:58 am
content: Hello guys,I'm new here...I want to buy a scope for my home lab...I have done some research...But I cant decide between these 2 scopes listed below.I am hoping someone here could help me decide which scope to get. (with 999$ us)Here are the 2 scopes :PROTEK 3120( 200MHZ, 1Gs/s, 7inch LCD, Made in Korea )Code:http://www.testequipmentdepot.com/protek/oscilloscopes/3120.htmGW Instek GDS-1152A( 150MHZ, 1Gs/s, 5.6inch LCD, Made in Taiwan )Code:http://www.testequipmentdepot.com/instek/oscilloscopes/gds-1152a.htm

author: Bored@Work
author_rank: Super Contributor
timestamp: May 25, 2011, 05:15:43 am
content: This Protek looks suspiciously like a Hantek/Tekway. Protek does a lot of badge-engineering, so this isn't surprising.The GDS-1152A was reviewed by someone in this PDFhttp://welecw2000a.sourceforge.net/docs/Hardware/GW_Instek_GDS-1152A.pdf

author: Mechatrommer
author_rank: Super Contributor
timestamp: May 25, 2011, 09:39:28 am
content: for $999, i dont have a taste/suggestion on 1Gs/s, i'll try to push if i can get any 2Gs/s scope.http://cgi.ebay.com.my/New-Owon-PDS8202T-2Ch-200MHz-Oscilloscope-2GS-s-2M-pts-/280646870851?pt=BI_Oscilloscopes&hash=item4157db6743sorry offtopic and will need more study on this.

author: saturation
author_rank: Super Contributor
timestamp: May 25, 2011, 11:11:33 am
content: The Instek, IMHO, is the least risky. They have better support and build quality, they've been in business since the 1970s as Good Will brand.

author: johnboxall
author_rank: Unknown
timestamp: September 19, 2012, 09:16:01 am
content: Quote from: blueboy on May 25, 2011, 04:07:58 amif you decide to go with the Protek, it's too expensive. Pretty sure that's a Hantek DSO5202B - if so a dealer here was selling it during Electronex last week for $445 ex-GST.

author: T4P
author_rank: Super Contributor
timestamp: September 19, 2012, 10:20:07 am
content: GW Instek scopes are built like a tankand Protek is NOT protek, it's a hantek made in korea my arse

author: Joy at MCS
author_rank: Regular Contributor
timestamp: September 19, 2012, 11:30:58 am
content: I wouldn't say the Instek scopes are built like a tank. They do make decent scopes though.Hantek does not make the scopes for Protek.Have a good day everyone :-)Joy

author: Nirios
author_rank: Regular Contributor
timestamp: September 19, 2012, 02:54:29 pm
content: I do not have the 150 Mhz version, but I do own a GDS-1102A-U (100 Mhz)I would not say its built like a tank, but it does have a metal shell and feels quite sturdy. Does not feel at all like cheap Chinese junk.Support has been good. I came across a bug in capturing data via the USB port onto a flash drive. A few emails later, I had the latest firmware version and easy instructions on how to upgrade. Bug was fixed.If you have any questions about this model, I'll provide pictures or try to answer them the best I can.
Easywave of Siglent (SDG1025) - Page 1
Forum section: electronics / general

author: Malama
author_rank: Newbie
timestamp: September 17, 2012, 01:11:15 pm
content: Hello,Is somebody uses Siglent Easywave software. It should build waveforms for signal generator.This software is available on CD Rom and delivered with my Siglent SDG1025.The version is : V100R001B01D01P09 (1.1.1.7) setup file dated May, 21 2012No problem during SW installation on computer, but when launch it :- Message box : "visa32.dll missing"> install of visa32.dll- new message box : "agvisa32.dll missing"> install of agvisa32.dll (find on Agilent FTP)- new message box : "Procedue input point not find in agvisa32.dll (lookupMsg@@GPADJ@Z)">?I uninstalled this Easywave version and installed old version (1.0) V100R001B01D01P03R2,Setup file dated Sept, 05 2011.This one can be launch without problem, but it is not possible to save waveforms, neither to send waveform to the device via USB port :- Message box : "Please connect the device with USB first"then USB driver is correctly installed and USB device connected first.Do you have some idea ?Thanks, JC

author: Bored@Work
author_rank: Super Contributor
timestamp: September 17, 2012, 04:27:11 pm
content: Sounds like you should install a VISA runtime, either from NI or Agilent.

author: Malama
author_rank: Newbie
timestamp: September 17, 2012, 10:07:25 pm
content: Thank you !I install Visa runtime (V5.2 recommanded) from NI.Caution : Visa runtime must be install before EasyWave.Now :- Easywave (V 1.7) can be launched.- I can send a waveform to the SDG1025 as far as the file name is WaveX.Nevertheless, it is not possible to save file waveform elsewhere "My documents" folder.When I try to other folder : "save file" window disappears. BugVery basic Sw

author: Malama
author_rank: Newbie
timestamp: September 18, 2012, 08:32:41 am
content: QuoteRectification !!>False: Only file name does not include symbols as dash ...
Identify this 2.5mm connector please? - Page 1
Forum section: electronics / general

author: btfdev
author_rank: Contributor
timestamp: September 13, 2012, 03:50:51 am
content: Hello folksBase on initial inspection, this photo shows a 2.5mm connectorhttp://www.binarytaskforce.com/photo-id-UG9seWNvbS1Tb3VuZFN0YXRpb24yLDIwMTItMDktMTFfMTMtMjItNTNfNjIyLmpwZw==that has:- 6 contacts in total (Looks like the ground has 2 contacts)- 1 contact on each side- 2 contacts at the backSo could this be a 2.5mm TRRS connector?Entire photo album can be found here:http://www.binarytaskforce.com/photocontact-album-9CheersTeam BTF

author: Psi
author_rank: Super Contributor
timestamp: September 13, 2012, 04:08:20 am
content: Design is similar to thishttp://www.digikey.co.nz/product-detail/en/SJ1-42536-SMT/CP1-42536SJCT-ND/659937I'd say its made by 'CUI inc' but a slightly different model.
Remote control contents - Page 1
Forum section: electronics / general

author: Wim_L
author_rank: Regular Contributor
timestamp: September 15, 2012, 10:18:00 pm
content: Disassembled a remote control today, and I figured I'd post some pictures.It's from an audio system, and it needed cleaning after battery leakage. Disassembly did not go all that smoothly. 6 plastic hooks kept the case together firmly, and the two in the middle of each side of the case did not survive the process. Still, even with just the corner clips remaining, it holds together very well. Clearly not intended to be maintenance friendly though.Finally, the board... Not that many surprises, mostly the soft rubber buttons, with one slider. Battery contacts are soldered directly onto the board, and when inserted into the case a plastic divider makes sure they cannot be shorted together. Most of the functionality is handled by a single chip with a few passive components. The other side of the board is almost empty (forgot to take a picture of that), except for a few through-hole parts. Especially noticeable is a small electrolytic across the battery terminals, apparently without protection against incorrect battery polarity, probably because the case design would take care of that (Looks like the flat side of a battery would not be able to contact the positive input).

author: SeanB
author_rank: Super Contributor
timestamp: September 16, 2012, 05:21:09 am
content: Old unit that, using Dave's favourite MELF resistors....... Most of these can be improved by using a bigger capacitor in place of the one used, provided you can get it in the space. I have seen them with a 1uF 50V unit, and after replacing with a 100uF 6.3V one the range and battery life was much improved. Most though use a 22uF unit, going up to 47uF does make a difference.

author: amyk
author_rank: Super Contributor
timestamp: September 16, 2012, 11:17:56 am
content: It uses a4-bit mask ROM microcontroller(datasheet link) from the late 80s, probably a time when dedicated IR encoder chips hadn't become popular yet.
Marksman Electronic Tester Teardown/Schematic/Help wanted - Page 1
Forum section: electronics / general

author: stevenhoneyman
author_rank: Regular Contributor
timestamp: September 13, 2012, 12:04:57 pm
content: I recently bought a cheapo voltage detector, which was supposed to have high and low sensitivity for the non-contact range. Unfortunately I took it apart and found the switch to have its pins soldered together meaning both selections do exactly the same thing!I drew the schematic out (it uses a 4069 and a couple of transistors, nothing fancy):http://www.stevenhoneyman.co.uk/2012/09/marksman-electronic-tester-teardown.htmlIf I cut the PCB trace on the switch, I was wondering if someone could help me with what I could add to provide the sensitivity adjustment. I'm sure it's probably just a resistor or diode or something that I could solder in. The trace that's cuttable to provide the selection would currently connect/disconnect Diode D3. If I do disconnect this, the input floats so you touch it once and it stays beeping for ages then fades away.

author: sotos
author_rank: Frequent Contributor
timestamp: September 13, 2012, 06:54:55 pm
content: My friend that’s dangerous things, you trust you’re life in that. Go buy from a known manufacturer a fully trusted detector. They don’t cost a fortune.

author: stevenhoneyman
author_rank: Regular Contributor
timestamp: September 13, 2012, 06:59:05 pm
content: Don't worry, I'm not trusting anyone's life to this - got a Fluke VoltAlert which I use. Even still, a non-contact detector I still only trust as a quick indicator, and I would always test anything properly regardless.
Requesting suggestion, new rotatory encoders for DS1052E - Page 1
Forum section: electronics / general

author: DarkPrince
author_rank: Regular Contributor
timestamp: September 13, 2012, 06:33:16 pm
content: There is a few threads on the actual technique about replacing them. Rather, I was wondering if you had a suggestion on the approach. I'd like not to loose my scope for too long, especially since I just got my new/first Arb. Waveform Generator and would kinda suck to not have a scope to mess with it. Suppose I should just replace the encoder (time base one)? I bought it from Saelig, and if they hold to their three year warranty, I still have a year left on the clock (bought in 2010, can't believe it). I mean it still -mostly- works, if I am very careful I can get it to go +timebase...I think I am tempted to just open it up... I mean I am an engineer... even with Dave's videos I have the desire to take it apart.Anyway, just curious of other ideas of approach.
Troubleshooting super old HP 6203B linear power supply. - Page 1
Forum section: electronics / general

author: ftransform
author_rank: Frequent Contributor
timestamp: September 10, 2012, 03:07:00 pm
content: So I got this old linear power supply on ebay a while back. It has worked well for me but it has recently broken.I have possibly broken it due to stupidity. I shorted out the leads several times in succession in order to watch the indicator needle dance around after a beer (analog gauges amuse me!). Anyhow the next day I noticed that the power supply was acting a bit funny.It used to go up to about 9.5 volts (even though it is rated at 7.5V), now it goes up to maybe 7.95 volts. Also prior to this incident when you turned the current adjust knob all the way down while it was set to voltage indication mode the needle would sharply drop to 0, now it slowly drops down to 0.Another issue is that previously you could set to current knob to like 10mA and the voltage could be raised to 9V. Now you need to set the current knob to like 1 amp before the voltage can reach to its new ~8v maximum.Furthermore when the meter is set to current mode it shows a small current even when the knobs are turned down, I don't think it used to do this. This leads me to believe that something is shorted?I have looked at the manual some and taken the instrument apart but I am a bit intimidated. The only thing I have measured so far is the turn pots, and I have noticed a discrepancy between the two knobs, labeled as identical parts in the manual. Using my radio shack digital multimeter I found that the resistance across one pot like 1.45kohms and the resistance across the other pot starts at 1.45kohms but slowly rises to ~1.58 kohms. I'm pretty sure you are not supposed to measure resistance in circuit so I am not sure if this is significant.. I don't really understand why the resistance slowly changes.Anyway before I start desoldering pots and transistors and all that I thought I'd ask because people on this forum have a ton of experience and maybe I can be pinpointed to the possible issue.Again I'm not sure if shorting the power supply out 10 times caused it to fail... I figured it would be built to withstand that kind of thing but it is ancient after all.All the metal is heavily oxidized but the solder joints look great.Here is the manual for reference:http://cp.literature.agilent.com/litweb/pdf/06203-90001.pdf

author: qno
author_rank: Frequent Contributor
timestamp: September 11, 2012, 02:28:17 pm
content: Hi,You are right, this should not have killed the power supply.There is a trouble shooting procedure in the manual.Maybe try the calibration procedure first. There you will be pointed to the problem.There are lots of forums that discuss repairing old HP equipment.I have a 6253A that has never failed me. Only the potmeters get a little crackly. I have to twist the knob a few times to adjust the voltage or current in detail.
About Magnifying lamps - Page 1
Forum section: electronics / general

author: T4P
author_rank: Super Contributor
timestamp: September 08, 2012, 06:51:07 pm
content: Hi guys, so what diopter do you go go for?I'm wondering how short distance you would only have with 10 diopter so i'm thinking 8?

author: nctnico
author_rank: Super Contributor
timestamp: September 08, 2012, 10:09:56 pm
content: I have such a lamp with an 8 diopter lens. Just a few hours ago I used it to check a PCB I just etched. It is excellent value for money but if I could spend a lot more money I'd rather have a 6x stereo microscope on a boom or a Mantiss (but now I start drooling quite badly)

author: T4P
author_rank: Super Contributor
timestamp: September 09, 2012, 04:54:20 am
content: Luckily for me a Onehunglow with a great white lens cost about 20USD not including shipping
Hakko 851 hot air station - Page 1
Forum section: electronics / general

author: billclay
author_rank: Regular Contributor
timestamp: September 06, 2012, 04:29:24 pm
content: Just wondering if anyone has/uses a Hakko 851 and can offer an opinion of it? I'm considering purchasing one for SMT work.Thanks

author: T4P
author_rank: Super Contributor
timestamp: September 06, 2012, 05:04:53 pm
content: These rework pens are a great alternative to hot air wands. Those are really guns.But frankly IMHO, hakko is making them VERY expensive...So instead of buying hakko i changed my mind into buying that "SOME OTHER BRAND" that makes their own. (90W iron and 180W rework pen for 200bucks! If you dare to buy direct from china using a agent ...)and also this :http://www.head-fi.org/t/416001/reviews-some-people-collect-amps-i-collect-soldering-stations/45#post_6084493And xytronics, but theirs is a little bulky
CYBER 936 Soldering Station (Hakko Clone) Teardown - Page 1
Forum section: electronics / general

author: sdttn
author_rank: Contributor
timestamp: September 04, 2012, 03:36:55 pm
content: I got it for 26$ at local dealer.

author: T4P
author_rank: Super Contributor
timestamp: September 04, 2012, 04:14:17 pm
content: Great find! Never saw a black one with a PS/2 socket before OR a front mounted switchThe socket is a real joke ...Here's mine with a front mounted switch

author: amyk
author_rank: Super Contributor
timestamp: September 05, 2012, 08:29:55 am
content: The name on the PCB suggests it's a rebrand of the Lukey 936A. The circuit looks like the standard one with a triac and dual comparator, but the connector might be a bit weak for the rated wattage (40W? 30W?) although they may be paralleling pins for higher ampacity. The heater appears to be ceramic type.

author: GK
author_rank: Super Contributor
timestamp: September 05, 2012, 09:12:18 am
content: Those "Microphone" plugs/sockets are actually rated at 10A/32VDC. I've used them in a number of applications (including harsh conditions) for several amps of current and have never encountered any problems. As far as soldering irons go, they are a nice / cheap conversion for those crappy DIN connectors on old Weller stations.

author: sdttn
author_rank: Contributor
timestamp: September 05, 2012, 09:25:31 am
content: I noticed today, that there is keyboard sign on the socket.

author: GK
author_rank: Super Contributor
timestamp: September 05, 2012, 09:34:48 am
content: Oops, sorry, I was refering to the plug on T4P's unit. Yours has a crappy DIN connector, just like my brand new and stylish (not overly cheap either) Hakko soldering station at work, as well as all of our old and horrible Weller units.The factory DIN connectors never lasted the life of the old Weller units, so it's annoying to see them still being used as some kind of standard ~20 years later in new "premium" products.

author: T4P
author_rank: Super Contributor
timestamp: September 05, 2012, 03:12:58 pm
content: Me i just prefer the DIN-5 connector on the clones ...I'm waiting for them to use XLR sockets
New Saleae Logic/Logic16 Software - Page 1
Forum section: electronics / general

author: olsenn
author_rank: Frequent Contributor
timestamp: September 04, 2012, 05:27:02 pm
content: I just thought I'd mention that there is now a new beta (1.1.16) available for Saleae Logic Analyzers that includes native 64-bit Windows support as well as several new analyzers (such as JTAG, Atmel DebugWire, PS/2 Keyboard + Mouse, and LIN).Fow anyone who has one, the software can be found here:http://community.saleae.com/saleae_frontpage(you'll need an account)
Lectrosonics M175-LS VHF Mic Transmitter Teardown - Page 1
Forum section: electronics / general

author: FenderBender
author_rank: Super Contributor
timestamp: September 04, 2012, 03:58:52 pm
content: I'm in the marching band at my school. Don't laugh we're actually pretty good...If you're curious:Anyway,Our director uses a bullhorn system for practice. Two bullhorns hooked up to a wireless mic. Well the mute switch on his transmitter broke the other day. The bat/actuator just broke off...so I volunteered to fix it.It's not anything special, but if you were curious... Build quality is pretty good. I'd say you would call it "professional-grade" if such a grade existed. Not consumer crap, but not NASA grade. Lots of RF magic going on in here. Very precise crystal as you can see. 8 significant figures.The big chip on board is an ON SA571D which is a compandor, a device which I had never heard of before, but is apparently widely used in RF transmission. Curiously, there is another footprint for another SOIC-16 package on the board, but as far as I can tell there are no better variants to the M175 so I don't know what it would be used for.Anyhow, comes in a nice machined Aluminum case. The 9V battery system is solid. Can't put it in the wrong way either.Seems like the original retail price for it was around $350USD. However, most of the places I looked have it for about $250. Still not cheap! But I guess that's the price you pay for a low-ish volume product that's reasonably good quality.M175 Datasheet:http://www.lectrosonics.com/images/TD-sheets/m175td.pdfSA571 Datasheet:http://www.onsemi.com/pub_link/Collateral/SA571-D.PDF
Kindle Touch audio hissing - all the time - Page 1
Forum section: electronics / general

author: madworm
author_rank: Frequent Contributor
timestamp: September 02, 2012, 12:01:02 am
content: It seems that even after turning off the mp3-player or text-to-speach the audio-chip isn't turned off completely. There is a constant hiss coming out of the speakers. Not too loud, but it runs the batteries down much quicker than it should. I did a bit of testing and sometimes (rarely) the hissing goes away when turning the mp3-player off. And after a device-restart it is also silent.Anybody with a Kindle Touch out there who could verify this?

author: Rerouter
author_rank: Super Contributor
timestamp: September 02, 2012, 12:12:30 am
content: i have one and can confirm the speakers are normally dead silent,

author: amyk
author_rank: Super Contributor
timestamp: September 02, 2012, 10:14:11 am
content: Likely a software/firmware issue that it's not turned off, but I'm a little surprised to hear that it hisses - even the cheapest Chinese MP3 players these days don't hiss when on, unless set at close to maximum volume.
Axiomet multimeters ... who are they? - Page 1
Forum section: electronics / general

author: remy_m
author_rank: Newbie
timestamp: October 02, 2012, 08:32:14 pm
content: I found this brand of multimeters onhttp://www.tme.eu/en/katalog/#search=axiomet&s_field=accuracy&s_order=DESCand was wondering if anyone has more info about them.Axiomet AX-178MASTECH MS8218The do quite look alikeCheers!

author: muvideo
author_rank: Frequent Contributor
timestamp: October 02, 2012, 09:00:26 pm
content: Better resemblance:From herehttp://www.mastech.com.cn/html/en/products-va38.htmFabio.

author: twbranch
author_rank: Contributor
timestamp: October 07, 2012, 01:09:12 am
content: Mastech makes a lot of MMs. I have a Harbor Freight MM. Open the back it has Mastech sticker on it.

author: remy_m
author_rank: Newbie
timestamp: October 08, 2012, 06:58:31 pm
content: So they are just a Mastech re-brand as I understand.

author: Bored@Work
author_rank: Super Contributor
timestamp: October 08, 2012, 08:14:21 pm
content: Quote from: remy_m on October 08, 2012, 06:58:31 pmNo. There is the real Mastech, aka Precision Mastech. And there is V&A. This Axiomet is from V&A.And V&A aren't the real Mastech. V&A just happens to use the mastech.com.cn domain. Although they aren't Mastech. Mastech useswww.p-mastech.com
RIGOL DS1052E - First Time - Page 1
Forum section: electronics / general

author: gsmicro
author_rank: Newbie
timestamp: August 26, 2012, 06:53:10 am
content: I purchased a new RIGOL DS1052E.Firmware version = 3.02For the time being I just checking the system whether it has bugs or not.Upto now I didn't get any bugs.common bugs I checked*Checked rising/falling edge in the trigger menu - worked fine*Changed couplings to DC in CH2 & measured - worked fine.(never switches to AC coupling like in some earlier versions)*In "measure" menu "display all" items working fine without flickeringI need some other bugs to check whether I have them.I also have UNI-T 2052CEL oscilloscope.If anybody needs some product review I can help.

author: electric_man
author_rank: Newbie
timestamp: August 27, 2012, 07:12:39 am
content: UNI-T 2052CEL??I had saw 2012 product manual of UNI-T.In the product manual,UTD2052CEL have the waveform acquisition rate >=2000wfms/s.It's really?Maybe UNI-T don't write this specification is better.what's worse,the waveform acquisition rate of UTD2000CM series >=150000wfms/s.what they say only a joke!a joke like this:No matter you(the customer) believe or not to believe, I(UNI-T) believed.

author: mianchen
author_rank: Regular Contributor
timestamp: August 27, 2012, 08:25:22 am
content: Quote from: electric_man on August 27, 2012, 07:12:39 amhuh?

author: T4P
author_rank: Super Contributor
timestamp: August 27, 2012, 08:49:19 am
content: I simply don't understand what electricman is saying. It's totally incomprehensible

author: electric_man
author_rank: Newbie
timestamp: August 27, 2012, 09:24:32 am
content: Quote from: T4P on August 27, 2012, 08:49:19 amUTD2000CM:above 150000wfms/s waveform acquisition rate.Do you believe it ?

author: T4P
author_rank: Super Contributor
timestamp: August 27, 2012, 11:07:37 am
content: A company like UNI-T, no.I have posted about it before and ... somebody here actually wants to believe it
Radiation detector teardown - Page 1
Forum section: electronics / general

author: SeanB
author_rank: Super Contributor
timestamp: July 08, 2012, 05:22:33 pm
content: Finally found a radiation monitor. Seems to be working, around 6 pp min in my room. Will look tomorrow for that old smoke detector to do a total tear down and rip apart to get the tiny source out of it as a better test subject.

author: SeanB
author_rank: Super Contributor
timestamp: July 09, 2012, 05:17:04 pm
content: Looked in the garage, and found the pack of 50 gas mantles. Much better source, Strontium goodness there....... Very active up close, around 200ppm with the meter against the pack. Lot of Alpha particles with bare mantles, but with the mantles wrapped in 3 plastic sheets they are gone, only the low level gamma left to see. About double the background level.

author: bsgd
author_rank: Regular Contributor
timestamp: July 09, 2012, 07:15:02 pm
content: Is that a mica window geiger tube?

author: SeanB
author_rank: Super Contributor
timestamp: July 09, 2012, 07:27:35 pm
content: Seems to be, at least it is reasonably transparent to alpha particles.

author: HardBoot
author_rank: Regular Contributor
timestamp: July 09, 2012, 07:35:23 pm
content: Portable beta/gamma metres are one of the more interesting things you could ever DIY, electrically they're very simple, only hard part is getting a detector, got mine from a dead Russian unit.Sadly I tossed mine after it cooked itself, was entirely made from scrap.

author: bsgd
author_rank: Regular Contributor
timestamp: July 09, 2012, 07:39:48 pm
content: Too bad after the Fukushima accident prices for geiger tubes went crazy.I always wanted to make myself one of this, but now a mica window pancake tube costs 150 USD!

author: westfw
author_rank: Super Contributor
timestamp: July 10, 2012, 06:17:11 am
content: QuoteThorium!

author: SeanB
author_rank: Super Contributor
timestamp: July 10, 2012, 03:55:53 pm
content: Could be, they are pretty close together as rare earth oxides. Not likely that a mantle maker would use a pure oxide, if they did any refining other than remove the bigger rocks before grinding I would be surprised.

author: westfw
author_rank: Super Contributor
timestamp: August 31, 2012, 01:08:38 am
content: (sorry for the delayed response)Strontium is not a "rare earth", apparently doesn't have useful emissive properties, and ... wouldn't be radioactive. (Although Strontium-90 is a famous and highly radioactive product of fission reactions (and thus a component of radioactive waste from reactors and fallout from bombs), there are several stable isotopes of Strontium, and the non-radioactive forms are common and widely used. (Every Independence day there is some anti-fireworks crusader with the science education of a grade-schooler who will get articles published claiming that fireworks have radioactive fallout, (presumably due to the strontium.) It's a bit of pet-peeve.))
NOOK Simple Touch™ (Kindle like E-Book Reader) - Page 1
Forum section: electronics / general

author: Unknown
author_rank: Unknown
timestamp: August 20, 2012, 04:06:52 pm
content: Not sure if it's any good; anyone tried one?http://www.barnesandnoble.com/p/nook-simple-touch-barnes-noble/1102344735

author: aluck
author_rank: Regular Contributor
timestamp: August 20, 2012, 04:49:44 pm
content: it's rather good, and after rooting it you will get a full-fledged android tablet on eInk. i rooted mine the first day i get it.
HANTEK DSO5202B oscilloscope - Page 1
Forum section: electronics / general

author: Jane
author_rank: Frequent Contributor
timestamp: August 20, 2012, 04:07:05 pm
content: I am going to buy 200Mhz oscilloscope at a reasonable price. What do you think about HANTEK DSO5202B oscilloscope?Or can you suggest a better at a similar price?Thanks

author: Bored@Work
author_rank: Super Contributor
timestamp: August 20, 2012, 04:30:54 pm
content: Quote from: Jane on August 20, 2012, 04:07:05 pmOne of the largest and longest running thread on this forum is about that particular series of Hantek oscilloscopes. About its inside and how similar the DSO5102B, DSO5062B, and DSO5202B happen to be. And how the software is rather so-so.How did you manage to miss that thread?

author: Jane
author_rank: Frequent Contributor
timestamp: August 20, 2012, 04:40:01 pm
content: Thanks for the reply. But where is that thread here?
Pressure switch taken apart - Page 1
Forum section: electronics / general

author: norEL
author_rank: Contributor
timestamp: August 20, 2012, 09:58:43 am
content: If anyone are interested I have taken apart a pressure switch.Bailey & Mackey Ltd Type 107 Range -1 to +1bar Rated 3A@400V, 5A@250V and 5A@120Vhttp://youtu.be/m86C6cQhT6k
MOVED: The TangiBot 3D Printer, a clone of Makerbot Replicator - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: August 15, 2012, 12:32:30 am
content: This topic has been moved toOpen Source Hardware.https://www.eevblog.com/forum/index.php?topic=10124.0
Any R&S scope users? - Page 1
Forum section: electronics / general

author: Shas-O
author_rank: Contributor
timestamp: August 06, 2012, 08:22:10 pm
content: HiHas anybody had any lengthy hands on of the R&S scopes?http://www2.rohde-schwarz.com/en/products/test_and_measurement/Oscilloscopes/RTO.htmlThey look goodThe guys in our other lab seem to like them but take a while to get used to the interface.Any thoughts?ThanksDerek

author: Shas-O
author_rank: Contributor
timestamp: August 10, 2012, 07:56:48 am
content: Thats a no then !

author: anotherlin
author_rank: Frequent Contributor
timestamp: August 10, 2012, 11:29:43 am
content: I guess Hameg HMO scopes are actually R&S designs.

author: Rosendorfer
author_rank: Regular Contributor
timestamp: August 10, 2012, 12:03:48 pm
content: Quote from: Shas-O on August 06, 2012, 08:22:10 pmNice...." R&S®RTO Digital Oscilloscope - Scope of the Art"Have heard that If You buy one, You will get Mercedes with the package, just as small gift ...Quote from: anotherlin on August 10, 2012, 11:29:43 amAs far as I know HMO's is still Hameg design but "approved" by R&S as they are carrying their brand name now.Rosendorfer
Agilent 3000x AWG-What can it do? - Page 1
Forum section: electronics / general

author: djsb
author_rank: Super Contributor
timestamp: August 09, 2012, 08:56:28 pm
content: What is this generator able to do? I hear it can not be swept or modulated. Can it be programmed using software on a PC?Just how useful is it?Thanks.David.

author: KTP
author_rank: Frequent Contributor
timestamp: August 09, 2012, 09:11:00 pm
content: I haven't tried to program it from a PC, but I am sure it can be done.It is just kind of neat when you need a quick wave for testing something and don't want to drag out the standalone AWG (if you even have one...I don't right now). I would like an Agilent 33522A but can't justify $3,000 for it right now.The 3000x AWG did have enough memory and resolution to capture my voice and play it back:

author: EEVblog
author_rank: Unknown
timestamp: August 10, 2012, 12:36:57 am
content: Quote from: djsb on August 09, 2012, 08:56:28 pmNo, it cannot be swept or modulated from an external signal.In theory you could do that in the ARB software.Yes, it has PC software for it, but I have not tried it myself.It's ever so handy for just everyday basic signal generation.Dave.

author: Rufus
author_rank: Super Contributor
timestamp: August 10, 2012, 12:59:35 am
content: Quote from: EEVblog on August 10, 2012, 12:36:57 amThe whole instrument including the generator is controllable over USB or Ethernet with the expansion board. There is a post somewhere here about sweeping the generator and making signal measurements to characterise filters automatically under PC control.The generator can be set with full resolution (0.01Hz or whatever) remotely, something which can't be done from the front panel.

author: KTP
author_rank: Frequent Contributor
timestamp: August 10, 2012, 01:05:52 am
content: Quote from: Rufus on August 10, 2012, 12:59:35 amDid I miss this? I just started a thread about writing this software (to do what you just outlined). I don't want to reinvent the wheel though.

author: Rufus
author_rank: Super Contributor
timestamp: August 10, 2012, 01:15:40 am
content: Quote from: KTP on August 10, 2012, 01:05:52 amOn thishttps://www.eevblog.com/forum/blog-specific/new-agilent-scopes/330/page.
Does the Wavetek 270 Function Generator support variable symmetry? - Page 1
Forum section: electronics / general

author: JacobGrigg
author_rank: Newbie
timestamp: August 08, 2012, 04:34:00 am
content: Hi,Can the Wavetek 270 Function Generator vary the symmetry of a square wave for use as a PWM signal?I have looked through both of the following manuals and have not been able to find a definitive answer.http://www.testwall.com/datasheets/WAVET_270102943.pdfhttp://128.238.9.201/~kurt/manuals/manuals/Other/WAV%20270%20271%20287%20Introduction%20Manual.pdfThank you in advance,Jacob
Elenco Resistor Substitution Box RS-500- quick teardown  - Page 1
Forum section: electronics / general

author: reagle
author_rank: Unknown
timestamp: August 04, 2012, 06:44:56 pm
content: Bought this thing on Amazon for $25, figuring it's not a calibrated Decade box, but it's also 1/10 of the price.Here is what you get for that:A fancy handleLots or 1% resistors and switchesAll parts are soldered, though the amount of solder splashes and solder balls is rather excessive.(See a nice collection of solder balls I shook out of it)All resistors are bypassed by default, so unless you remember to leave on switch on you get a nice short across the terminalsLower ranges see higher percentage of resistance due to all the switch contacts in series.Higher values are closerOverall convenience- "it'll do" for cases when you just need to tweak resistor value