Who would like an ultra-low distortion audio oscillator PCB? - Page 1
Forum section: electronics / general

author: GK
author_rank: Super Contributor
timestamp: October 14, 2012, 11:52:22 pm
content: UPDATE: THIS OFFER IS NOW CLOSED. I WILL NOT BE HAVING ANY FURTHER BOARDS MADE

author: EEVblog
author_rank: Unknown
timestamp: October 15, 2012, 01:58:33 am
content: Sounds like a case for a Kickstarter crowd funded project?Or in your case, Pozzible for Oz.Dave.

author: JuKu
author_rank: Frequent Contributor
timestamp: October 15, 2012, 06:32:11 am
content: I'd be interested about notch filter, provided a little bit better documentation. Either ready-made or PCB only. I have AP and dScope audio analyzers, so I can asses how good that is.

author: krivx
author_rank: Frequent Contributor
timestamp: October 15, 2012, 10:27:59 am
content: I would be interested but I'd like to have some idea of cost before committing...

author: EEVblog
author_rank: Unknown
timestamp: October 15, 2012, 11:16:04 am
content: Quote from: GK on October 15, 2012, 09:19:48 amErr, you haven't been following Kickstarter then! (there is another recent thread on it).Every kid in his garage is getting 6 or 7 digits for any idea they throw out there. 5 digits is practically guaranteed on Kickstarter for any flashing led board.How about $313K for a micro on a board?http://www.kickstarter.com/projects/digistump/digispark-the-tiny-arduino-enabled-usb-dev-boardAn example of a simple bare board that met it's very modest funding target:http://www.kickstarter.com/projects/671510748/superlf398-low-parts-count-sample-and-hold?ref=cardPozzible is much less simply because it does not have the market presence and hype of Kickstarter.How many actually deliver? Well, almost all of them are later than promised because so many underestimate how much time/effort it takes to manufacture stuff. And some completely fall through and deliver nothing after a year or two.There is so much failure that Kickstarter have recently changed the rules to try and stop "pie-in-the-sky" ideas getting listed.But if you need money up front, and effectively get "pre-sales", it's well worth considering.Dave.

author: dirkwright
author_rank: Contributor
timestamp: October 15, 2012, 12:30:25 pm
content: Thanks Glen! I'm in for one board. I'm in the USA. I would prefer plated through holes, solder mask two sides, and silk screen one side.

author: poptones
author_rank: Frequent Contributor
timestamp: October 16, 2012, 07:43:12 am
content: You may be underestimating your market based on low sampling frequency. Post an article in rec-audio-high-end and one in rec-audio-tech and see how many responses you get.

author: dirkwright
author_rank: Contributor
timestamp: October 16, 2012, 12:58:02 pm
content: I posted it in a thread specific for ultra low distortion oscillators on DIYaudio.http://www.diyaudio.com/forums/equipment-tools/205304-low-distortion-audio-range-oscillator-73.html

author: dirkwright
author_rank: Contributor
timestamp: October 16, 2012, 08:31:22 pm
content: I also posted this thread in the DIYaudio group buy forum:http://www.diyaudio.com/forums/group-buys/221670-sv-oscillator-pcb-group-buy.htmlHopefully there will be more people interested in your oscillator.

author: Short Circuit
author_rank: Frequent Contributor
timestamp: October 17, 2012, 08:37:59 am
content: Just put the quotation in the cart, and it will show the shipping. You can still abort.As for the oscillator demand, I gues it will help to 'sell' it a bit more; where are the images of the PCB, a bill of materials, maybe a finished build cost estimate, technical specs such as power supply & consuimption. When you have all these things together, more people will be interested. Heck, even I might be

author: dirkwright
author_rank: Contributor
timestamp: October 18, 2012, 04:19:15 pm
content: Wow, that's a lot for shipping a board! The price for the boards is good though. It's less than what I can get here in the USA. Let's hope there's more interest in this board. How many do you have interested so far?

author: grenert
author_rank: Frequent Contributor
timestamp: October 18, 2012, 04:29:23 pm
content: Quote from: dirkwright on October 18, 2012, 04:19:15 pmI think that $17 is the total cost with shipping [(298+50)/20=17.4].

author: mlloyd1
author_rank: Contributor
timestamp: October 18, 2012, 04:45:33 pm
content: GlennK:Count me in for one board.mlloyd1

author: Noize
author_rank: Regular Contributor
timestamp: October 19, 2012, 02:32:20 pm
content: Count me in for one please.

author: dirkwright
author_rank: Contributor
timestamp: October 19, 2012, 02:48:30 pm
content: Glen, you've got 3 more people from the DIYaudio message board in for 1 board each.http://www.diyaudio.com/forums/group-buys/221670-sv-oscillator-pcb-group-buy.html#post3207231

author: dirkwright
author_rank: Contributor
timestamp: October 19, 2012, 02:49:33 pm
content: So, you have 6 total so far.

author: dirkwright
author_rank: Contributor
timestamp: October 23, 2012, 09:49:41 pm
content: Glen, there are 3 different surface mount version for the HEF4051. Which one did you use?See the data sheet here:http://www.nxp.com/documents/data_sheet/HEF4051B.pdfThanks.

author: dirkwright
author_rank: Contributor
timestamp: October 26, 2012, 05:52:55 pm
content: Hi Glen, which trimpots did you use for this oscillator? Your BOM only says "trimpot", but there are many different kinds. Thanks.

author: dirkwright
author_rank: Contributor
timestamp: October 30, 2012, 03:34:16 pm
content: Quote from: GK on October 29, 2012, 09:57:42 pmOK, thanks. I'm almost done with a Mouser project that has almost all the parts. Mouser doesn't carry Analog Devices so they don't have the AD8226.

author: dirkwright
author_rank: Contributor
timestamp: November 04, 2012, 02:19:03 pm
content: Ok, I've created a project on Mouser.com:https://www.mouser.com/ProjectManager/ProjectDetail.aspx?State=EDIT&ProjectGUID=7cd544dd-57f5-43d2-9873-5945469b09e3Can you take a look to see if I got everything right? I know I'm missing the AD8226 (because Mouser doesn't carry Analog Devices). Also, there are no switches or other controls listed since I didn't know yet which ones to get. Otherwise, everything for the board should be there.

author: dirkwright
author_rank: Contributor
timestamp: November 05, 2012, 03:39:35 pm
content: Will it run just as well on +/-12VDC instead of 15VDC? I'm thinking that I'd like to run it off of batteries and 12VDC is more convenient than 15VDC.

author: dirkwright
author_rank: Contributor
timestamp: November 05, 2012, 08:07:05 pm
content: How do you control the output voltage for this oscillator?

author: dirkwright
author_rank: Contributor
timestamp: November 13, 2012, 02:43:20 pm
content: Thanks Glen! much appreciated!

author: dirkwright
author_rank: Contributor
timestamp: November 23, 2012, 02:30:29 pm
content: OK, I'll let you know when it arrives. Thanks again for all of your hard work and generosity.

author: dirkwright
author_rank: Contributor
timestamp: November 26, 2012, 08:11:52 pm
content: Hi Glen, I got my board today! Thank you!

author: dirkwright
author_rank: Contributor
timestamp: March 28, 2013, 04:43:50 pm
content: Yes Glen, I got your board up and running! Thanks so much! I made one small mistake that was gratefully not fatal. Once corrected, it runs great but I have not had the time to tune it up yet.

author: AKN
author_rank: Newbie
timestamp: April 01, 2013, 06:27:55 pm
content: Hi all,My first post on this forum.Suppose I'm one of the two who has reported a working oscillator. I bought two PCB's, one for myself (ready two months ago) and one for a friend. The latter got fired up and tested OK just two hours ago. I can now confirm that one more (third?) oscillator is up and running.Glen, many thanks for designing this oscillator and supplying PCB's.Best Regards/ Anders

author: AKN
author_rank: Newbie
timestamp: April 02, 2013, 10:33:17 am
content: No better than -100dB HD and -120dB noise floor. My current sound card setup is not sufficient for measuring this oscillator. I could implement a notch but first I will rework my test setup.

author: AudioplatinumService
author_rank: Contributor
timestamp: January 02, 2014, 09:40:31 am
content: HiI am interested in one board, any left? Maybe too late...Best Regards,Raf

author: Po6ept
author_rank: Regular Contributor
timestamp: January 03, 2014, 04:58:13 am
content: If you ever think of ordering another batch, please count me in.

author: burbeck
author_rank: Newbie
timestamp: January 03, 2014, 09:27:09 pm
content: hi Glenput me down for a pcb if you do another batchkind regardsbob

author: rob040
author_rank: Contributor
timestamp: March 03, 2016, 09:20:02 pm
content: I would like to build Glens ultra-low distortion audio oscillator (including the line driver part). It's for personal use (hobby).Does anyone have the gerber files available?I tried to contact Glen, but can't get through :-(

author: DanNorman
author_rank: Contributor
timestamp: March 04, 2016, 06:51:59 pm
content: Me too!I suppose the files are available still?

author: _Wim_
author_rank: Super Contributor
timestamp: March 04, 2016, 07:16:29 pm
content: Maybe a bit less fun, but I can fully recommend this guy boards:http://www.ebay.com/sch/mickevich/m.html?item=222007021013&hash=item33b0a64dd5%3Am%3AmET82r_nyfTTV3JMQmFCAKg&rt=nc&_trksid=p2047675.l2562

author: rob040
author_rank: Contributor
timestamp: March 08, 2016, 01:13:44 pm
content: Quote from: _Wim_ on March 04, 2016, 07:16:29 pmDistortion figure is excellent, but indeed (much) less fun. Only one frequency per board available and as far as I could see the guy has only two frequencies in his portfolio.Glen's version has 12 frequencies spread over the audio spectrum.@DanNorman: I could not find them, therefore my appeal in this threat. If you catch them, please drop me a line.

author: _Wim_
author_rank: Super Contributor
timestamp: March 08, 2016, 08:45:01 pm
content: Yes, only a couple of frequency's available from this guy. I think it depends what your actual use is. In my case, I use it as a reference to challenge my audio measurement system (pc with good qualitiy sound card). By having an ultra low distorsion generator I can check how much distorsion in introduced by the measumenet system itself (at a single frequency of course...)If you want many frequencys and DIY, I would built a good quality DAC board with optical digital input and power this board from an isolated power supply. Test signals I would generate with one of the many audio measurement softwares available for free (I presume you pc has a digital out, otherwise you will need an additional sound card).If you want an analyzer also, just build an ADC board the same way. By using the optical digital out/in and isolated power supplies (seperate power supply for DAC and ADC), you avoid ground loop issues when connecting to the DUT. Don't forget to install some input protection on the ADC if you want to test amplifiers also.For an isolator power supply, these look like a very good deal:http://www.mouser.be/new/murata/murata-ps-nxe1/

author: rob040
author_rank: Contributor
timestamp: March 16, 2016, 01:59:16 pm
content: Hi Wim,Thanks for thinking out loud. To be honest, I am more in for analog circuits. Easier to understand and also more fun to build (for me anyway).I want to build a good sine wave oscillator with multiple frequencies in the audio range (up to 100kHz) and a THD meter to judge audio equipment.Bob Cordells project is a nice one, certainly with the PCB's that Guiliano designed. Slightly better is the design of Glen, but then it would be nice to have the gerbers. Still browsing for them.There is a lot to read and learn on the net. And I'm not in a hurry.Best regards,Rob.

author: _Wim_
author_rank: Super Contributor
timestamp: March 16, 2016, 06:35:38 pm
content: Building analog stuff indeed can be fun, so no argument against that. Keep us updated on your project!

author: JoeD
author_rank: Contributor
timestamp: April 26, 2016, 10:53:44 am
content: Please put me down for a board also. Let me know when it's time to pay!RegardsJoeD

author: deephaven
author_rank: Frequent Contributor
timestamp: May 01, 2016, 05:17:32 pm
content: Quote from: GK on April 29, 2016, 01:31:00 amThanks Glen.

author: timb
author_rank: Super Contributor
timestamp: May 02, 2016, 12:24:01 am
content: Quote from: GK on April 29, 2016, 01:31:00 amThanks!

author: rob040
author_rank: Contributor
timestamp: May 05, 2016, 04:53:27 pm
content: Thanks Glen for making the files available again and the updates. Appreciate it!

author: markirwin
author_rank: Newbie
timestamp: May 10, 2016, 06:30:20 am
content: Hi Guys,I see that the files are no longer available from glenstuff? Does anyone have them?Mark

author: Pjotr
author_rank: Frequent Contributor
timestamp: May 15, 2016, 03:50:12 pm
content: Indeed, what happened? Without what abouts this thread looks empty.