Low distortion audio oscillator board/kit - are any still available? - Page 1
Forum section: electronics / testgear

author: cvanc
author_rank: Frequent Contributor
timestamp: February 25, 2018, 09:38:43 pm
content: There used to be one or two of these available - fixed frequency oscillator boards with low distortion at a very reasonable price. Some were kits and some were pre-stuffed boards ready to go into your own enclosure.I'm on the hunt for one and it seems they may have gone the way of the dodo bird; I can't really find any! Are you aware of one that I might have missed?To clarify, 'low distortion' to me means well under 0.1% THD. The kits I can currently find are specified at this value and I'd like to do better (or even MUCH better) if possible. Thanks.

author: RandallMcRee
author_rank: Frequent Contributor
timestamp: February 25, 2018, 10:03:33 pm
content: Try posting in this thread:http://www.diyaudio.com/forums/equipment-and-tools/205304-low-distortion-audio-range-oscillator-706.htmlVicnic is the fellow who has the 0.001% oscillators (proven) available.He says--send him a PM.

author: cvanc
author_rank: Frequent Contributor
timestamp: February 25, 2018, 11:01:42 pm
content: Thank you! I've sent him a PM.

author: RGK
author_rank: Contributor
timestamp: February 26, 2018, 07:18:42 am
content: Three nice low-distortion options are:- Viktors pre-built oscillator- Janascard project- Frex projectBK

author: cat87
author_rank: Regular Contributor
timestamp: February 26, 2018, 12:59:59 pm
content: Frex's design is based on App Note 67 from Linear. You can find it here:http://cds.linear.com/docs/en/application-note/an67f.pdfpage 62.

author: oldway
author_rank: Super Contributor
timestamp: February 26, 2018, 01:16:05 pm
content: Some informations about Wien bridge low distortion oscillator.

author: trys
author_rank: Regular Contributor
timestamp: February 26, 2018, 08:55:13 pm
content: Quote from: cat87 on February 26, 2018, 12:59:59 pmThat link is broken with the comma at the end of it by the look of it. Here it is:http://cds.linear.com/docs/en/application-note/an67f.pdfA great read.Edited:I've fixed my link as well now! Sorry about that!

author: bitseeker
author_rank: Super Contributor
timestamp: February 27, 2018, 01:41:53 am
content: trys, for some reason your repaste also has a comma at the end of the actual link URL (not being shown). You can see it when hovering the mouse over.

author: cat87
author_rank: Regular Contributor
timestamp: February 27, 2018, 08:57:19 am
content: QuoteSorry about that. It's fixed now.

author: macboy
author_rank: Super Contributor
timestamp: February 27, 2018, 02:14:14 pm
content: I was also on the hunt for Victor's oscillator. I had just missed one on ebay, so set up a search, and had to wait over 6 months for another one to appear. I got the 1 kHz model. I measure mine at <= 0.00008% (0.8 ppm) THD on my Panny VP-7722, but that is the measurement floor of that instrument, so it is not a meaningful measurement. The actual THD is lower. It's a nice little unit to have. Get one while you can; the superb National opamp he designed into it is now out of production (the fab was closed).

author: trys
author_rank: Regular Contributor
timestamp: February 27, 2018, 08:11:27 pm
content: I was given a price and availability of the oscillator by sending him a PM. The prices will depend on other factors, such as what country you are in.