Low-distortion Audio-range Oscillator - Page 6 - diyAudio
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Old 6th February 2012, 12:07 AM   #51
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Considering that I have a very old HP331 distortion analyzer, I wonder if I could even measure .0003%. My HP331 is in very good shape. What got me looking into this is I bought a GW (goodwill) function generator. I had also just got the HP331. So I tested both. The function generator measured around 1%. Thats what started this.
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Old 6th February 2012, 12:10 AM   #52
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Quote:
Originally Posted by dennismiller55 View Post
Considering that I have a very old HP331 distortion analyzer, I wonder if I could even measure .0003%. My HP331 is in very good shape. What got me looking into this is I bought a GW (goodwill) function generator. I had also just got the HP331. So I tested both. The function generator measured around 1%. Thats what started this.
I had the one before that, it had octal tubes in it.
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Old 6th February 2012, 12:31 AM   #53
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dirk: now you are putting pressure on me!

I started this project for my own use a while back and it is designed with my needs/wants

The rotary encoder/digital pots can easily be replaced with one/two dual pots. The frequency counter is on a seperate pcb and can be omitted

The pcbs are designed to fit into a Pactec TT-9VB hanheld box. I yet have to work on the ps unit, propably a battery/wallwart combo

I am not really interested in a group-buy situation but will make the Gerber files and parts list availble

A sld of the thing is attached. E
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Old 6th February 2012, 12:36 AM   #54
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Oh sorry man. That handheld box is designed for batteries, but I guess you can put a wall wart connector on it.

Thanks for working on this.
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Old 6th February 2012, 03:09 AM   #55
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If ultra-low distortion is not required, a cheap Lodestar Signal Generator is not too bad. It has 0.017% THD at 1K and 10K with 1V rms output.
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Old 6th February 2012, 01:13 PM   #56
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Thanks. That's certainly an option. I guess I'm committed to building this one since I bought 3 of the $8+ LED/resistor things. I'll probably make it myself on perf board. I can't make circuit boards at all.

I was thinking of using a commercial digital frequency counter as the readout for this oscillator. They don't cost much I think.

Last edited by dirkwright; 6th February 2012 at 01:41 PM.
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Old 6th February 2012, 04:06 PM   #57
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dirk: where did you find the VTL5C10 or CLM410? These are obsoleted by ther mfgs. I found a VLT5C10 at Excelitas and a NSL-32B-101 or H-101 at Silonex. Either would do but I could not find a stocking distie for either. E
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Old 6th February 2012, 04:31 PM   #58
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Originally Posted by mickeymoose View Post
dirk: where did you find the VTL5C10 or CLM410? These are obsoleted by ther mfgs. I found a VLT5C10 at Excelitas and a NSL-32B-101 or H-101 at Silonex. Either would do but I could not find a stocking distie for either. E
I posted the link earlier.

Here:
http://www.alliedelec.com/search/pro...x?SKU=70219611

I think I just want to make my own oscillator on perf board, mostly because I want some custom features.

As for the optocoupler, there's a whole section on them at Mouser:
http://www.mouser.com/Optoelectronic...ers/_/N-6x5ji/
Maybe there's a better one made these days, and cheaper? I don't know.

Last edited by dirkwright; 6th February 2012 at 04:35 PM.
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Old 6th February 2012, 06:32 PM   #59
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Quote:
Originally Posted by mickeymoose View Post
dirk: where did you find the VTL5C10 or CLM410? These are obsoleted by ther mfgs. I found a VLT5C10 at Excelitas and a NSL-32B-101 or H-101 at Silonex. Either would do but I could not find a stocking distie for either. E
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Old 7th February 2012, 06:44 PM   #60
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Does anyone have a source for a good surface mount to DIP adapter? I'm having trouble finding one.
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