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Old 30th November 2012, 02:01 PM   #61
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I receive my board yesterday. Thank you Dirkwright!
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Old 30th November 2012, 02:08 PM   #62
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I receive my board yesterday. Thank you Dirkwright!
That's great. What are you going to use for a power supply? I have some boards made up for the LM78XX/LM79XX chips. I have also ordered some boards for a transformer driver circuit for a balanced, isolated output. Output level can be controlled with a simple 1k pot on the output of Glen's board.
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Old 30th November 2012, 09:09 PM   #63
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I'll use a Velleman kit #8042 I already built to start. It's a nice little low-power lab power supply using an LM317 and an LM337. I haven't even thought about a long-term solution. Or maybe I'll just always use the Velleman kit if it works well.
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Old 22nd January 2013, 10:45 AM   #64
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Hi,

I just completed Glen's generator PCB. Power up and testing remains. How is it progressing for the rest of you?
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File Type: jpg GK_Gen.JPG (278.4 KB, 175 views)
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Old 22nd January 2013, 12:43 PM   #65
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I haven't started yet on the board since I don't have the parts yet. One of the capacitors is backordered, though I suppose I can substitute a different one.
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Old 22nd January 2013, 03:08 PM   #66
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Thumbs up Working!

Fired it up - the oscillator swings and all frequencies seem to work.

Trimming and test (need better sound card) scheduled for later.
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Old 22nd January 2013, 03:47 PM   #67
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Fired it up - the oscillator swings and all frequencies seem to work.

Trimming and test (need better sound card) scheduled for later.
That's great!

I don't know how to adjust the trimmers. Can you share what you learn?
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Old 22nd January 2013, 07:27 PM   #68
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From what i understand so far.
The group of 4 trimmers (far away in my pic) is simply frequency adjust. Trimmers closest are rectifier balance. Since input to rectifiers is take after first integrator and second integrator that are 90 deg. apart and respective signal is then inverted 180 deg. we get four phases. These trimmers adjust balance between the 'phase pairs' that is sourced from first and second integrator, i.e. rectifier balance. It will be interesting to look at the rectifier output.
As for the single trimmer far left i think Glen's page explains it best (previous version, 8 Jan update): An Ultra Low Distortion State Variable Oscillator
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Last edited by AKN; 22nd January 2013 at 07:41 PM.
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Old 24th January 2013, 09:59 AM   #69
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Hi,

Frequencies adjusted, ~ 2-3Hz tolerance within each group. Then i checked the fft on the rectified output (tp2) and was able to null second harmonic on each frequency group.
As for the rest i need better test equipment.

The oscillator takes about 75mA@12V (+/-) no output load. The relays (frequency selection) at most ~260mA@6V.
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Old 24th January 2013, 12:58 PM   #70
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Thanks! My parts are on the way. Do you have any tips for soldering the SMD's in the middle of the board? My clip doesn't reach that far so I guess I can have my wife hold the part in place while I solder it.
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