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Old 2nd February 2012, 10:20 PM   #21
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Dirkw: I believe you are right. I also believe the pin-out of the LT1010 is wrong, pin 1 should be 2, 4 should be 2. Any comments? E
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Old 2nd February 2012, 10:26 PM   #22
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Originally Posted by mickeymoose View Post
Dirkw: I believe you are right. I also believe the pin-out of the LT1010 is wrong, pin 1 should be 2, 4 should be 2. Any comments? E
I don't know yet, haven't had time to study it any more, just read through the application note this afternoon... so busy! Thanks for the tip. I am not talented at making circuit boards. I can do this on nice perf board, though 20volts output is way too much! I think I'd put a volume control before the input to the LT1010. Another problem is that the LT1006 is really only available in surface mount. I don't think ai can surface mount something on perf board.... can I?
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Old 2nd February 2012, 11:06 PM   #23
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I am thinking about designing the board for this oscillator once I am satisfied with..., also there are many suppliers of surfacemount to DIP adaptors
Scaling the output is not a problem. I am looking into replacing (or adding to) the LT1010 with a hi-slew balanced output device. E
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Old 2nd February 2012, 11:09 PM   #24
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Quote:
Originally Posted by mickeymoose View Post
I am thinking about designing the board for this oscillator once I am satisfied with..., also there are many suppliers of surfacemount to DIP adaptors
Scaling the output is not a problem. I am looking into replacing (or adding to) the LT1010 with a hi-slew balanced output device. E
Oh cool. I'm in for a group buy. Balanced output would be fantastic!

Linear Technology sells the chips direct no problem, and apparently cheaper than Digikey.
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Old 2nd February 2012, 11:25 PM   #25
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In the Williams circuit, sometimes that CdS photocell can be hard to find in any venders stock.
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Old 2nd February 2012, 11:29 PM   #26
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Default CdS

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In the Williams circuit, sometimes that CdS photocell can be hard to find in any venders stock.
Check with Jackinnj for the CdS.
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Old 2nd February 2012, 11:32 PM   #27
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It looks like this LT circuit has been discussed before:
Low Distortion Signal Generator
back in 2004.
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Old 2nd February 2012, 11:33 PM   #28
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This looks like the animal we need:
Excelitas Technologies Sensors - VTL5C10 - Optoelectronics & Lighting - Optocouplers/Optoisolators - Allied Electronics

I ordered 3 of them. I can share with mickeymoose or whoever is serious about designing a board.

Last edited by dirkwright; 2nd February 2012 at 11:38 PM.
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Old 2nd February 2012, 11:35 PM   #29
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Random musings:
As low THD can be acieved only with low tol R+C in the Wien Bridge (stereo pot can have up to a +/-20% variation between segments), me thinks I will replace the dual-pot with a stereo digital pot and a small-value dual pot in series with the digital for in-between frequencies. Adjustment of the digital pot through a rotary encoder. This will require a digital frequency read-out, of course.....now this is getting involved! E
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Old 2nd February 2012, 11:51 PM   #30
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Quote:
Originally Posted by mickeymoose View Post
Random musings:
As low THD can be acieved only with low tol R+C in the Wien Bridge (stereo pot can have up to a +/-20% variation between segments), me thinks I will replace the dual-pot with a stereo digital pot and a small-value dual pot in series with the digital for in-between frequencies. Adjustment of the digital pot through a rotary encoder. This will require a digital frequency read-out, of course.....now this is getting involved! E
It would be a lot easier to make if I can just find a dual pot that has matched sections.

I could put 2 of these together:
http://www.bourns.com/data/global/pdfs/6574.pdf

Last edited by dirkwright; 2nd February 2012 at 11:58 PM.
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