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 Forum index » DIY Hardware and Software » The layout factory
Dual-wave LFO Vero layout
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kxspxr



Joined: Nov 20, 2008
Posts: 35
Location: Denmark

PostPosted: Mon Nov 24, 2008 4:25 am    Post subject: Dual-wave LFO Vero layout
Subject description: Super-simple dual-wave LFO from http://experimentalistsanonymous.com
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I made a vero layout from Colin's Super-simple dual LFO:
http://experimentalistsanonymous.com/diy/Schematics/Oscillators%20LFOs%20and%20Signal%20Generators/Simple%20Dual%20LFO.gif

Just finished soldering it. Works like a charm Smile


LFO.png
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Ojd



Joined: Feb 22, 2008
Posts: 65
Location: Ua
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PostPosted: Thu May 03, 2012 3:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

It works!
How to get bigger output voltage?
apart from adding another opamp?
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JovianPyx



Joined: Nov 20, 2007
Posts: 1257
Location: West Red Spot, Jupiter
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PostPosted: Mon Nov 24, 2014 10:55 am    Post subject: Reply with quote  Mark this post and the followings unread

The 68K resistor is close to 1/2 of 100K, this is limiting the output voltage swing. This resistor must be less than the 100K feedback resistor. Try increasing the 68K by adding other resistors in series, 27K might be a good place to start (68K + 27K = 95K). If it stops oscillating, then it's too large. I don't know what precision level your resistors are, but you should know that just because are resistor says "100K" doesn't mean it's exactly 100K, it could be a little more or a little less. Another way to maximize the output swing would be to put a pot (say, 50K) in series with the 68K (wiper and one side). Then increase it until it stops oscillating then back if off until it starts to oscillate again. Remove the pot and measure with an ohm meter. Then find a suitable fixed resistor to put in place of the pot. Make sure that the fixed resistor is less than or exactly equal to the pot value. You should verify this using the ohm meter.
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