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Old 21st February 2008, 04:38 PM   #1
prorms is offline prorms  United States
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Default does someone have a good cmos overdrive schematic ???

does someone have a good cmos overdrive schematic??
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Old 22nd February 2008, 08:15 PM   #2
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any particular reason for it being cmos?






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Old 22nd February 2008, 09:04 PM   #3
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I have heard this is suppose to be good, doesnt take long to bread board it and try

http://www.freeinfosociety.com/elect...iew.php?id=325

www.tonepad.com have some stuff as well

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Old 24th February 2008, 02:04 AM   #4
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the hex inverter fuzz...... actually i find a TL072 more flexible and stable. also, the problem i see using a CMOS chip for a fuzz is a reliability issue. static electricity, just from plugging the cable into a guitar (all it takes is a measly 250V charge) to turn the hex inverter into a "never" gate, or a "pop amp".... bipolar and jfet inputs are a lot more forgiving of static discharge.if you can feel a static discharge on your fingertip, you're already up to about 5kV, so a charge that would damage the input of the CMOS chip might never be noticed, and suddenly the fuzz box no longer works.
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Old 26th February 2008, 04:59 PM   #5
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I agree with unclejed613, however there are several ways around this static problem such as using clamping diodes, or even better using a simple capacitor coupled pre-amp before the cmos stage (transistor, op amp etc...) there are ways around it, best is try breadboard the circuit and try it out for your self. good luck.


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Old 26th February 2008, 08:43 PM   #6
prorms is offline prorms  United States
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no particular reason just wana try it out
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Old 2nd March 2008, 05:27 AM   #7
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the following is what i use often as an onboard preamp. i usually use a TL062, not the LT part. if you want variable gain, use a pot for R3. the first half of the op amp is used as a "rail splitter" to provide a +/-4.5V supply from a standard 9V battery. the same principal can be used with a quad op amp, leaving 3 active sections available for preamp, tone control, etc...
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Old 3rd March 2008, 10:33 AM   #8
Khron is offline Khron  Romania
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Have you checked out the designs available at http://www.runoffgroove.com/articles.html ???
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