does someone have a good cmos overdrive schematic ???

[prorms]

does someone have a good cmos overdrive schematic??

 

[unclejed613]

any particular reason for it being cmos?

 

[drummer_Dave]

I have heard this is suppose to be good, doesnt take long to bread board it and try

http://www.freeinfosociety.com/electronics/schemview.php?id=325

www.tonepad.com have some stuff as well

Dave

 

[unclejed613]

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.

 

[drummer_Dave]

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.


Dave

 

[prorms]

no particular reason just wana try it out

 

[unclejed613]

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...

 

[Khron]

Have you checked out the designs available at http://www.runoffgroove.com/articles.html ???