| does someone have a good cmos overdrive schematic ??? - Click HERE for Original Thread |
| prorms |
| does someone have a good cmos overdrive schematic?? |
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| unclejed613 |
any particular reason for it being cmos?
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| 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. |
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| 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 |
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| prorms |
| no particular reason just wana try it out |
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| 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... |
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