ECM
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I'm thinking of building this amp but I'm wondering...what is the purpose of C5 and R4 in this circuit? Can they be removed?
TORI amp questions
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amb
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C5 is a compensation capacitor to provide a margin of HF stability. R4, R3 and R2 are feedback resistors that set the voltage gain of the amp. In most amps R4 and R3 are one single resistor and C5 would be wired directly to the opamp's inverting input, but in this design the compensation cap is wired in between the two feedback resistors, probably to make the resultant HF rolloff more gradual.
ECM
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thanks amb.
by using a "slow" opamp can the HF compensation be left out?
maybe i'll build a prototype and see if it oscillates or has any HF problems.
by using a "slow" opamp can the HF compensation be left out?
maybe i'll build a prototype and see if it oscillates or has any HF problems.
amb
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Quote:
Probably, but the LF411 specified in the schematic is hardly "fast" by any means. To determine whether you need the cap (and what the optimal value is) you'll need a good square wave function generator and oscilloscope to watch for ringing.
| Originally Posted by ECM by using a "slow" opamp can the HF compensation be left out? maybe i'll build a prototype and see if it oscillates or has any HF problems. |
Probably, but the LF411 specified in the schematic is hardly "fast" by any means. To determine whether you need the cap (and what the optimal value is) you'll need a good square wave function generator and oscilloscope to watch for ringing.
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