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Old 25th March 2020, 06:01 PM   #16281
Eslheadphone is offline Eslheadphone  United States
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Under each piece of blue heatshrink tubing is a gate stopper resistor. The F5 amp has been running this way for years with no problem. The resistor along with the gate capacitance forms a low pass filter which suppresses any tendency toward oscillation.
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Old 25th March 2020, 06:10 PM   #16282
Kosst Amojan is offline Kosst Amojan  United States
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Quote:
Originally Posted by Hikari1 View Post
The extra gain is not because you need it. It is to keep the circuit stable. Read the F5T article and follow the schematic. If you deviate from it and try to take shortcuts you will run into problems.

And yes it's possible to build a front end with the f5 topology. It's been done many times. And even done by Mr. Pass. Check the BA-3 front end (f5 w/no feedback) or the vfet 2 front end. Or EVUL's F5 headphone amp.

Is it possible to use your f5 power amp as a preamp? Yes. But why? It will noisy (compared to a regular preamp) and it's built for current, not voltage. It's not a good choice.
It was just a thought. I've got a pre-amp I'm happy with.
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Old 25th March 2020, 06:11 PM   #16283
Kosst Amojan is offline Kosst Amojan  United States
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Quote:
Originally Posted by Eslheadphone View Post
Under each piece of blue heatshrink tubing is a gate stopper resistor. The F5 amp has been running this way for years with no problem. The resistor along with the gate capacitance forms a low pass filter which suppresses any tendency toward oscillation.
I'm going to be making that modification tonight.
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