built a kit F5
is written that will not clip until 20 v peak, mine is clipping at 15-16 v peak
what can be the cause for it
williams
is written that will not clip until 20 v peak, mine is clipping at 15-16 v peak
what can be the cause for it
williams
Have just checked the F5 thread, with a 20V supply, 15V peak (11V rms) output is correct, there is approx 4.6V across the output FET.
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my pwr suplly is +/-23.7vdc under load, it is filtered by 0.2 Farad for each rail.
the voltage across the vcc and fet source resistor is 0.6v quite stable=1.3A
over 15v peak i get the start of clipping signal
i think that the current protection circuit may be cause
best regards
williams
the voltage across the vcc and fet source resistor is 0.6v quite stable=1.3A
over 15v peak i get the start of clipping signal
i think that the current protection circuit may be cause
best regards
williams
Normally it should be around 20v, in order to deliver the rated power.
I remember there had been a change concerning limiter resistor values.
Why not just disconnect those limiters and see.
I remember there had been a change concerning limiter resistor values.
Why not just disconnect those limiters and see.
Indeed, many have reported it "sounds better" when the limiters are not present... are you sure the output is clipping and not ur input signal??
Got 'scope? 😀
_-_-bear
Got 'scope? 😀
_-_-bear
Nelson has not sent me to jail, yet.
But I am going to repeat what I posted earlier.
I believe the current limiter is set too low.
It should allow all valid audio signals to pass to all valid speaker loads.
I think the transient currents into reactive loads are clipped with the existing resistor values.
But that should not show up when testing into resistive loads.
But I am going to repeat what I posted earlier.
I believe the current limiter is set too low.
It should allow all valid audio signals to pass to all valid speaker loads.
I think the transient currents into reactive loads are clipped with the existing resistor values.
But that should not show up when testing into resistive loads.
What load are you using to measure this?
I assumed an 8 ohm resistor until I realised no one had specified.
Doug
I assumed an 8 ohm resistor until I realised no one had specified.
Doug
hi all,
i use a 7 ohms load at the channel tested
i don't know what are the quality of the active components I received with the kit, if this could be the cause of the problems, i don't know
in the real world my speakers are ACOUSTAT 3, and this small pwr amp is driving not so bad at all, but with small dynamic range
1- i will increase the vcc to +/- 30 vdc
2- readjust the bias to 1.5amps
3- this will result in a 45watts dissipation for each fet
4- my heat sinks can dissipate about 60 watts for each fet
will see how is running this way
hi dougl, where did you got the Latin
best regards
Williams
i use a 7 ohms load at the channel tested
i don't know what are the quality of the active components I received with the kit, if this could be the cause of the problems, i don't know
in the real world my speakers are ACOUSTAT 3, and this small pwr amp is driving not so bad at all, but with small dynamic range
1- i will increase the vcc to +/- 30 vdc
2- readjust the bias to 1.5amps
3- this will result in a 45watts dissipation for each fet
4- my heat sinks can dissipate about 60 watts for each fet
will see how is running this way
hi dougl, where did you got the Latin
best regards
Williams
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