. I did this when I was 10 or so, still have a little dent on my face just below my eye for my ill concieved experiments from a plastic bjt that went boom. 
Just an idea to found better solution
I would like use CFP configuration on my Amp
because his speed produce an intresting sound
so i have tested some solution
but CFP when works with power is very unstable
sometime generate RF
now I would like found a Simply solution
for example use this stage as driver
it's a beautiful idea
because his devices are little
so more similar, so more stable
but now generate a clipping:
probably because need an indipendent load (see figure)
( I am only a hypothesis )
or viceversa
need a common load between two rails... (next step of evaluation if that before fault)
again sorry for my english
I would like use CFP configuration on my Amp
because his speed produce an intresting sound
so i have tested some solution
but CFP when works with power is very unstable
sometime generate RF
now I would like found a Simply solution
for example use this stage as driver
it's a beautiful idea
because his devices are little
so more similar, so more stable
but now generate a clipping:
probably because need an indipendent load (see figure)
( I am only a hypothesis )
or viceversa
need a common load between two rails... (next step of evaluation if that before fault)
again sorry for my english
Attachments
Re: separate rail load
stee ....it seems that you dont get it !!! do you ????
this is almost thread jacking ...and also forum people dont have the time for this ...... in only one thread you posted almost 15 schematics .....
this is a thread to disscuss
JOY 200 AMPLIFIER MADE BY CATALIN
so please give us a brake
regards sakis ( with sexy avatar )
Stee said:
stee ....it seems that you dont get it !!! do you ????
this is almost thread jacking ...and also forum people dont have the time for this ...... in only one thread you posted almost 15 schematics .....
this is a thread to disscuss
JOY 200 AMPLIFIER MADE BY CATALIN
so please give us a brake
regards sakis ( with sexy avatar )
I use cfp only as driver in a EF, their is a way to reduce high frequency distortion and crossover artifacts of this arrangement but I cannot discuss it as I use this arrangement in a amp I sell to car audio and as a PA amp. I will only say it isnt sliding bias or error correction, its effects are mainly seen at high powers and at higher frequencies 1 KHZ and above. Its very simple, anyone can come up with this idea if he spends some time studying what happens in the circuit. A performance graph is on the fruga amp thread, I go for very low thd as my amps are for use at powers of 250 watt or more and need to have as little nasties as possible in high frequency domain.
Cant get rid of, but can be significantly reduced, Im trying something similar now with a triple but its more tricky here because of stability problems.
Do you mean having the cfp in class a ?? I already use the cfp in class a. Look at stee s example of cfp ef.
What I dont like is the extra complexity to achieve this but it has good sonic merits, when I remove the extra circuitry the human voices seem to have like a glare at the end of a sung word and with it it dissapears, cymbals become very detailed with the extra circuitry too. When listening at 200 300 watt levels the crossover artifacts sound horrible.
Do you mean having the cfp in class a ?? I already use the cfp in class a. Look at stee s example of cfp ef.
What I dont like is the extra complexity to achieve this but it has good sonic merits, when I remove the extra circuitry the human voices seem to have like a glare at the end of a sung word and with it it dissapears, cymbals become very detailed with the extra circuitry too. When listening at 200 300 watt levels the crossover artifacts sound horrible.
it is very nice to see
at least that some forum members are
solid rock value !!!!! the ratio as we speak remains ..... one post one schematic !!!!! way to go stee !!!
i am just jocking but i think that if i ever had the time to analyze all schematics posted by stee it will take something like a year ...
thanks people
at least that some forum members are
solid rock value !!!!! the ratio as we speak remains ..... one post one schematic !!!!! way to go stee !!!
i am just jocking but i think that if i ever had the time to analyze all schematics posted by stee it will take something like a year ...
thanks people
catalin said:
Catalin,
May I suggest you to not reference CCS's biasing resistors to ground?
Try to make the input stage + VAS as much as possible a constant current compound stage.
Keep the ground as clean as possible and use a separated PSU for output stage, and for inputs stages a good ccs+shunt feedbackless PSU
Regards,
Mihai
Nope, only in simulation, I hope no one tries to build it, output offset will be all over the place, the current mirror issue with complementary ltps has been discussed many times, rather try a cascode on the ltps. Do a search here of randy slones designs. He eventually had to change his current mirror designs because of this.
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