QUASI Amplifier for Beginners

[AudioSenseCD]

thx Mr. Miles for this quasi amp

if you teach me sir how to do a PNP quasi i will update sooner or later i'm glad that we have you Mr. Miles thank you very much.

regards

[apexaudio]

Originally Posted by AudioSenseCD

@apex yes sir miles do i have to reverse polarity the diodes and the zener diodes and the pre drivers and vas from pnp to npn and vice versa of their location from mje340=mje350 mje150031=mje150030 location

If you want PNP outputs, you must revert rail polarity, diodes polarity and all transistors must be pnp instead npn and vice versa.

[AudioSenseCD]

Originally Posted by apexaudio

If you want PNP outputs, you must revert rail polarity, diodes polarity and all transistors must be pnp instead npn and vice versa.

sir miles kindly check if it is correct

[AndrewT]

not correct.

you have used the PSU Zero Volts (between the capacitors) as an Audio Ground. no no.

you have swapped the +ve & -ve supplies.

you have no emitter resistors in the emitter leads of the four leftmost output devices. no no.

you have the mains fuse and the mains switch in the two different Mains Lines. no no.

[AudioSenseCD]

@andrewT sir kindly corect the wrongs ones because i can't get what you mean plss...
regards

[formula 22]

Hi people!
Where the schematics of this quasi amplifier, as one friend told me that she is wrong?
Cheers!

[AudioSenseCD]

post number 1 page 1

[formula 22]

Originally Posted by AudioSenseCD

post number 1 page 1

Hi
Need to add a resistor of 0.33ohm/5W on the transistor 2N3773 or 2SC2922 (for Ucc=+/-70V) in the emitter of the negative branch of power supply.
Ceers!

[sanju21]

Hi there
i want to use apex550 @ 2 ohm.
what should be the optimum rail voltage.i mean i want

400 watts @ 2 ohm
800 watts @ 4 ohm (bridged) mono

is it possible? thanks in advance

[AndrewT]

400W into 2r0 is equivalent to 40Vpk and 10Apk into your 2r0 load.
Expect +-50Vdc to be suitable.
Two amplifiers from the same PSU will require ~60Apk transient current demand.
Design for that 60Apk, or you won't get decent performance from the speakers.