QUASI Amplifier for Beginners

[apexaudio]

what do you think is the suitable driver for this amp on this site???
Crown - The Professional Choice

any suggestions?

I suggest to use this speakers projects.

 

[boytaho]

what is the full power into mono 8ohms, 4ohms and bridge 8ohms, 4 ohms?

 

[echobase]

God gracious Apex, this is a great success. I made it and it works fine. Thanks you very much for the schematics and the PCB layout. Even tough I modified it a bit but it still retain the same artwork as yours. Thanks again. Below are the images:


I am using ExpressPCB for the PCB layout and the schematic. You can download it for free from this website: ExpressPCB - Free PCB layout and schematic software

 

[tantang]

Hiii...sir, i have some transistor pnp A1943, what can to modification to pnp follower??? thank you...

 

[tantang]

plase care to share your scema quasi pnp output.

thanks

 

[apexaudio]

God gracious Apex, this is a great success. I made it and it works fine. Thanks you very much for the schematics and the PCB layout. Even tough I modified it a bit but it still retain the same artwork as yours. Thanks again. Below are the images:


I am using ExpressPCB for the PCB layout and the schematic. You can download it for free from this website: ExpressPCB - Free PCB layout and schematic software

Nice work, 2N3773 on pictures are fake motorola!
Regards

 

[echobase]

schematic for the preamp

Nice work, 2N3773 on pictures are fake motorola!
Regards

Who care about fake! as as your design work! We got billions of them here in the market! Would you mind show me the schematic for the preamp please?

Best regard

Albert B.

 

[AndrewT]

Below are the images:

more than 3MB for six pics.

When is the Forum going to stop this lunacy?

 

[djk]

"Who care about fake! "

Fake parts are seldom as robust as original parts, I suggest you add a DC protect circuit.

 

[apexaudio]

plase care to share your scema quasi pnp output.

thanks

See post #240,
Regards

 

[apexaudio]

what is the full power into mono 8ohms, 4ohms and bridge 8ohms, 4 ohms?

See post #59
Regards

 

[apexaudio]

XLR Amp input circuit with GND 'lift' switch.

 

[boytaho]

See post #59
Regards

oh i see, that is for +-65... how about with +-78v dc with 5 pairs of c5200?...

thanks
regards

 

[echobase]

The verdict

"Who care about fake! "

Fake parts are seldom as robust as original parts, I suggest you add a DC protect circuit.

It is hard to find original parts in this regions. If you do, it will cost you lot (may be around RM120.00/US38.00). It's alright to use fake one at this initial stage. After all it is an experimental project. When I found that this project work then I'll go for the originall one. Even tough you said it was fake, but it was from Mexico. You suggest to add DC protection circuit, can you show me how or just simply post the schematic.

Thanks, best regard.
Echobase

 

[apexaudio]

Use this simple DC protect with triac.

 

[noobie]

Use this simple DC protect with triac.

the coil, # 0f wire and how many turns?

 

[apexaudio]

the coil, # 0f wire and how many turns?

15 turns on 0f 10mm with 1,2mm wire.

 

[noobie]

15 turns on 0f 10mm with 1,2mm wire.

thanks

regards

 

[echobase]

preamp and speaker protection circuit

Use this simple DC protect with triac.

Thanks again for the tips. once again I am asking for the preamp and speaker protection circuit. I hope that I am not asking too much from you.

Best regard

Albert

P.S Are you Star Wars fan!

 

[apexaudio]

Thanks again for the tips. once again I am asking for the preamp and speaker protection circuit. I hope that I am not asking too much from you.

Best regard

Albert

P.S Are you Star Wars fan!

See my other threads...