QUASI Amplifier for Beginners

[apexaudio]

apex sir,

how does this limiter works???...how do i know that the limiter limiting????...how do i modify the circuit if use to another amp???...


tnx...

ees...

Limiter activate amp output voltage at clip level (or low if you want limit amp under full power) and it atenuate amp input. Clip level voltage is about 5-15V under rail voltage ( rail voltage +/-75V DC, clip level about 65V).
You can adjust limit level with different value of resistors 820R to get 2V in point 820R, 68R whan amp out is on clip level voltage.
Use formula: Rx=Uclip/0,03 or Uclip=0,03XRx
Rx is 3280R (4x820R) in schematic, Uclip is 100V this clip level is for APEX H900 you must use low value for Rx depend of rail voltage or if you want limit amp at low than full power power use formula P=(UrmsXUrms)/Rload, Urms=Uclip/1,4
Regards

 

[A square]

hi

hello sir
this is my project....

 

[apexaudio]

hello sir
this is my project....

Thank's for share, is this project working?

 

[A square]

This is ur QUASI 550W Amplifier. .i made it with my way.thanx for this project.
it works very well.

to my all diy,s i want to say apex sir is lord of amps .

thanx sir god bells u.........

 

[apexaudio]

Thank You for building my amp, as I say work every time evan without original pcb.
Regards

 

[A square]

with one pair of 2n3773 what is amp,s wattage.nd pls tell me about transformer for 2 channel .

 

[echobase]

hello sir
this is my project....

You sounded so convincing Mr. Jon and I assumed it really worked. Post me the schematics. This is my email echobase@tm.net.my. Hope to hear from you soon.

Best regard
Albert B.

 

[apexaudio]

with one pair of 2n3773 what is amp,s wattage.nd pls tell me about transformer for 2 channel .

With one pair of 2N3773 you can get output power 100W/4R. 2x35vac transformer 150W for single channel.
Regards

 

[noobie]

Instead 22k use 2x15k in series (30k), and you can drive 2x15",
Regards

apex, you mean 3 pairs of 15k resistors?

 

[apexaudio]

apex, you mean 3 pairs of 15k resistors?

No, this resistor is part of CCS.

 

[vtech]

Could it work with BD711? I have a zillion of those.

 

[apexaudio]

Could it work with BD711? I have a zillion of those.

With +/-40V DC rail voltage it could, and use 4 pairs of outputs (BD711) if you have zilion of them 🙂

 

[RSK]

Sub-Amp

Hi Miles,
Can this quasi amp work for simple subwoofer amp?
I want to have a quick try for my simple sub.

Thanks.......Raj

 

[apexaudio]

Hi Miles,
Can this quasi amp work for simple subwoofer amp?
I want to have a quick try for my simple sub.

Thanks.......Raj

Quasi amp is very good for subwoofer amp.
Regards

 

[RSK]

Quasi amp is very good for subwoofer amp.
Regards

Thank you Miles,
Good to try if that is.

Cheers.

 

[echobase]

I'm convinced with Jon's work and I am ready for the Apex 550 watt class B amp, but need you to clear out two things:

1. the schematic/circuit doesn't fit with the PCB layout, why?
2. which one i have to follow: the schematic or the PCB?

Best regard,
Albert

 

[echobase]

Yo, happy "1 Malaysia" never tought some one back home does interest in building amp.

 

[echobase]

A square/Jon, which one did you use; the schematic or the PCB? Judging on your QUASI 550W Amplifier project, it seem that you follow the schematic.

 

[apexaudio]

I'm convinced with Jon's work and I am ready for the Apex 550 watt class B amp, but need you to clear out two things:

1. the schematic/circuit doesn't fit with the PCB layout, why?
2. which one i have to follow: the schematic or the PCB?

Best regard,
Albert

Go to posts #131 and #132
Regards

 

[RSK]

Yo, happy "1 Malaysia" never tought some one back home does interest in building amp.

Nice to hear.

Raj