1000W Simple PA Amplifier

[apexaudio]

Hey dear Apex...i recently build ur amp and tested with 8ohm 15" sub with +-56v dc and it was really good and clean and powerfull....i just have a quest about the bias current and the 2 pots what pot should i care about to have the appreciated bias current and how mush it should be (bias current)..i made i short video while testing it and here is the youtube link hope u enjoy 🙂 best regard and keep forward man peace 🙂
1200w my diy class ab amplifier testing - YouTube

Nice work,
Regards

 

[yosha]

Nice work,
Regards

thank u sir..nut u didnt tell me about the bias detailes 🙂

 

[boss2009]

20amps will be good to handle 2 channel
Regards

Thank very much Sir Mile for clarification.

Best Regards

 

[manaka]

Hi Mr. Apex, please help me, I'm assembling BA1200 but found a problem in the driver C5200/A1943 very hot, but not given the load and input signal.

 

[apexaudio]

Hi Mr. Apex, please help me, I'm assembling BA1200 but found a problem in the driver C5200/A1943 very hot, but not given the load and input signal.

Drivers must be on same heatsink with outputs, can you post pictures?

 

[Bushulo]

Someone please help in giving details setting up bias current and off set voltage for apex BA1200.

 

[tinitus]

a few important materials I needed for mounting transistors 🙂

 

[vedmitraa]

schematic of the version with bias and d.c. offset preset.

Is there any schematic of this version with both preset, bias and d.c. offset.

 

[tinitus]

I must be crazy doing this 😱 if I may say so myself 😛

btw, studs are 4mm and goes between the transisters

 

[tinitus]

3mm screws to make sure the transisters are positioned correctly and not falls out

 

[vedmitraa]

Hello Mr. Miles,
Again I am writing the same ,Is there any schematic of this version with both preset, bias and d.c. offset.Will anybody please help me.

 

[tinitus]

not sure if this one helps you

 

[AndrewT]

3mm screws to make sure the transisters are positioned correctly and not falls out

Nice detail.

 

[tinitus]

thanks

isolation pads also ready now
not ideal, but stays in place too 😛

 

[vedmitraa]

Thanks Mr. Tinitus,
A small doubt , in your photo the yellow circled res. you have shown value 1 k and in other it is 470 ohm, which is correct.

 

[tinitus]

.... which is correct.

don't know, I'm no expert

may be differences coming from original curcuit showing fixed resistor value to give a figure
and actual practical curcuit having adjustable pot ... and end being close to the same, once adjusted

 

[wiljj78]

Thanks Mr. Tinitus,
A small doubt , in your photo the yellow circled res. you have shown value 1 k and in other it is 470 ohm, which is correct.

Resistor is 470R, offset Pot is 1K.

 

[pose pro elc]

Is recommended when BA1200 is in bridge?

 

[apexaudio]

Is recommended when BA1200 is in bridge?

Use +/60V for BA1200 in bridge and U can use 4 Ohns load.

 

[pose pro elc]

Okay, when compared with the apex H900 with voltage 120VAC 60 & BA 1200 .. with apex 60VAC bridge mode .. thanks in advance ..