1000W Simple PA Amplifier

[tinitus]

 

[apexaudio]

If you have 0V instead 132V you mast revert wires on one trafo.

 

[tinitus]

phasing...good to know, thanks

I thought they were 500VA, but clearly says 6A
but 800VA in series wil be ok

 

[apexaudio]

phasing...good to know, thanks

I thought they were 500VA, but clearly says 6A
but 800VA in series wil be ok

With 2x66Vac voltage 800VA is ok

 

[tinitus]

so far it fits

btw, trafos will be 'immersed' in a sub-chassis below the heatsinks
just hope it wont cause trafo induced hum

 

[wiljj78]

so far it fits

btw, trafos will be 'immersed' in a sub-chassis below the heatsinks
just hope it wont cause trafo induced hum

Nice heatsink

 

[apexaudio]

so far it fits

btw, trafos will be 'immersed' in a sub-chassis below the heatsinks
just hope it wont cause trafo induced hum

You can shield your transformer

 

[tinitus]

Nice heatsink

classA heatsinks
300 x 200mm

8x MJL21193, all 526-527mV
8x MJL21194, all 520-522mV

 

[wendipassundan]

trafo

whether such a transformer can be used also for ba1000

80.40 ac ct 40 80

This transformer is very heavy +- 23kg.

 

[apexaudio]

whether such a transformer can be used also for ba1000

80.40 ac ct 40 80

This transformer is very heavy +- 23kg.

160Vx20A=3200VA?

 

[wendipassundan]

trafo ac 80 ct 80

160Vx20A=3200VA?

yes mister,,, can for stereo?,

 

[apexaudio]

yes mister,,, can for stereo?,

Yes, for BA1200 stereo

 

[thunderjets]

Ok there you go....

woow.. nice layout. but still cant find fuse holder. thanks wiljj78.

 

[wattaniya]

Driver BA1200

hi apex,
is this driver board working?
anyone tested or not?

 

[apexaudio]

hi apex,
is this driver board working?
anyone tested or not?

This pcb design is new, not tested.

 

[AndrewT]

Apex,
could you get the sch in post181 changed to show the corrected resistor @ 1k?

 

[apexaudio]

Apex,
could you get the sch in post181 changed to show the corrected resistor @ 1k?

Ok

 

[Riff]

R10k too hot

sir... R10k very hot to burn at the time played only a few minutes.
2volt bias b to b, and 90vdc supply.
i need your suggestions ?

 

[apexaudio]

sir... R10k very hot to burn at the time played only a few minutes.
2volt bias b to b, and 90vdc supply.
i need your suggestions ? View attachment 351294

10k must be hot (1.5W disipation), you can use 5W resistor.

 

[michaelkiwanuka]

Better to use a cascode medium power transistor instead of R11.