1000W Simple PA Amplifier

[tinitus]

don't know
should I be worried about it ?

I was just interested to hear if there would be other reasons for choosing diode type, other than simple power specs

and besides, paying 50 cents more or less for diode won't ruin my budget

 

[TonyTecson]

come to think of it after building so many amps,
i never seen any of those diodes fail at all...
so i never worried about them....
i have even built amps without those diodes....

 

[AndrewT]

The 1n540x is much bigger and requires much bigger through holes for mounting.

I also fit 1n4003 across the first decoupling caps (after fuses, if fitted). This protects against accidental mis-wiring of the PSU cabling (it turns on the light bulb, or blows the close rated mains fuse).

These four 2cent, (1.5p) diodes are life savers.

 

[tinitus]

for the 2SC5200/2SA1943 driver stage, I suppose Fairchild devices will be ok

due to the almost 100% non inductive construction, a power thick film appears attractive for the 1R emitter resistor
and not too costly either
but is it ok for this position ?

 

[sajti]

for the 2SC5200/2SA1943 driver stage, I suppose Fairchild devices will be ok

Any of them would be OK.

Sajti

 

[AndrewT]

..........................due to the 100% non inductive construction,...............

How did you arrive at this conclusion?

 

[tinitus]

it's thread crap, but I suppose you can find small amounts of induction almost everywhere

now corrected to ... almost 100% non inductive construction

 

[tinitus]

progress ... super inductive 1ohm emitter resistors, and cheapest I could find

 

[apexaudio]

BA1000

 

[sajti]

BA1000

Is that heatsink enough for 1000W class AB?

Sajti

 

[tinitus]

Is that heatsink enough for 1000W class AB?

Sajti

forced air cooling
possible only with the protection curcuit shutting down if fan fails or amp is overloaded

or maybe the pink panther color is something secret

 

[sajti]

forced air cooling

I know, but this heatsink even small with forced cooling too.

possible only with the protection curcuit shutting down if fan fails or amp is overloaded

Yes, the protection will help to avoid the failure resulted by the overheating. However the amplifier will stop, and this is not a good solution for professional application.

 

[andrewlebon]

overload detector for 1000 watt AB CLASS

Hello
greetings can anyone share overload and low impedance detector for this amp cabinets are ready supply pcb has clip dc protect temprature shutdown
filter caps would be 15000 uf 4 caps only wish if overload detector circuit can be added
warm regards
andrew

 

[tinitus]

... amplifier will stop, and this is not a good solution for professional application.

wouldn't testing and knowing your gear help avoid that ?

but are anyone running amps at full blast clipping ?

 

[andrewlebon]

BA1200

wiring in progress

 

[sajti]

but are anyone running amps at full blast clipping ?

The maximum dissipation of the class AB amplifier, is at the 33% of the maximum output power, and not at the clipping....

Sajti

 

[AndrewT]

Worst case power dissipation is when driving a reactive load, not when driving a test resistor.

 

[tinitus]

.... solution for professional application.

I expect professional application means active crossovers and multiple amps ?

 

[sajti]

I expect professional application means active crossovers and multiple amps ?

No, that means, that You make money with the amplifier.

Sajti

 

[tinitus]

then it's probably much cheaper to buy plug and play stuff

personally I only think of this as a hobby, and mostly about having fun
saving money here will not be easy
but andrelebon is clever and skilled
he might save a penny or two