900W H-class PA Amp with Limiter

[mkubawat]

PROTECT CONNECTIONS

thanks for reply mkubawat.
i didn't understand, can u check the image, is it correct?

here is connections🙂

 

[ravi79]

hi apex audio please post 2sc5200 used sub power amp circuit pcb

 

[wattaniya]

Hey Niz, only the positive out of your amp is connected to protection circuit, the negative is directly connected to your negative speaker terminal.

thanks for reply junie.

 

[wattaniya]

here is connections🙂

thanks for reply mkubawat.
u mention the transformer is 1.5ampere. so the rectifiers are 1ampere.
is it ok to use 1ampere transformer for this.

but apex mentioned 500ma transformer.

 

[eesbiboi]

check this schematic

what are these diodes in red circle???...
are these 5v 1/2w zener diodes???

regards
ees

 

[mkubawat]

thanks for reply mkubawat.
u mention the transformer is 1.5ampere. so the rectifiers are 1ampere.
is it ok to use 1ampere transformer for this.

but apex mentioned 500ma transformer.

Transformer ratings depend on type of relay .
you can use 1amp transformer. If you hear relay chattering sound at start-up time, then need to increase ampere of transformer , otherwise it's OK.

 

[mkubawat]

thanks for reply mkubawat.
u mention the transformer is 1.5ampere. so the rectifiers are 1ampere.
is it ok to use 1ampere transformer for this.

but apex mentioned 500ma transformer.

Transformer ratings depend on type of relay .
you can use 1amp transformer. If you hear relay chattering sound at start-up time, then need to increase ampere of transformer , otherwise it's OK.

 

[Tekko]

eesbiboi, those are 5 volt zener diodes and part of the railswitching circuit.

 

[wattaniya]

Transformer ratings depend on type of relay .
you can use 1amp transformer. If you hear relay chattering sound at start-up time, then need to increase ampere of transformer , otherwise it's OK.

hi mkubawat.

when i power on this sometimes the relay is connecting without delay.
sometimes after 5sec the relay is connecting.
power off 1sec delay.
what is the solution.

 

[mkubawat]

hi mkubawat.

when i power on this sometimes the relay is connecting without delay.
sometimes after 5sec the relay is connecting.
power off 1sec delay.
what is the solution.

Tell me, soft start circuit used or not

 

[wattaniya]

Tell me, soft start circuit used or not

hi mkubawat.
i am not using soft start.
now i think ok for the 5sec delay. the relay is connecting after 5sec.
but when i off the amp with low volume, big sound is coming like (top) .

 

[mkubawat]

hi mkubawat.
i am not using soft start.
now i think ok for the 5sec delay. the relay is connecting after 5sec.
but when i off the amp with low volume, big sound is coming like (top) .

There are two reason in my mind for this type of problem
1. if sound comes immediate with turn of then it is due to loose contacts in AC side wiring or main switch contacts
2. if after 2-3 sec delay then check amp's pre IC supply please try to stabilize it.
tell me if not solved

 

[wattaniya]

There are two reason in my mind for this type of problem
1. if sound comes immediate with turn of then it is due to loose contacts in AC side wiring or main switch contacts
2. if after 2-3 sec delay then check amp's pre IC supply please try to stabilize it.
tell me if not solved

thanks mkubawat.
i checked on off main switch.
problem is on off switch.
now no on off thumbs. no sounds on off.
thank u very very much for your cooperation.

 

[STAGE4]

😀

 

[STAGE4]

use mjl21193,mjl21194 for the outputs and drivers & you can use two types of relays for the speaker protection relay,(12V)..good sound...enjoy it..

 

[wattaniya]

use mjl21193,mjl21194 for the outputs and drivers & you can use two types of relays for the speaker protection relay,(12V)..good sound...enjoy it..

hello cheshtap.
where can i buy mjl21194 numbers in sri lanka , i mean shop address.
thanks.

 

[mkubawat]

Dear CHESTAP

Your work is appreciable , but where are schematic & supply detail.

 

[engel dela pena]

😀

 

[mkubawat]

this schematic does not match

 

[eesbiboi]

eesbiboi, those are 5 volt zener diodes and part of the railswitching circuit.

thank you dear tekko...

now im wondering which schema to follow...

i got this other one from a different forum posted also by sir chestap
seems to have a bit of insimilarity

regards
ees...