500W PA amplifier with Limiter

[sekhar]

can we see the pic of the transformer

apex

sir,
i bought all the b500 components...i noticed that some components in the schematic differ from the pcb placement guide...
i need to know which one to follow...should i follow the schema or the pcb???...im using two psu for testing 1 is 50 0 50vac @20amps 2nd is 55 0 55vac @25amps...

tnx...
regards...

why do need such amp rating for ur transformer........ can we have a look at the pictures of ur transformer

regards
sekhar

 

[eesbiboi]

why do need such amp rating for ur transformer........ can we have a look at the pictures of ur transformer

regards
sekhar[/QUOT

i once built an amp with this psu rating with EI core...i thought of using it again...

 

[eesbiboi]

b500

my b500...
ready for testing...
only thing left to do is attach heatsinks...

 

[andrewlebon]

hi apexaudio
greetings can this dc protector be used with other amplifiers?
mainly the short circuit protection
thanking you
andrew lebon

 

[apexaudio]

hi apexaudio
greetings can this dc protector be used with other amplifiers?
mainly the short circuit protection
thanking you
andrew lebon

Yes, but you must have overcurrent detector on amp pcb, like B500.
Regards

 

[mihailo]

Hi, Apex.
I have finished one shannel of B500.
Here are the pictures.
Regards

 

[mihailo]

More pictures...

 

[mihailo]

Apex120 and B500 with heatsink and my heating fan solution.

 

[eesbiboi]

dc on output

apex...
sir... i powered on my b500 circuit...
i had dc on output about 7v...
i put 2 330ohms 10watts resistor on xformer primary...
power trannies seemed to warm up...but dc occur on output...hum on spkr...no audio on output...
what seem to be the problem???...
pls help...
tnx...
regards...

 

[apexaudio]

apex...
sir... i powered on my b500 circuit...
i had dc on output about 7v...
i put 2 330ohms 10watts resistor on xformer primary...
power trannies seemed to warm up...but dc occur on output...hum on spkr...no audio on output...
what seem to be the problem???...
pls help...
tnx...
regards...

Do not connect speakers if you have DC on output. If you not forget to connect wire jumper (red line) on botom side of pcb or GND on input with separate wire from PSU, try to measurment voltage on point as I suggest,
Regards

 

[eesbiboi]

Do not connect speakers if you have DC on output. If you not forget to connect GND on input with separate wire from PSU, try to measurment voltage on point as I suggest,
Regards

i removed spkrs from amp...i already hve separate wire fromm input to ground of psu...w/c post can i see your voltage suggestions???...

 

[apexaudio]

i removed spkrs from amp...i already hve separate wire fromm input to ground of psu...w/c post can i see your voltage suggestions???...

It's same as for H900 post #405 in thread:
http://www.diyaudio.com/forums/solid-state/162408-900w-h-class-pa-amp-limiter-41.html
Regards

 

[mihailo]

I also had DC voltage about 8V, when start amplifier first time,
but when I turn it on after few seconds again voltage was -35mV.
And now is 35-40mV and amplifier works ok.

 

[eesbiboi]

I also had DC voltage about 8V, when start amplifier first time,
but when I turn it on after few seconds again voltage was -35mV.
And now is 35-40mV and amplifier works ok.

7vdc on output doesnt decrease...stays as it is as it was first turned on...
output trannies turn on hot in less than a minute...

 

[rhodrich]

@esobi

how much the cost of the power transistor you buy? where you want to used the amp for sub woofer?

 

[eesbiboi]

@esobi

how much the cost of the power transistor you buy? where you want to used the amp for sub woofer?

i bought those trannies for less than 80pesos each...
im planning to use them for mids...hope to finish this project...
im facing some kinda' prob here...i still dont know what to do...

 

[mihailo]

Post some pictures if you can.
Look at GND wiring.
What voltage are you using for this amplifier?

 

[eesbiboi]

Post some pictures if you can.
Look at GND wiring.
What voltage are you using for this amplifier?

i took pics this morning
i used my fon to capture images
i guess its not that clear...

 

[andrewlebon]

hi eesbiboi
greetings how much power do you use for mid and what type
of speakers do you use

thanking you
andrew lebon

 

[eesbiboi]

hi eesbiboi
greetings how much power do you use for mid and what type
of speakers do you use

thanking you
andrew lebon

i plan to use 2 MANEX 15" 600w speakers(instrumental) per channel...