500W PA amplifier with Limiter

[AndrewT]

you still don't get the point.
I advocate protection.
I suggest the Triac shorting circuit be moved from output to supply rails.

I am not telling anyone to remove protection. That is completely against my philosophy.

 

[apexaudio]

you still don't get the point.
I advocate protection.
I suggest the Triac shorting circuit be moved from output to supply rails.

I am not telling anyone to remove protection. That is completely against my philosophy.

That kind protect circuit will be better, and anybody who want feel free to used.
Regards

 

[apexaudio]

I think in a future amplifier pcb will integrated with protection circuit, in that case anyone who build amplifier must build protect also. Maybe PSU and heatsink will be on pcb also...

 

[apexaudio]

Protect

This is recomended protect.

 

[electra_ina]

Hi..Apex...in protect TR BD241 can replace with another TR?? Because very hard to find in my place..Example replace with TIP41..
Regards,

 

[apexaudio]

hi..apex...in protect tr bd241 can replace with another tr?? Because very hard to find in my place..example replace with tip41..
Regards,

This transistor used as thermal sensor (diode) in this protect circuit, base and colector conect together as anode and emiter is catode.
bd241 > tip31.

 

[electra_ina]

Thanks Apex..very-very quick respons...

 

[apexaudio]

Thanks Apex..very-very quick respons...

Can you attach picture of your work?
Regards

 

[electra_ina]

This protector kit:
[IMG=http://img202.imageshack.us/img202/1539/protektor.jpg][/IMG]

 

[apexaudio]

This protector kit:
[IMG=http://img202.imageshack.us/img202/1539/protektor.jpg][/IMG]

Nice work

 

[electra_ina]

And this PA 900 without step up driver, because very hard to find IR 2117. I will try to PA500:
[IMG=http://img52.imageshack.us/img52/761/kitclassh1.th.jpg][/IMG]

 

[apexaudio]

And this PA 900 without step up driver, because very hard to find IR 2117. I will try to PA500:
[IMG=http://img52.imageshack.us/img52/761/kitclassh1.th.jpg][/IMG]

You ca use H900 as B500, just put jumper D-S on place fets, and use only HV rails.

 

[engel dela pena]

And this PA 900 without step up driver, because very hard to find IR 2117. I will try to PA500:
[IMG=http://img52.imageshack.us/img52/761/kitclassh1.th.jpg][/IMG]

electra ina
how can you make those beautiful pcb,no lines break even in very thin lines?
and no shorted lines on i.c.'s n Q's
what is so special about your procedure in making pcb's?

 

[apexaudio]

electra ina
how can you make those beautiful pcb,no lines break even in very thin lines?
and no shorted lines on i.c.'s n Q's
what is so special about your procedure in making pcb's?

I think electra ina use 'sieve-print' for make pcb.

 

[engel dela pena]

yes i see on youtube
YouTube - pcb printer bez boje

 

[engel dela pena]

apex
how to power up b500
first time powering up
except the slow turn on
do i need to place 100r to fuse?

 

[electra_ina]

I make it :
1. I print layout PCB with precision measure Apex
2. I transfer to silk screening
3. So, I painting from silk sceening to PCB
4. Finally, etchink with ferryclorida..
Sorry, my english...

 

[engel dela pena]

I make it :
1. I print layout PCB with precision measure Apex
2. I transfer to silk screening
3. So, I painting from silk sceening to PCB
4. Finally, etchink with ferryclorida..
Sorry, my english...

what particular ink are you using
that is not a ordinary silk screen embosed ink

 

[engel dela pena]

apex,
almost complete
how about first powering up?
100r resistor remove fuse?
please help

 

[apexaudio]

apex
how to power up b500
first time powering up
except the slow turn on
do i need to place 100r to fuse?

Do not powering up without heatsink, drivers transistor work in class A.
Don't forget wire jumper on coper side pcb.
Don't forget to connect input GND.
Use 150R 20W on primar ac transformer.
U can use 100R instead fuses, I don't, but I made 1600 amplifiers still now.
Check DC offset before connect speakers, use 100uF bipolar if U want test amplifier without protect.
Good luck!
Regards