500W PA amplifier with Limiter

[apexaudio]

yes +/-15 & ref not forgotten
hope this is fine

Yes, U can use this pcb without diode bridge for MV.
Regards

 

[engel dela pena]

tlo72 step
apex,
this Ou1 grey color .1uf? what voltage? 100v mylar is this ok?
the Ou1 white?what voltage?
and does this 47 in pf?ceramic

 

[apexaudio]

tlo72 step
apex,
this Ou1 grey color .1uf? what voltage? 100v mylar is this ok?
the Ou1 white?what voltage?
and does this 47 in pf?ceramic

0u1 grey color must be 250V,
0u1 white color 63V,
47pF ceramic,
Regards

 

[mane]

hi everyone! heres my b500, i had it tested and its loud! and i like the way it sounds...i did some component replaced since were too far from the city and components like mje340 and mje15032 is hardly available and a bit of pcb reworking...

 

[apexaudio]

hi everyone! heres my b500, i had it tested and its loud! and i like the way it sounds...i did some component replaced since were too far from the city and components like mje340 and mje15032 is hardly available and a bit of pcb reworking...

What did you use instead MJE, would you post some pictures?
Regards

 

[apexaudio]

Many diyers at Philippines...

 

[electra_ina]

.......Soft-start

Hi..Apex...two question:
1. For soft-start supply 30VDC..are used separate transformator or from extra CT (20vac) main transformer??
2. For protector H900 (with TL 074) are used separate transformer too??

Sorry it's elementary question....
Pozdrav...

 

[apexaudio]

Hi..Apex...two question:
1. For soft-start supply 30VDC..are used separate transformator or from extra CT (20vac) main transformer??
2. For protector H900 (with TL 074) are used separate transformer too??

Sorry it's elementary question....
Pozdrav...

Protection pcb use 2x18v 1A ac from main transformer or smal separate transformer, and from protection board you can use +/-15v without gnd for soft-start.
Pozdrav

 

[east electronics]

hello Apex ... been looking arround your threads ... for quiet a long time now and i like very much that most your stuff is simply made

any day i will produce one of your amps .... couple of questions though
1) have you got anything to do with smps projects
2) if so would you like to discuss a project privatelly ??

kind regards sakis

 

[electra_ina]

Protection pcb use 2x18v 1A ac from main transformer or smal separate transformer, and from protection board you can use +/-15v without gnd for soft-start.
Pozdrav

Thanks Apex...I understood now...
Pozdrav

 

[engel dela pena]

Many diyers at Philippines...

apex,
yes the philippines are verry much happy because you came along at diy community

 

[apexaudio]

hello Apex ... been looking arround your threads ... for quiet a long time now and i like very much that most your stuff is simply made

any day i will produce one of your amps .... couple of questions though
1) have you got anything to do with smps projects
2) if so would you like to discuss a project privatelly ??

kind regards sakis

I don't use SMPS power supply, but I will soon,
Regards

 

[Rafael S. M.]

I wonder if this amp can be used in a truly professional system, I hope to use it for the middle way (between 100Hz and 2kHz)

He really can handle the heavy lifting? And sound? the good is that it already has limiter, so it's a big step, and as other protections? (Like DC and short?)

 

[apexaudio]

I wonder if this amp can be used in a truly professional system, I hope to use it for the middle way (between 100Hz and 2kHz)

He really can handle the heavy lifting? And sound? the good is that it already has limiter, so it's a big step, and as other protections? (Like DC and short?)

See posts #241 and #111,
PA Protect include:
1 Anticlick 5sec delay
2 DC cut-out
3 Thermal cut-out on 90deg
4 Fan high speed on 60deg
5 Over current protect (power-on reset)

Conectors:
1 2x18V 500mA AC
2 +/-15V DC stab for XLR circuit
3 PRO overcurrent detect
4 Protect LED
5 Thermal sensor BD241C as diode on heatsink
6 24V DC Fan cooler (12V for low speed)
7 Speaker IN/OUT

Regards

 

[apexaudio]

Pcb for this PA protect and another protection for Hi-Fi amps you can find here:
http://www.diyaudio.com/forums/solid-state/164093-100w-ultimate-fidelity-amplifier-10.html
Regards

 

[Rafael S. M.]

Thank you, I will build it with a transformer of 1200VA (for both channels) is good, ok?

One more thing, trasistores 2n5401 2N5551 can be substituted for some BC's more common, for example, BC556 ...

 

[apexaudio]

Thank you, I will build it with a transformer of 1200VA (for both channels) is good, ok?

One more thing, trasistores 2n5401 2N5551 can be substituted for some BC's more common, for example, BC556 ...

1200VA for both channels is ok,
2N5401/2N5551 can be substituited with MPSA92/MPSA42,
Regards

 

[Rafael S. M.]

ok, MPSA is easy to find
I will have no loss in quality is not it?

two other questions:

the limiter, LDR is a normal and a normal LED, some particular color?

500W at 4R?

 

[apexaudio]

ok, MPSA is easy to find
I will have no loss in quality is not it?

two other questions:

the limiter, LDR is a normal and a normal LED, some particular color?

500W at 4R?

All answers is in my threads. Better read if you want to build.
You will have not loss in quality with MPSAs.
Regards

 

[engel dela pena]

apex,
this is my h900v2 board modified for b500 purpose
please kindly check if my jumpers are correct
regards