500W PA amplifier with Limiter

[aman khalsa]

marry Christmas to all my DIR,s....

 

[aman khalsa]

marry Christmas to all DIY,s....

 

[engel dela pena]

hi apex audio
greetings want to ask you that can you please tell me if i am
wrong
1 pin 7 of ic TLO72 should go to base of transitor BF422 but 5 no pin is going to base
2 from 5 no pin 10K resitor should be ground
3 1 no pin of ic TLO 72 should go to base of transistor BF423 but 3 no pin is going to base
4 3 no pin should be ground via 10 K RESITOR
PLEASE TELL ME IF I AM CORRECT FOLLOWING SCHEMATIC
hopimg you can help me
thanking you
andrew lebon

hello mate,
which tlo step lay out are you using?
the corrected step lay out is in post923 and 928

 

[engel dela pena]

apex,
in the picture you post the i.c. mounted not as the last corrected lau out,.so the step this picture is not yet tested?

 

[andrewlebon]

hi engel dela pena
greetings check schematic against pcb component layout
after correcting mistakes on negative side negative out voltage is correct
will do positive side now and reply
thanking you
andrew lebon

MERRY CHRISTMAS TO ALL FOLKS ON DIY

 

[wattaniya]

my question is is it b500 need step driver? without step driver any effect?
which speaker protection is suitable for b500?
pls post the b500 correct pcb layout in pdf and speaker protection.
thank u for diy members.

 

[irvynejay]

my question is is it b500 need step driver? without step driver any effect?
which speaker protection is suitable for b500?
pls post the b500 correct pcb layout in pdf and speaker protection.
thank u for diy members.

B500 can run without step driver ,,step driver is just an upgrade so b500 become h class,,about protect circuit its on the thread and i use it for my b500 and h900 works great

 

[wattaniya]

There are lots of protect circuit in this forum . so which one u use? if u can post the pcb layout it is very usefull.
thank u for your reply.

 

[irvynejay]

protect circuit APEX

There are lots of protect circuit in this forum . so which one u use? if u can post the pcb layout it is very usefull.
thank u for your reply.

APEX protection circuit can be use in any amps

 

[wattaniya]

thank u for the spaeker protection pcb . but i read in this thread this is for h900 not suitable for b500. is it ok for b500?

 

[irvynejay]

yes im using it on my b500 and h900

 

[wattaniya]

how about this stereo protection so no need extra board.

 

[irvynejay]

yes it works too ,,but for me i make one for each channel

 

[wattaniya]

what is the pcb size?
what about this protection bcb?
which power supply u use?
i am going to try the regulated power supply.i attached it.
which relay uusing?

 

[wattaniya]

any soft start circuits for b500?

 

[irvynejay]

what is the pcb size?
what about this protection bcb?
which power supply u use?
i am going to try the regulated power supply.i attached it.
which relay uusing?

i think that this circuit has softsatrt and protection circuit is for b250 i think ,,and the other is regulated psu for b500.ypu must ask APEX AUDIO for clarification

you can use that psu with softstart for b500

My unfinish PSU for B500 with Softstart i cut the protection Circuit

 

[irvynejay]

simple soft start .5sec delay

here my simple soft start no extra trapo needed i found on the net

 

[wattaniya]

can u post the pcb layout. and the parts layout. is it good for b500?

 

[irvynejay]

delay

ok here we go

 

[wattaniya]

thank u. what is the relay value?