500W PA amplifier with Limiter

[eesbiboi]

eesbiboi,
MUR1620,(hard ti find)but.......
any 100v 8a will do,(back to back diode),
I use D5LC0U,from scrap
and.....,
BF422/423,... ecb ....(hard to find)....but
MPSA92/93,.... ebc .... will do (different pin out)

engel...

i see...this diode is a bit hard to look for...
i might also find it hard to look for substitute little trannies...
anyway...
thanks for the info...
i'd first have to build another aB amp before i proceed building step drive...

regards...
ees

 

[loganati]

Hello Apex,How reliable is the short-circuit protection, such as the transistors do not die when the output is shorted?

 

[apexaudio]

Hello Apex,How reliable is the short-circuit protection, such as the transistors do not die when the output is shorted?

Short-circuit protect is never 100% reliable on high power amplifiers, only short-circuit protect from this thread: http://www.diyaudio.com/forums/solid-state/162081-dc-servo-mosfet-amplifier-3.html can be 100%reliable.
Regards

 

[andrewlebon]

hi apexaudio
greetings please can you check coolets pcb for component value
1 R24 R25 SHOULD BE 2.2K INSTEAD OF 6.8K
2 R4 SHOULD BE 43K INSTEAD OF33K
3 C3 C4 2.2UF NO 2.2UF ON COOLETS PCB
4 R5 47K
THANKING YOU
ANDREW LEBON

 

[coolet]

sorry for the mistake 😀 let me know if there is other error... better to mark the parts with error.

 

[andrewlebon]

hi coolet
greetings cool pcb design
1 43K SHOULD GO DOWN IN PARALLEL WITH 33PF
2 33K SHOULD GO DOWN
will keep you posted if anything amiss should finish pcb today
thanking you
andrew lebon

 

[andrewlebon]

hi coolet
greetings sorry forgot
1 6K8 2WATT 4K7 2WATT AT SIDE OF .33 5 WATT SHOULD BE CHANGED TO 2.2K 2 WATT
THANKING YOU
ANDREW LEBON

 

[coolet]

the position of 43k and 33k was change in my layout and that is correct. the values I put before was based on the the attach original apex layout.

 

[irvynejay]

2 Channel B500 with protect connected

2 channel are now working with protect loaded with 2x200wats sound tech speaker with mixer 12 channel,VERY CLEAR SOUND TY APEX AUDIO

 

[apexaudio]

2 channel are now working with protect loaded with 2x200wats sound tech speaker with mixer 12 channel,VERY CLEAR SOUND TY APEX AUDIO

Thank's for the pictures, thermal diode BD241C(TIP31C) must be on main heatsink.
Regards

 

[irvynejay]

yes when i finally mounted it on the chassis i will put it on the heat sink. when B500 fully done i DIY H750 or H900 soon..i am very thankful to you apexaudio

ALL Chassis And Speaker boxes will be named by Author APEXAUDIO: for Credits

 

[apexaudio]

yes when i finally mounted it on the chassis i will put it on the heat sink. when B500 fully done i DIY H750 or H900 soon..i am very thankful to you apexaudio

ALL Chassis And Speaker boxes will be named by Author APEXAUDIO: for Credits

Do you planing to build some of my speakers boxes?

 

[rhodrich]

Bass from B500 have very good definition, and I like it, but you need 'CREST' style like VERTEX for 'real hard bass' or somethin simplier like this:
Regards

sir apex do you have simplier to build high power amp.for sub woofer used

 

[apexaudio]

sir apex do you have simplier to build high power amp.for sub woofer used

This amp is good for sub, and in bridge mode (post #206) it's very powerful
http://www.diyaudio.com/forums/solid-state/167394-quasi-amplifier-beginners.html
Regards

 

[irvynejay]

speaker boxes

Do you planing to build some of my speakers boxes?

yes i will make your speaker box design,can you share some design except the one's you posted??

regards

 

[apexaudio]

yes i will make your speaker box design,can you share some design except the one's you posted??

regards

Yes but other speakers designs are ordinary.

 

[irvynejay]

ah ok miles Thanks ,,BTW i notice 2 power amps running with volume at 50% is it normal NE5532 is heating up?? not too hot i can touch it with my fingers

 

[noobie]

2 channel are now working with protect loaded with 2x200wats sound tech speaker with mixer 12 channel,VERY CLEAR SOUND TY APEX AUDIO

irvinejay,

your pcb looks nice, what kind of paper or material did you use on printing in pcb?

thanx

 

[irvynejay]

photo paper

irvinejay,

your pcb looks nice, what kind of paper or material did you use on printing in pcb?

thanx

i used photo paper lazer toner printer and heat press machine, home flat iron will work

add me on yahoo bigay ko hard copy and how to make it work

irvynejay@yahoo.com

 

[noobie]

i used photo paper lazer toner printer and heat press machine, home flat iron will work

add me on yahoo bigay ko hard copy and how to make it work

irvynejay@yahoo.com

hi, ive just finish adding you in my contacts, my email kate_shannell@yahoo.com

Thanx in advance