500W PA amplifier with Limiter

[saminnografix]

hi diyers'
may i ask any idea on my b500 it works well but.
the turn on ploop strikes +/-30VDC
so i have used the h900 protect stereo with tip31 thermal diodes.
there is still about +/-4.5VDC which i think not good for the speakers

 

[Zinyx]

Hi. What is the value of resistor instead of NSL32? MJE340 / 350 is the need for a cooler?

NSL32 can be replaced with 47k resistor and LED for 'clip' indicate, if you don't want use limiter,

MJE340/MJE350 need some small heatsink.

 

[pallab]

One channel done for test .Audio quality superb .I have used MJL3281/MJL1302 (2pair) for test.But I will use 4 pair to get 500w at 4 ohms.

 

[herimanana]

hi folks!

I'd like a advice from you all.

I want a good quality HI-FI performance amplifier and will have a power like this B500 !! I like the power of this B500 but need more HI-FI performance !!

Any circuit please !!!

A new design of b500 may be.

thank you all !!

 

[pallab]

Mr. Mile,

I'm planning to upgrade my B500 to TEF, is this correct?

Regards,

I want to change predriver to mje15032/33 pair driver TTC5200/1943 pair and 5 pair mjl3281/1302 as outputs...can anyone tell me mje340/350 are equipment to mje15032/33 pair ? because I saw for tef version there all mje15032/33 instead of mje340/350.

 

[Dacz]

read darasheet

mje340/350 Ic 500mA
mje15032/33 Ic 8A

 

[pallab]

I have a question.can i add one extra pair i.e total 5 pair mjl3281/1302for standard version of apex b500 without changing any component?And what will be optimal bias current for mjl3281/1302 pair at 75v dc ?

 

[pallab]

https://m.youtube.com/watch?feature=share&v=myLK3RT_SL0

B500 with 2 pair output.

 

[apexaudio]

B500+SMPS

 

[stewin]

B500+SMPS

nice work sir apex

 

[44250]

really great work,and also smps!

 

[thimios]

B500+SMPS

Hi Mr,can you give more details about smps?

 

[pued]

good amplifier.

 

[saminnografix]

hi to all may i ask if i can use my 60-0-60AC trafo for B500 orig design 8 outputs using 1943/5200 or shall i use MJL/MJW for this voltage?
thanks
regards...

 

[AndrewT]

Compare the SOA curves from the datasheets.

 

[sajti]

hi to all may i ask if i can use my 60-0-60AC trafo for B500 orig design 8 outputs using 1943/5200 or shall i use MJL/MJW for this voltage?
thanks
regards...

Use MJL, or NJW 21193/94

Sajti

 

[Kay Pirinha]

Use MJL, or NJW 21193/94

Sajti

...or MJL/MJW/NJW 21195/96, which show about the same specs, but are (why?) somewhat cheaper than their 93/94 counterparts.


Btw, any objections against faster devices here, such as MJL4281A/4302A?


Best regards!

 

[apexaudio]

https://www.onsemi.com/pub/Collateral/NJW0281-D.PDF

 

[saminnografix]

thank you so much for the reply...
especially to Mr. Mile...
i am sorry for asking too much, it is my avidity to these things constraining me to solicit advice, learning electronics through ethernet is difficult but because of the support of this forum all my apex designs are working great compared to available hi fi or mid PA in the area. (b500, sr200, ax14, ax20) next in mind is the Hclass, but i have to go to school for now soon i'll do it after parts are complete.

best regards...

sam

 

[pallab]

B500 Stereo.

B500 stereo.Not Tasted....I am biggner in pcb designing .....