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500W PA amplifier with Limiter
500W PA amplifier with Limiter
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Old 19th June 2017, 12:55 AM   #3281
saminnografix is offline saminnografix  Philippines
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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
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Old 20th June 2017, 09:44 AM   #3282
Zinyx is offline Zinyx  Poland
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Quote:
Originally Posted by Luuker View Post
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.
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Old 20th June 2017, 10:22 AM   #3283
pallab is offline pallab  India
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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.
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Old 29th June 2017, 01:58 PM   #3284
herimanana is offline herimanana  Madagascar
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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 !!
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Old 6th July 2017, 07:41 PM   #3285
pallab is offline pallab  India
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Quote:
Originally Posted by wiljj78 View Post
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.
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Old 7th July 2017, 04:42 AM   #3286
Dacz is offline Dacz  Philippines
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read darasheet

mje340/350 Ic 500mA
mje15032/33 Ic 8A
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Old 8th July 2017, 06:41 PM   #3287
pallab is offline pallab  India
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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 ?
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Old 10th July 2017, 12:02 PM   #3288
pallab is offline pallab  India
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https://m.youtube.com/watch?feature=share&v=myLK3RT_SL0

B500 with 2 pair output.
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Old 13th July 2017, 08:56 AM   #3289
apexaudio is offline apexaudio  Serbia
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B500+SMPS
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Old 13th July 2017, 07:01 PM   #3290
stewin is offline stewin  Kenya
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Quote:
Originally Posted by apexaudio View Post
B500+SMPS
nice work sir apex
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