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Old 29th May 2011, 04:16 AM   #321
mathez is offline mathez  Indonesia
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thanks to Apex&Alex for this SR200
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Old 29th May 2011, 04:14 PM   #322
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very nice amp
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Old 5th June 2011, 01:07 PM   #323
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Default Cooling needed?

I have built one SR200 and have it running on +/- 70V.
I can set bias for it to be at 100mA (10Ohm resistors do not go up in flames).
However, the MJE 340/350 all get very hot. During short up-times I did some measuring and it seems that each of these MJE's has approx 67V between E-C and runs some 10mA. Should these T's get warm with these numbers? Should I heatsink them (I see heatsinks on them in some builds.
Or does this mean that there is an error in my build?
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Old 6th June 2011, 06:40 AM   #324
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Quote:
Originally Posted by apexaudio View Post
This buffer can be use instead preamp.
sir apex i want to make a pcb for your buffer but it seems that 2n5462 symbol is not meant for transistor and also symbol for fet i dont know which one is source and which one is drain.symbol for fet is not clear.please can you give us the correct schematic.thank you..
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Old 6th June 2011, 12:24 PM   #325
alex mm is offline alex mm  Europe
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.....schematic for preamplifier with fet , terminal identified ... Sir Mile can tel us if I'm correct .
Alex.
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Old 8th June 2011, 02:32 AM   #326
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Quote:
Originally Posted by apexaudio View Post
For more outputs you must use triple darlington topology. Maximum power can be 750W/4R, and +/-110V rail voltage.
sir mile

can you please show to us how to implement triple darlington topology...so we can try to feed the amp with +/-110v for 750w max output...

thanks


regards
ees...
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Old 8th June 2011, 08:17 AM   #327
amptech is offline amptech  Scotland
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Quote:
Originally Posted by dentarthur View Post
I have built one SR200 and have it running on +/- 70V.
I can set bias for it to be at 100mA (10Ohm resistors do not go up in flames).
However, the MJE 340/350 all get very hot. During short up-times I did some measuring and it seems that each of these MJE's has approx 67V between E-C and runs some 10mA. Should these T's get warm with these numbers? Should I heatsink them (I see heatsinks on them in some builds.
Or does this mean that there is an error in my build?
it would be best if you fitted heat sink tab's for the mje340/50's to aid there cooling...
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Old 8th June 2011, 05:19 PM   #328
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Default apex regulator

apex i make car smps and connect to your regulator.i want to use+-65v,what suitable voltage should i produce from smps and than regulate using your regulator?or have calculation.because i confuse which better input 90v regulate to 65v or input 75v regulate to 65v.
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Old 28th June 2011, 06:32 AM   #329
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Default Cooling needed?

Anyone else done this too?
I run SR200 on +/- 70V and found that 5 transistors get pretty hot. It all works just fine, however, I made some cooling on the MJE transistors and the 2 BC550's that connect to the + via the 100ohm resistors (see picture).

Isn't it strange that the 2 BC550's on the '-' side do not get as hot as the ones on the + side?
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Old 28th June 2011, 09:54 AM   #330
Luke is offline Luke  New Zealand
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Quote:
Originally Posted by apexaudio View Post
Regulated PSU for Amps with 4 pairs of outputs, output voltage can be set from +/-55V to +/-90V.
Hi Apex, did you ever make a pcb for the regulator in post 14 with 4 output transistors?
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