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Old 18th December 2010, 07:06 PM   #1041
NMOS is offline NMOS  Germany
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Quote:
Originally Posted by apexaudio View Post
Your circuit for 35deg fan on/off is wrong. Use PNP transistors to switch fan (+) to GND. PA protect is for B500 and H900, I just suggest not use stereo PA protect for this powerfull amps.

have changed with PNP,..

coul this work ?
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Old 18th December 2010, 07:46 PM   #1042
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have changed with PNP,..

coul this work ?
Use 1k resistor from base to emiter of T5, and revert polarity of D3.
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Old 18th December 2010, 10:19 PM   #1043
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Originally Posted by apexaudio View Post
Use 1k resistor from base to emiter of T5, and revert polarity of D3.

ok have changed, please check,... is it ok ?

another question,...

Im a little confused.... 22uf in your PA Protect DC protection goes to GND ?

In my schematic C38 goes to GND with 220K and 2n5551, is this right or wrong
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Old 18th December 2010, 10:37 PM   #1044
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ok have changed, please check,... is it ok ?

another question,...

Im a little confused.... 22uf in your PA Protect DC protection goes to GND ?

In my schematic C38 goes to GND with 220K and 2n5551, is this right or wrong
22uF goes to GND, do you understand this circuit?
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Old 19th December 2010, 12:07 AM   #1045
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Originally Posted by apexaudio View Post
22uF goes to GND, do you understand this circuit?
Im try to learning,...please assist me

ok if not GND where..?
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Old 19th December 2010, 01:53 AM   #1046
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Im try to learning,...please assist me

ok if not GND where..?
22uF goes to GND, sorry for my bad English. 22uF and 150k are DC filter, and if there was DC voltage 2N5551 or 2N5401 conduct and voltage on B,C point of BD241C drop under 400mV, comparator B output goes to +15V...
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Old 19th December 2010, 03:12 PM   #1047
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hi apexaudio
greetings can you tell me the function of the 2 diodes
IN4148 CONNECTED TO BASE OF BC550 BC560 IN VERTEX SCHEMATIC
i am getting 56 volts positive dc on output have not connected output
transistors made driver stage till second pair where two 1K OHMM RESISTORS
ARE CONNECTED THE VI LIMITER TRANSISTOR BASE any reason why there is dc output will be very helpful
thanking you
andrew lebon my supply is 70 0 70 dc
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Old 19th December 2010, 03:23 PM   #1048
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Quote:
Originally Posted by andrewlebon View Post
hi apexaudio
greetings can you tell me the function of the 2 diodes
IN4148 CONNECTED TO BASE OF BC550 BC560 IN VERTEX SCHEMATIC
i am getting 56 volts positive dc on output have not connected output
transistors made driver stage till second pair where two 1K OHMM RESISTORS
ARE CONNECTED THE VI LIMITER TRANSISTOR BASE any reason why there is dc output will be very helpful
thanking you
andrew lebon my supply is 70 0 70 dc
Remove R2 (30k) to disconnect DC servo and measure DC voltage on 33V zeners, on resistors R69, R70, R71, R72 (680R), R88,R89 (68R) you must have 1,12V... Go to post #997 and look at the schematic without step driver for test on low power.

Last edited by apexaudio; 19th December 2010 at 03:37 PM.
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Old 19th December 2010, 11:07 PM   #1049
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HI APEXAUDIO
GREETINGS THANK YOU FOR REPLYING WILL CHECK IT TODAY
DO YOU HAVE SCHEMATIC OF DELONG MT 1500 AMP
THANKING YOU
ANDREW LEBON
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Old 20th December 2010, 09:37 AM   #1050
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Originally Posted by apexaudio View Post
Use this circuit for stereo, only add DC protect for channel 2. If you have two heatsinks add BD241C(TIP31C) in parallel.
Regards
ok sir thank you, i will try it, you're awsome man
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