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Old 25th July 2013, 02:07 AM   #2511
jaagut is offline jaagut  Philippines
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Quote:
Originally Posted by ridelperez34 View Post
I already tried rotating 180 the mses. I also checked that the transistors match pcb layout.

I'll check it again. Thanks
if there is fault on the circuit, some transistors can be destroyed during testing without the evidence of physical burns. remove them from board and test it again with multimeter.
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Old 25th July 2013, 11:08 PM   #2512
borys is offline borys  Poland
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I made some small changes to ax11 amp - as sansui au217 amplifier (preaty same amp) and have smmall question - can the input buffer be bypassed and input pair be substituted with 2sk170 tranies ?
I have made some simulations and amp is preatty quick and looks stable.

The square is 20kHz
THX
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Old 26th July 2013, 12:27 AM   #2513
joeyt is offline joeyt  Philippines
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ready for testing
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Old 26th July 2013, 03:29 AM   #2514
jaagut is offline jaagut  Philippines
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ready for testing
nice build and heatsink!
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Old 26th July 2013, 04:49 AM   #2515
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ang galing!
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Old 26th July 2013, 08:45 AM   #2516
joeyt is offline joeyt  Philippines
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can i have the voltages measurement of ax-11? my ax 11 have a 5v in amp out without the output transistor.
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Old 26th July 2013, 09:39 AM   #2517
jaagut is offline jaagut  Philippines
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Quote:
Originally Posted by joeyt View Post
can i have the voltages measurement of ax-11? my ax 11 have a 5v in amp out without the output transistor.
usually this happens when signal ground is not connected to PSU ground.
normal reading of DC offset should be lower than +/-50 millivolts.

edit: output trans must be installed.
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Old 26th July 2013, 11:54 AM   #2518
joeyt is offline joeyt  Philippines
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i insert a wrong transistor replacement for bd139, hope this is only the problem

joeyt,
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Old 28th July 2013, 02:34 PM   #2519
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Hi already replaced all the bcs and 5401 transistor but still have 7volts dc offset. Pls help
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Old 28th July 2013, 06:03 PM   #2520
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Quote:
Originally Posted by ridelperez34 View Post
Hi already replaced all the bcs and 5401 transistor but still have 7volts dc offset. Pls help
Give us schematic with voltages on resistors
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