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Old 26th February 2011, 12:58 AM   #1341
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Hi Miles....
for one pair of output and dc voltage + / - 40v, what are the changes?
thank you sir
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Old 26th February 2011, 12:40 PM   #1342
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to check the amp in full volume without speakers using 500w bulps in amp out is it correct?
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Old 26th February 2011, 12:53 PM   #1343
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Quote:
Originally Posted by nazirdigi View Post
to check the amp in full volume without speakers using 500w bulps in amp out is it correct?
No, use resistors for shunt on output for test. Bulps is NTC resistor ( 0,1R cold and 2,8R when light at 12V for 50W bulp), useless and danger to connect on amp out exsept in series with speaker for protect.
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Old 26th February 2011, 12:55 PM   #1344
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Quote:
Originally Posted by Noerhakim View Post
Hi Miles....
for one pair of output and dc voltage + / - 40v, what are the changes?
thank you sir
Use 1k/2W instead 2k2/2W for R24 and R25.
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Old 26th February 2011, 12:58 PM   #1345
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in the pcb there is r24 and r25 4.7k/2w resistor why is that.
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Old 26th February 2011, 01:00 PM   #1346
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Originally Posted by apexaudio View Post
Use 1k/2W instead 2k2/2W for R24 and R25.
how many watts of output?
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Old 26th February 2011, 02:42 PM   #1347
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Quote:
Originally Posted by nazirdigi View Post
in the pcb there is r24 and r25 4.7k/2w resistor why is that.
4k7/2W is only for test with +/-90V rail.
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Old 26th February 2011, 02:42 PM   #1348
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Quote:
Originally Posted by Noerhakim View Post
how many watts of output?
120W/4R with +/-40V DC
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Old 26th February 2011, 02:48 PM   #1349
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Originally Posted by apexaudio View Post
120W/4R with +/-40V DC
I plan to use this circuit for powered speakers, 3 pairs of outputs for low and one pair of outputs for high (8 ohm speakers)
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Old 26th February 2011, 04:00 PM   #1350
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Noerhakim View Post
I plan to use this circuit for powered speakers, 3 pairs of outputs for low and one pair of outputs for high (8 ohm speakers)
120W/4r tells you a channel can drive a 4r0 load to 120W.

If you attach a group of speakers to that one channel then the effective impedance of the group of speakers must not be less than 4ohm.
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