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prorms 11th September 2007 02:30 AM

power supply problem pop noise
2 Attachment(s)
iam using a lm317 lm337 circuit
keep getting pop noise every 15 sec
7volts and -7 volts

prorms 11th September 2007 02:34 AM

2 Attachment(s)

prorms 11th September 2007 02:36 AM

basic diode setup 4 diode

transfomer 14vct 0.250 mA

prorms 11th September 2007 01:10 PM

opamp iam using are opa134 lf351 iam have connect with no resistors just stright in

Dzsoni 11th September 2007 01:20 PM

Every 15 sec? Strange... LLOks like a capacitor-problem...

Value of PS caps in uF?
About 1000uF would be OK.

[On the margin I would use much higher rails for the OPAs, say +/-15V.]

prorms 11th September 2007 11:15 PM

2 Attachment(s)
was not the power supply section but it was the last part
of the preamp that goes to the power amp
preamp on its own powersupply and circuit form the power amp
in stead of using diff voltage i use like a battery

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