Help!! Poping

easyrider · 25th February 2004, 09:31 PM

Hi everyone,

Im a newbe around here, have been following the trend, and tried to build a Gainclone. anyways I have got to a point where I need Help!

my problem: I am getting stange pops from the speaker. and have measured the terminals and they seem to read 35v on them

and 15 amps

this is a non -inverted gainclone based on these scmatics:

only difference is i have left out R3 and C2

and am using 22k resitors instiad of 20k's

and all earth cables go to one point (C3) earth and then out to the Power suply.

I have tried putting in R4 and is now left off.

any help apriciated

easyrider

ronc · 25th February 2004, 09:38 PM

Poping? isint he the guy in the funny hat?
Make VERY sure that the caps to the power pins has the correct polarity.
ron

Nuuk · 27th February 2004, 08:48 AM

Quote:

and have measured the terminals and they seem to read 35v on them and 15 amps

Are you saying that you have 35 volts DC across the speaker terminals? If so then you will be needing soe new speakers.

The first things to do is check your power supply. If you are using a transformer with 18 volt secondaries, you should have rails of +/- 27-28 volts DC. If you use a transformer with 24-25 secondaries, the rails should be 36-37 volts DC.

If you have the correct supplies, make sure that the power is connected to the chip. I would guess if you have 35 volts on the speaker terminals, one rail is not connected.

Remember to measure the output on the speaker terminals with a 10 ohm resistor connected across them.

djk · 27th February 2004, 01:46 PM

"only difference is i have left out R3 and C2"

Without R3 and C2 the amplifier will oscillate and get very hot, this will activate SPIKE internal protection circuitry and make popping sounds.

"I have tried putting in R4 and is now left off"

Without R4 the amplifier will latch up to the power supply rail.

25th February 2004, 09:31 PM	#1
easyrider diyAudio Member Join Date: Oct 2003 Location: jaming to my music in a field	Help!! Poping Hi everyone, Im a newbe around here, have been following the trend, and tried to build a Gainclone. anyways I have got to a point where I need Help! my problem: I am getting stange pops from the speaker. and have measured the terminals and they seem to read 35v on them and 15 amps this is a non -inverted gainclone based on these scmatics: only difference is i have left out R3 and C2 and am using 22k resitors instiad of 20k's and all earth cables go to one point (C3) earth and then out to the Power suply. I have tried putting in R4 and is now left off. any help apriciated easyrider

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25th February 2004, 09:38 PM	#2
ronc diyAudio Member Join Date: Mar 2003	Poping? isint he the guy in the funny hat? Make VERY sure that the caps to the power pins has the correct polarity. ron

27th February 2004, 01:46 PM	#4
djk diyAudio Member Join Date: Feb 2001 Location: USA	"only difference is i have left out R3 and C2" Without R3 and C2 the amplifier will oscillate and get very hot, this will activate SPIKE internal protection circuitry and make popping sounds. "I have tried putting in R4 and is now left off" Without R4 the amplifier will latch up to the power supply rail.

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