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Old 1st October 2003, 01:09 PM   #1
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Default loud hummmmmmmmmm

hi

its my first time to build a gainclone, i have wired everything up and plugged the amp into a 220 volts socket. all i hear is a loud humm and a faint sound of the music. im a little confused with regards to the diagram.

where do you put the pot?is it between the 4.7 ufd 35 volts cap. and the phono input?cause thats what i did.

are my speaker busted already?

instead of the 56k filter, you can put the pot right? the pot that i have has 3 solder leads, how do you wire them up?

i seem to be lacking some parts in my gainclone.

i have wired up the ff.

4.7 uf 35v cap=1
1000 uf 50v cap=2
220k resistor, 1/4 wat=1
10k resistor 1/4 watt=

thanks for your help.
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Old 1st October 2003, 02:12 PM   #2
miguel2 is offline miguel2  Portugal
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Join Date: Jun 2002
Location: Portugal
Hi,

DONT connect your speakers now! Use first some crap speaker you dont mind to loose.

Measure offset of both channels. Starwire the ground wires. Try it without the pot: input cap (4.7), 10k resistor to -input. +input to ground. 220k on feedback. 1000uF caps on the rails. And youre done!

Miguel
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Old 1st October 2003, 03:37 PM   #3
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Location: Bristol
Default Re: loud hummmmmmmmmm

Quote:
Originally posted by moonshow
hi

its my first time to build a gainclone, i have wired everything up and plugged the amp into a 220 volts socket. all i hear is a loud humm and a faint sound of the music. im a little confused with regards to the diagram.

where do you put the pot?is it between the 4.7 ufd 35 volts cap. and the phono input?cause thats what i did.

are my speaker busted already?

instead of the 56k filter, you can put the pot right? the pot that i have has 3 solder leads, how do you wire them up?

i seem to be lacking some parts in my gainclone.

i have wired up the ff.

4.7 uf 35v cap=1
1000 uf 50v cap=2
220k resistor, 1/4 wat=1
10k resistor 1/4 watt=

thanks for your help.

Quote:
Originally posted by miguel2
Hi,

DONT connect your speakers now! Use first some crap speaker you dont mind to loose.

Measure offset of both channels. Starwire the ground wires. Try it without the pot: input cap (4.7), 10k resistor to -input. +input to ground. 220k on feedback. 1000uF caps on the rails. And youre done!

Miguel
yes, use a rubbish test speaker.

sorry about the bad quality diagram, i hope you get the idea though...
Attached Images
File Type: gif pot.gif (2.2 KB, 197 views)
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