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Old 8th May 2011, 02:15 PM   #1
gychang is offline gychang  United States
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Default trouble after adding pot/RCA selector, help

I have modified Helder's t-amp, and installed the volume, and 2 way RCA selector. Initiailly seems to work OK, but now I noticed, the volume is rather high on the L speaker even when the pot is all the down. Only when I turn it on beyond the half way, the other speaker (R) seems to come alive.

Switching the speaker wire confirms it is likely amp. Can someone tell me how to trouble shoot this?

thanks,



gychang
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Old 11th May 2011, 11:56 AM   #2
robywan is offline robywan  Australia
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Check your wiring on the pot, possibly the input wire coming from the input selector for the left channel is going to a pin other than number 3 connector pin on that Alps pot

Potentiometers (Beginners' Guide to Pots)

Pin one should go to ground, pin 2 to input of amp, and 3 is input from selector.

Can you explain the wiring /colour and or pics of the RCA ins and Pot close up, that way we can see what each wire does

To rule out your amp as the culprit disconnect your new wiring between the amp and the pot/selector and see if it does the same with direct input from a preamp or mp3 player with volume control.


Cheers

Toby
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Old 11th May 2011, 03:21 PM   #3
gychang is offline gychang  United States
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Quote:
Originally Posted by robywan View Post
Check your wiring on the pot, possibly the input wire coming from the input selector for the left channel is going to a pin other than number 3 connector pin on that Alps pot

Potentiometers (Beginners' Guide to Pots)

Pin one should go to ground, pin 2 to input of amp, and 3 is input from selector.

Can you explain the wiring /colour and or pics of the RCA ins and Pot close up, that way we can see what each wire does

To rule out your amp as the culprit disconnect your new wiring between the amp and the pot/selector and see if it does the same with direct input from a preamp or mp3 player with volume control.


Cheers

Toby
thanks for your input, I will check carefully the wiring as you suggested. I will also shorten the input wires to the amp.

gychang
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Old 12th May 2011, 08:56 AM   #4
robywan is offline robywan  Australia
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Glad to help let me know how you go :P
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Old 12th May 2011, 12:37 PM   #5
gychang is offline gychang  United States
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thanks, resoldering and proper wiring, now the total background silence, sound beautiful, thanks,

gychang
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Old 12th May 2011, 01:14 PM   #6
robywan is offline robywan  Australia
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Thats awesome so pot wired was wired wrong?
Great
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Old 12th May 2011, 08:51 PM   #7
gychang is offline gychang  United States
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Quote:
Originally Posted by robywan View Post
Thats awesome so pot wired was wired wrong?
Great
likely it was touching the next wire with my poor soldering technique, now all fixed.

gychang
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