trouble after adding pot/RCA selector, help

gychang · 8th May 2011, 02:15 PM

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

robywan · 11th May 2011, 11:56 AM

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

gychang · 11th May 2011, 03:21 PM

Quote:

Originally Posted by robywan

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

robywan · 12th May 2011, 08:56 AM

Glad to help

let me know how you go :P

gychang · 12th May 2011, 12:37 PM

thanks, resoldering and proper wiring, now the total background silence, sound beautiful, thanks,

gychang

robywan · 12th May 2011, 01:14 PM

Thats awesome

so pot wired was wired wrong?
Great

gychang · 12th May 2011, 08:51 PM

Quote:

Originally Posted by robywan

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

12th May 2011, 12:37 PM	#5
gychang diyAudio Member Join Date: Feb 2005 Location: Phoenix, Arizona	thanks, resoldering and proper wiring, now the total background silence, sound beautiful, thanks, gychang __________________ -- Good sound from Phoenix, AZ

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11th May 2011, 11:56 AM	#2
robywan diyAudio Member Join Date: Oct 2008	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

12th May 2011, 08:56 AM	#4
robywan diyAudio Member Join Date: Oct 2008	Glad to help let me know how you go :P

12th May 2011, 01:14 PM	#6
robywan diyAudio Member Join Date: Oct 2008	Thats awesome so pot wired was wired wrong? Great

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