Volume control

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Last seen: 2 years 11 months ago
Joined: Dec 20 2003 - 10:38
Volume control

This continues a thread from the old forums. I am trying to figure out how to control the sound volume through the a/b connector for sound from a line level source. I looked at the datasheet for the amplifier chip (TDA7052A) and read the pins directly. I checked the various pins on the amplifier chip itself while raising and lowering the volume, and I'm a little baffled. Nothing changed at all! The power-in is 5v, the positive signal pin stays steady at 2.5v, and the volume control pin stays steady at 4.9v. The data sheet implies, as far as I can tell (being the amateur I am) that the volume is controlled by varying the voltage on the volume control pin, but this is not happening. Any ideas?

Last seen: 5 years 1 month ago
Joined: Dec 20 2003 - 10:38
Are you sure it's not done by

Are you sure it's not done by pulses, that your meter isn't registering? Just a guess - no evidence for my theory!


Jon's picture
Last seen: 7 years 1 month ago
Joined: Dec 20 2003 - 10:38
That would be a case to try a

That would be a case to try an analog meter ovre a digital. You'll see the needle wiggle more likely than to see the digital change the readout to register a short pulse.


No one should be protected from the effects of his own stupidity. - Anton Szandor LaVey in 1988 (There is a certain irony in this quote... :p)

Last seen: 13 years 6 months ago
Joined: Mar 1 2004 - 22:18
volume control

If the input is controlled in an earlier stage,Mobo?, than the end amp setting don't alter.
If you change the volume control voltage of the chip, the volume should change, I guess.

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