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