I turn my diy amplifier on and off with a 5V relay. The SMPS has power for about a second more after the relay have cut. So I was thinking that I could have another relay mute my 2 boards at the same time it turns off the SMPS. This would make the turn off pop go away.
Can I short the mute from BOTH boards in 1 relay or will I have to use 2. 1 for each board.
Im a bit reluctant from "just trying"
Edit. I have 2 x dual chip TPA3116 boards.
Can I short the mute from BOTH boards in 1 relay or will I have to use 2. 1 for each board.
Im a bit reluctant from "just trying"
Edit. I have 2 x dual chip TPA3116 boards.
I have built a few class d amps.
I use a 8 pin PIC micro to control the amp.
On power up it holds off speaker relay for 4 seconds.
On power down it turns off relay and holds class d chip in reset/mute until power comes back on.
Basic control is simple, hardest bit is programming A2D to read VCC volts.
I use a 8 pin PIC micro to control the amp.
On power up it holds off speaker relay for 4 seconds.
On power down it turns off relay and holds class d chip in reset/mute until power comes back on.
Basic control is simple, hardest bit is programming A2D to read VCC volts.
Smart. Will look into that. Any idea if I can mute both boards with 1 relay? This would connect mute and gnd on both boards
Good idea. Will do that instead. The SMPS has excess power about a second or two after AC loss.
But my main question
Can I mix the mute together in 1 relay from say 2 or 4 boards?
But my main question
Can I mix the mute together in 1 relay from say 2 or 4 boards?
Since you are using a single power supply then all amps share the same ground, you can connect all mute pins together.
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Im not so worried combining the GND's from several boards for muting. Was more worried about combining the mute wires in a relay.
Now that I think about it. 2 chips on 1 board share 1 mute function. Will try combining more boards
Now that I think about it. 2 chips on 1 board share 1 mute function. Will try combining more boards
My circuit was biased around B- so I had to use opto couplers to turn on/off the mute.
I used a opto coupler on each mute line of the stereo amp.
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