(I also posted this on diyaudio)
I got a lovely MiniVol board with the PGA2320 chip driven by a AVR microcontroller from diyaudio member.
The minivol provides vol up/down and mute, controlled by push switches or a rotary encoder.
The MiniVol is described here -
MiniVol PGA2320 Volume Control - error404's Audio DIY Endeavours
I also wanted a channel selector. So I rigged up a small
circuit around a CD4017 to step through the channels.
The DPDT relays are driven via 2N2222s.
To control everything, I got a cheap 4 Channel RF controlled switch on ebay. The receiver has a couple of
jumpers to choose the mode - toggle, latch or momentary.
I used the momentary mode. The 4 channels are used
for Vol Up, Vol Down, Mute and Channel select.
The open RF receiver/relay board, and the remote alongside are visible in one of the pics.
The PGA2320 is a really nice volume control chip, sweet
and transparent.
I wanted an appropriate box, so I put
the whole thing in a Ferrero Rocher chocolate box!
Eagle files for the channel select logic are in my diyaudio post.
Prasad
I got a lovely MiniVol board with the PGA2320 chip driven by a AVR microcontroller from diyaudio member.
The minivol provides vol up/down and mute, controlled by push switches or a rotary encoder.
The MiniVol is described here -
MiniVol PGA2320 Volume Control - error404's Audio DIY Endeavours
I also wanted a channel selector. So I rigged up a small
circuit around a CD4017 to step through the channels.
The DPDT relays are driven via 2N2222s.
To control everything, I got a cheap 4 Channel RF controlled switch on ebay. The receiver has a couple of
jumpers to choose the mode - toggle, latch or momentary.
I used the momentary mode. The 4 channels are used
for Vol Up, Vol Down, Mute and Channel select.
The open RF receiver/relay board, and the remote alongside are visible in one of the pics.
The PGA2320 is a really nice volume control chip, sweet
and transparent.
I wanted an appropriate box, so I put
the whole thing in a Ferrero Rocher chocolate box!
Eagle files for the channel select logic are in my diyaudio post.
Prasad
Last edited: