I got a lovely MiniVol board with the PGA2320 chip driven by a AVR microcontroller from diyaudio member, theAnonymous1. The minivol provides vol up/down and mute, controlled by push switches or a rotary encoder.
The MiniVol is described here -
http://audio.gotroot.ca/minivol/
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!
I am also attaching the Eagle files for the channel select circuit.
The MiniVol is described here -
http://audio.gotroot.ca/minivol/
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!
I am also attaching the Eagle files for the channel select circuit.
Attachments
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a chocolate attenuator 😉 😉
I've used those ebay rf remotes before (I designed a camera shutter/focus remote based on those rf modules). they are pretty cool and easy to interface with.
for the relays - if you can get away with you - you can use ssr chips and have those trigger some other thing. the RF receiver modules are 5v based, I think, and so you add a small series R and go into an SSR chip, then use the 'contacts' pins to control the relays. it might make it a little quieter in operation and simplify things. you can also get the rf receivers without the relays onboard and have a smaller package.
I've used those ebay rf remotes before (I designed a camera shutter/focus remote based on those rf modules). they are pretty cool and easy to interface with.
for the relays - if you can get away with you - you can use ssr chips and have those trigger some other thing. the RF receiver modules are 5v based, I think, and so you add a small series R and go into an SSR chip, then use the 'contacts' pins to control the relays. it might make it a little quieter in operation and simplify things. you can also get the rf receivers without the relays onboard and have a smaller package.
Thanks, I do unfortunately not own Eagle but your project looks great and you have understand something most, including me have not yet figured out.
It's a "crime" to hide a well made project inside an opaque box!🙂
EDIT: What about the sound, do the case make it particular sweet? 🙂
ebay do have a lot of great items, but they are often pre build🙂
It's a "crime" to hide a well made project inside an opaque box!🙂
EDIT: What about the sound, do the case make it particular sweet? 🙂
ebay do have a lot of great items, but they are often pre build🙂
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Thanks, FriedMule - I agree, it is fun to have electronics which you can see.
The sweet box version was a quick prototype - later, the selector boards were
made by Sachin as a group buy in India. Just saw the date - it's 10 years since that was made!
The sweet box version was a quick prototype - later, the selector boards were
made by Sachin as a group buy in India. Just saw the date - it's 10 years since that was made!