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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

My RF controled PGA2320 MiniVol and ch selector
My RF controled PGA2320 MiniVol and ch selector
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Old 21st January 2010, 09:36 AM   #1
quadtech is offline quadtech  India
diyAudio Member
Join Date: Oct 2007
Default My RF controled PGA2320 MiniVol and ch selector

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 -


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.
Attached Images
File Type: jpg pre-6.jpg (176.8 KB, 1331 views)
File Type: jpg pre-7.jpg (148.6 KB, 742 views)
File Type: jpg pre-3.jpg (69.5 KB, 731 views)
File Type: jpg pre-2.jpg (244.1 KB, 729 views)
Attached Files
File Type: zip 4017-ch-sel.zip (39.6 KB, 172 views)

Last edited by quadtech; 21st January 2010 at 09:39 AM.
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Old 8th February 2011, 06:11 PM   #2
linuxworks is offline linuxworks  United States
diyAudio Member
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Join Date: Jul 2008
Location: Santa Clara, CA
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.
My Photostream:http://www.flickr.com/photos/linux-works/
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