I'm building a solid state preamp using analogue switches as input selector plus some other "nice" functions. I was wondering if someone in this forum has a PIC based software programme that I could use for this?
My needs are as follows:
- Selecting one of eight inputs
- Outputs for 100% Mute and -20 dB Mute
- Output to Mute Power Amp, when listening to headphones
I have a PIC programmer laying, however I had never had the time to look closer to it, and the "old" day using mnemonics has passed 😉
I think I'll be able to do some minor modification to the software myself, but I prefer "as close as possible"
Thanks in advance.................
My needs are as follows:
- Selecting one of eight inputs
- Outputs for 100% Mute and -20 dB Mute
- Output to Mute Power Amp, when listening to headphones
I have a PIC programmer laying, however I had never had the time to look closer to it, and the "old" day using mnemonics has passed 😉
I think I'll be able to do some minor modification to the software myself, but I prefer "as close as possible"
Thanks in advance.................
ACD,
I've made something similar, please see my website. The number of inputs is less than what you wanted, but it can be changed. It has the following features:
* 4 inputs selected by an analog multiplexer (looking back, I wish I used relays)
* IR remote control (any Philips RC-5 compatible remote)
* LM1973 uPot attenuator (supports 78 steps between 0dB and -70dB, has a -100dB mute function also)
* Battery backed NVRAM to store parameters
* Alphanumeric LCD display driver
It works fairly well, but there's noise coming from the PIC sending data over the SPI bus to and from the NVRAM chip, which also has an RTC (displays the time on the LCD when idle... kinda lame, eh?
). My site has schematics and a ZIP file with source. Hope this helps...
I've made something similar, please see my website. The number of inputs is less than what you wanted, but it can be changed. It has the following features:
* 4 inputs selected by an analog multiplexer (looking back, I wish I used relays)
* IR remote control (any Philips RC-5 compatible remote)
* LM1973 uPot attenuator (supports 78 steps between 0dB and -70dB, has a -100dB mute function also)
* Battery backed NVRAM to store parameters
* Alphanumeric LCD display driver
It works fairly well, but there's noise coming from the PIC sending data over the SPI bus to and from the NVRAM chip, which also has an RTC (displays the time on the LCD when idle... kinda lame, eh?
). My site has schematics and a ZIP file with source. Hope this helps...
Hey Jan. Have a look at this thread http://www.diyaudio.com/forums/showthread.php?threadid=26298 Maybe Mikkel can be of some help to you?
/U.
/U.
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