Following my forray into resurecting a classic amp (see here), I've got a few designs to share.
This design is a full tone control and input selector pre-amp with RIAA stage. Based on the TDA7440 chip, which is an I2C controlled device, its got an onboard microcontroller which translates front-panel controls into I2C commands. SMD components, but all very hand solderable. Film capacitors used in the audio path.
6 channel input with BCD switch, otherwise 4 channel.
Bass, Treble, Balance adjustments
RIAA preamp
+/-12V supply input
All sounds amazing!
I've also put an interface into the board to allow IR remote control input. Haven't done the programming for this yet, but its very do-able (I did something similar with an Apple Remote a few years back).
Schematic attached!
I've both both PCBs and a few component sets going spare from my build. For the microcontroller, I've also got the kit to supply them pre-programmed as needed. If anyones interested, let me know.
This design is a full tone control and input selector pre-amp with RIAA stage. Based on the TDA7440 chip, which is an I2C controlled device, its got an onboard microcontroller which translates front-panel controls into I2C commands. SMD components, but all very hand solderable. Film capacitors used in the audio path.
6 channel input with BCD switch, otherwise 4 channel.
Bass, Treble, Balance adjustments
RIAA preamp
+/-12V supply input
All sounds amazing!
I've also put an interface into the board to allow IR remote control input. Haven't done the programming for this yet, but its very do-able (I did something similar with an Apple Remote a few years back).
Schematic attached!
I've both both PCBs and a few component sets going spare from my build. For the microcontroller, I've also got the kit to supply them pre-programmed as needed. If anyones interested, let me know.