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DIY: LCDuino Alpha10 Preamp
My finished laser-cut chassis. I'm happy with how it turned out.
This is the LCDuino audio preamp that I designed and built (working with Ti Kan of AMB labs for pcb design and fab).
This device is a remote-controlled audio preamplifier that includes input/output line selection, motorized volume control knob (control element, only), a relay-based R2R style precise analog attenuator, low-noise linear discrete (for analog) power supplies and line-buffer amps and using hitachi standard 2x16 LCD displays, all controlled by my open-source Arduino code.
On the left, you'll see a board with a row of relays. That is the attenuator or volume-control part. Below it is a mating board that uses much of the same control logic but it's relays switch inputs and outputs.
On the right are two power supplies; an analog discrete dual tracking 12v (sigma22) and a small linear 7805 style 5v.
In the middle are 2 small alpha20 discrete analog line buffer/drivers.
Front of chassis is the LCD display with the LCDuino mounted behind it 'backpack style'. The LCDuino runs Arduino application code that gives this hardware all the remote control and user interface functions. The firmware is open-source and end-users can easily modify it if needed.
More info on the A10 preamp project at:
DIY: LCDuino Alpha10 Preamp
My finished laser-cut chassis. I'm happy with how it turned out.
This is the LCDuino audio preamp that I designed and built (working with Ti Kan of AMB labs for pcb design and fab).
This device is a remote-controlled audio preamplifier that includes input/output line selection, motorized volume control knob (control element, only), a relay-based R2R style precise analog attenuator, low-noise linear discrete (for analog) power supplies and line-buffer amps and using hitachi standard 2x16 LCD displays, all controlled by my open-source Arduino code.
On the left, you'll see a board with a row of relays. That is the attenuator or volume-control part. Below it is a mating board that uses much of the same control logic but it's relays switch inputs and outputs.
On the right are two power supplies; an analog discrete dual tracking 12v (sigma22) and a small linear 7805 style 5v.
In the middle are 2 small alpha20 discrete analog line buffer/drivers.
Front of chassis is the LCD display with the LCDuino mounted behind it 'backpack style'. The LCDuino runs Arduino application code that gives this hardware all the remote control and user interface functions. The firmware is open-source and end-users can easily modify it if needed.
More info on the A10 preamp project at: