PrefaceThe LCDuino-1 can be used in many applications and configurations, it's not possible to document every case. This section covers the most common usage, namely, as a controller for the δ1 stereo attenuator and δ2 stereo input/output selector boards in an audio amplifier; and as the controller for the γ3 DAC.
The internal layout of your enclosure is an important factor to good performance. The placement and orientation of the boards and routing of wires must be carefully considered.
J7 and J8 on the LCDuino-1 board are currently unused. They are for future expansion.
System wiring for LCDuino-1 with δ1 and δ2The following is a wiring diagram for an unbalanced system using one δ1 stereo attenuator board and one δ2 stereo input/output selector board. A balanced system will require two δ1 and two δ2 boards. Virtually all connections are done via Molex KK 254 connectors for easy disassembly. You will need to build the wiring harnesses first.
System wiring for LCDuino-1 with γ3The following is the wiring diagram for the LCDuino-1 in a γ3 DAC. For easy disassembly, virtually all wire connections are done with Molex KK 254 connectors on both ends.
Motorized potentiometer wiringThe potentiometer wiring detail for the Alps RK16812MG099 is shown below. Click on the image to see a larger version. The potentiometer's body should be grounded to the metal chassis via its panel-mounting nut. If your panel is non-conductive, then you should add a ground wire.
Power supply wiring for LCDuino-1 with δ1 and δ2It is assumed that you have a "constantly-on", regulated 5V DC power supply for the LCDuino-1, δ1 and δ2 boards. A good candidate would be the σ25 power supply. See the overview page about power supply requirements.
Note that there are two power transformers. The T2 power transformer (powered as long as the AC cord is plugged in) feeds a σ25 power supply with 5V DC output, providing power to the LCDuino-1, δ1 and δ2 boards. The solid-state relay, controlled by LCDuino-1, switches the AC mains power to the T1 transformer, which supplies power to the amplifier circuit.
Power supply wiring for LCDuino-1 with γ3It is assumed that you have a "constantly-on", regulated 5V DC power supply for the LCDuino-1 board. This power supply will also provide power to some circuitry on the γ3. A good candidate would be the σ11 power supply. See the overview page about power supply requirements.
Note that there are three power transformers. The T3 power transformer (powered as long as the AC cord is plugged in) feeds a σ11 power supply with 5V DC output, providing power to the LCDuino-1 and a portion of the γ3. The solid-state relay, controlled by LCDuino-1, switches the AC mains power to the T1 and T2 transformers, which provide power to the γ3 DAC analog and digital circuitry.
AMB's reference γ3 used an R-core transformer with multiple secondary windings for a combined T1 and T2, and a separate toroidal transformer for T3. As with the reference γ3, it is recommended that you use a separate chassis for the power supply, to eliminate any potential hum due to transformer magnetic field interference.
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