I created a chiptunes player circuit on a breadboard containing the following:
- General Instrument AY-3-8910 Programmable Sound Generator
- Arduino 5V Pro Mini
- SparkFun Mono Amplifier
- SparkFun Level Shifter
- Generic Micro SD breakout board (does not include level shifters)
- Texas Instruments TLV-2217 3.3V LDO Regulator (used by the SD breakout and level shifter)
The board has several headers to supply power, connect an FTDI adapter, and to configure the audio mixing to the amplifier.
The signal connections are as follows:
Signal AY-3-8910 Arduino Other/Notes
------ --------- ------- -----------
Vcc (+5V) 40 VCC TLV-2217 Vin, Amplifier PWR+, headers, Level Shifter HV
GND 1 GND TLV-2217 GND, Level Shifter, Amplifier, SD Breakout, headers
Audio Ch A 4 Headers
Audio Ch B 3 Headers
Audio Ch C 38 Headers
BDIR 27 A2
BC2 28 A1
BC1 29 A0
RESET 23 N.C. (pulled up internal to AY-3-8910)
CLOCK 22 D9
A9 24 N.C. (pulled down internal to AY-3-8910)
A8 25 N.C. (pulled up internal to AY-3-8910)
DA7 30 A3
DA6 31 D8
DA5 32 D7
DA4 33 D6
DA3 34 D5
DA2 35 D4
DA1 36 D2
DA0 37 D3
SPI MOSI D11 Level Shifter, then SD Breakout MOSI
SPI MISO D12 Level Shifter, then SD Breakout MISO
SD CS D10 Level Shifter, then SD Breakout CS
SPI CLK D13 Level Shifter, then SD Breakout CLK
3.3V TLV-2217 Vout, Level Shifter LV, SD Breakout 3.3V
RXI D0 FTDI Header TX
TXO D1 FTDI Header RX
BUTTON A4/D18/SDA Pushbutton switch to GND
The 3.3V regulator is mounted below the Arduino (to save space) and is not visible in the photos.
