39 External speed controller and power supply photographs Rear view Speed controller: • 3.5mm mono socket is the same power connection as on the original PT turntable; 9VDC with a positive tip. • DIN 7 pin socket connects to the turntable and carries the four motor control wires and a separate 9VDC and return for powering LEDs under the platter etc. Power supply: • IEC socket uses a 500mA quick blow fuse. • Switch controls the supply of mains to the transformer. • 3.5mm mono socket supplies 9V DC. Front view view Speed controller: • Rotary knob has three positions – from left to right: 45, off, 33⅓. • The switch illuminates the pink triangle badge and the LEDs under the platter. • Blue LED indicator ring is illuminated when controller is powered up. Power supply: • Red LED indicator ring is illuminated when transformer is powered up; i.e. rear switch is on. • Switch controls the supply of 9V DC to 3.5mm output socket.