ASCII version:
_______ / \ / 6 7 \ | 3 1 | | 4 5 | \ 2 / \_______/
Pin| Signal ---+------------------ 1 | GND 2 | GND 3 | GND 4 | N.C. 5 | +5V (max. 1.5A) 6 | 9 VAC (max. 1.0A) 7 | 9 VAC (max. 1.0A)Note that the voltage on pins 6 and 7 do NOT refer to ground. If you measure the voltage on either pin 6 or 7 against ground with an oscilloscope, you will get positive half-sine waves.
Note: All pictures show the jack side.