hi people i'm trying to make an analog multiplier..... i just need to multiply a square wave(0V when low and 5V when hi) with a sine wave ..... when the square is low there isnt any output and when its hi the sine should occur at output..... may be a single quad would do it.... i know this IC called AD633 bt its a bit expensive in my country so i wz thinking if this could happen using some op amps etc..... thanks....