Hello, I need help with an auto level controll circuit. I'm using the NE572 compander. I've designed according to the data sheet available from phillips semiconductors. The problem is with bandwidth. I'm building a chromatic tuner for fourth year electrical engineering design course. I'm using the auto level controll to hold my signal level from a mic for acoustic instruments long enough so the rest of my circuit can work with it. I'm using an electret mic. The problem I'm having is that the gain is constan fro, 100Hz to 1kHZ, anything above or below that and the gain is halved. I need to go from 27.5Hz to about 4.5kHz. The circuit I used is straight off the data sheet, and I'm using a supply of 6V. I also seem to be having some problems with the electret mic. I'm running it off a 6V supply from a 10k resistor. If anyone can help, i would be forever greatfull.