Hi Audioguru, I am new to this site and I am in the middle of building this project but I can not seem to get it working properly. I know I have a serious problem as the the dc voltage of pin 5 of the 3915 is 5.2V and pin 6 is 1.25V. In dot mode the tenth set of led's is on and in bar mode, all ten led's are on. The signal is simply way to high. I have checked the circuit and everything looks the same. I used a 78L05AC 5V regulator. Could this be my problem. Thanks, Adam