This is 8 LED audio level meter circuit diagram. Build based on 2 pieces of op-amp IC LM324. You should use 4 ICs for stereo audio level meter.
Here the schematic:
8 LED Audio Level Meter
Make Your Own Printed Circuit Boards
Make a PCB in very easy steps..! Create your PCB design using PCB designer software like Eagle, print out your design on photo paper or glossy paper with laserjet printer. Stick the printed design on the PCB (copper side) and then heat it using hot iron plate. The ink will stick on the PCB and it will be ready for etching process.
Watch this video detailed steps:
Note: If you don't have laserjet printer, then you can print the design on standard paper. Copy the printed design at Copy Service around your location (with glossy paper).
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