Supply voltage can be from 3V to 20V. The input is set for audio line voltage (1V peak to peak) and has a max input voltage of 1.3V. To make the circuit use a moving dot display instead of bar graph display, Pin 9 can be should be disconnected from +V.
Parts List.
| C1 C2, C3 R1, R3 R2 R4 R5 D1 Q1 LED1-LED10 U1 MISC | 2.2uF 25V Electrolytic Capacitor 0.1uF Ceramic Disc Capacitor 1K 1/4W Resistor 10K 1/4W Resistor 100K 1/4W Resistor 1M 1/4W Resistor 1N4001 Silicon Diode BC 558 PNP Transistor Standard LED or LED Array LM3915 Audio Level IC Board, Wire, Socket For U1 |