How to build VU Meter 3

Description

A very simple circuit of indication of level, with 10 Led. Is used the circuit of half-wave rectification of precision round the IC2, with gain one. With switch S1, we can select the indication of Led. The level of entry is 60 mV-1.25 V.

Circuit diagram

Part list

• R1-2=10Kohm
• R3-4=1Kohm
• D1-10=LED
• D11-12=1N 4148
• C1=10uF 25V
• C2=1uF 25V
• S1= mini switch
• IC1=LM3915
• IC2=TL071

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