The circuit is placed parallel with the exit of power amplifier and us gives the level of signal ,from output. Changing resistance R1, in the input circuit, we adapt the indication of power, in the resistance of loudspeaker, that we use.
Part List
R1 = 10 KΩ for 4 Ω
R1 = 18 Ω for 8 Ω
R2 = 10 KΩ
R3 = 390 Ω
R4 = 2.7 Ω
C1 = 2.2 μF/25V
D1…D10 = Led
S1 = Mini SwitchIC1 = LM3915
R1 = 18 Ω for 8 Ω
R2 = 10 KΩ
R3 = 390 Ω
R4 = 2.7 Ω
C1 = 2.2 μF/25V
D1…D10 = Led
S1 = Mini SwitchIC1 = LM3915
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