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Stroboscope filter

Based on a Labs project | October 2011 | Find it here
Stroboscope filter
To drive a stroboscope from an audio signal, the signal must first be reduced to its low-frequency component. This can be done with the circuit presented here. Coupling capacitors C4 and C5, for the left and right channels, prevent any DC voltages in the audio signals from reaching the transistor buffer stage (T1).
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