Question

When audio is played through this circuit, LED's light up depending on the frequency. Can you please, for the top configuration constructed, explain to me in detail, how:

R27 MLEDe1MLED81 MLEDS1 12 UV4 03 R5 C5 100 LF347/301/ 121S79 100 12 EDS V19R28 D30 R16 R19 100 R20 4 LF347 301/T R29 MLEDe1 MLEDS1 MLEDS1 D33 V18 V19+ C10 LF347/301 R26 31 10K

1) the audio signal travels through the circuit,

2) the math behind how certain frequencies are filtered out,

3) the roles of C5 and R21,

4) and the role of the transistor in this circuit.

I'd love to see the math and the detail behind it all, especially when it comes to choosing certain component values. I greatly appreciate any and all help! Thanks!

Answer 1

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