Sound level indicator (CB20737E)

Any small sound amplifier from 200mW to 1W can be used in this simple circuit. Or circuit of two 80s based on a trigger like 555.

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Variable Source (CB18169E)
This source, from a 1982 documentation, uses a triac to control the power and voltage applied to...
6 W Amplifier TDA2613 (CB15725E)
The amplifier presented is ideal for use in small monophonic sound systems, radios or televisions powered...
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