Circuit Project Electronic

Notes:
This sensitive sound operated switch can be used with a dynamic microphone insert as above,
or be used with an electret (ECM) microphone. If an ECM is used then R1 (shown dotted) will
need to be included. A suitable value would be between 2.2k and 10kohms.
The two BC109C transitors form an audio preamp, the gain of which [...]

Notes:
This sensitive sound operated switch can be used with a dynamic microphone insert as above,
or be used with an electret (ECM) microphone. If an ECM is used then R1 (shown dotted) will
need to be included. A suitable value would be between 2.2k and 10kohms.
The two BC109C transitors form an audio preamp, the gain of which [...]

This is Electronic Switch, Control by Sound. It is mini Circuit and easy,
use IC 1458 or 4558 or LF353 ,
SCR for Switch Electronic = Relay Switch. Volt supply 9V.
Circuit Sound SCR Switch by IC 1458 & SCR C106D

PCB Sound SCR Switch by IC 1458 & SCR C106D
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