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Room Sound Monitor

Room Sound Monitor

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VR1

10K

PRESET

R2

330K

T1

BC548

C1

0.1μ

R1

10K

C2

0.1μ

R3

270K

C3

220μ

16V

R4

180Ω

T3

BEL188/

SK100

R5

220Ω

R6

680Ω

R7

220Ω

R8

680Ω

T4

BEL188/

SK100

C4

0.1μ

T2

BC548

C6

220μ

16V

LS1

8 Ω

0.5W

SPEAKER

+3V

C5

220μ

16V

COND.

MIC

X1 = 6 VOLT AUDIO TRANSFORMER

X1

Room Sound Monitor

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publish time: 2020-09-22
Kiraaaa

Through this simple circuit, you can secretly listen to the ongoing conversation in the room. The circuit is powered by a 3V battery, which is extremely sensitive.

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