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Multipurpose Listening Device

Multipurpose Listening Device

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VR1

10K

R1

4.7K

R3

100K

R4

3.9K

R6

1.5K

C4

10V

T2

BC548

C3

100μ

16V

T1

BC548

R2

1M

C1

0.22μ

COND.

MIC

BATT.
3V

S1

ON/OFF

SWITCH

T3

BC548

R5

20K

1N4148

T4

BC337

SOCKET

FOR

HEADPHONE

R7

10K

C5

0.47μ

C2

0.22μ

Multipurpose Listening Device

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0
publish time: 2020-09-22
Kiraaaa

This circuit can detect very weak, remote sounds. For example, conference halls, auditoriums, cinema halls, university lecture rooms, etc. The circuit can be contained in a small plastic box and placed in a shirt pocket. This is useful for watching TV, where the volume of the program is low so as not to disturb other family members in the house.

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