The device is designed for on / off load from audio signals, for example clapping.
The scheme is as follows:
(click to enlarge)
Cotton adopted by the microphone and amplified by the transistor VT1 is supplied to a monostable multivibrator, which is made on the integral the timer DD1. Output connected D-flip-flop on the chip DD2, which changes its state to the opposite for each incoming with the multivibrator pulse. In short, it works like this - slammed once the relay has closed, slammed a second time, the relay parted.
Such is the dialectics.
Details:
The symbol on the schematic
The value
Note
R1
330
R2
3.6 kω
R3
Am
R4
2.7 ohms
AC
R5
Am
R6
Am
R7
1m
R8
100
R9
10K
R10
1K
C1
Thu
C2, C3, C4
NF
C5
NF
C6
0.1 μf
C7
Thu
VD1
CD
HL1
ALB
VT1
CTB
VT2
CTB
DD1
CREW
Bourgeois analogue 555
DD2
KTM
Bourgeois analogue CD4013
MIC1
PK-1
Any electret
K1
BS-12C
Any voltage of 12 V and necessary switching current.
Publication: www.radiokot.ru, www.cxem.net