If, through the inverter S1, connects the base of transistor TR1 on pin 1 of IC2 / A, the relay is activated and after a few seconds, turns off.
To increase the bonding time of the relay, just replace the 1 microfarad capacitor C6 by a 2.2 or 4.7 microfarads.
If, through the inverter S1, connects the base of transistor TR1 on pin 13 of IC2 / B, the relay is activated and remains in that position.
To disable it, before renewing the initial whistle or clap, he will wait until the electrolytic capacitor C6 is fully discharged.
The 1 megohm trimmer R6 which is connected between the output pin 6 and pin 2 of the first inverting operational amplifier IC1, ser t to set the microphone sensitivity.
For the operational amplifier IC1, I used a TL081, then I tried to replace it with an LS141 and an LF351. In all cases, installation works without needing any changes.
I recommend you solder the capacitor C3 100 nanofarads directly between pins 7 and 4 of IC1, above the integrated circuit.
If you want to place the microphone away from the PCB, you can do, the only requirement to use shielded cable.
As a microphone, I used an amplified microphone capsule which is connected to the mount with respect to its polarity.
For this relay microphone power, we must use voltage 12 volts continuous can be given for small block power of commerce.
Electrical diagram of the microphone switch.
Pinouts 4013 and TL081, microphone and BC547.Component List
R1 = 10 kW
R2 = 470 kΩ
R3 = 470 kΩ
R4 = 4.7 kΩ
R5 = 220 kΩ
R6 = 1 MΩ trimmer
R7 = 100 kΩ
R8 = 1 MΩ
R9 = 1 kΩ
R10 = 680 Ω
R11 = 10 kilohms
R12 = 47 kilohm
C1 = 100 nF polyester
C2 = 1 uF electrolytic
C3 = 100 nF polyester
C4 = 100 nF polyester
C5 = 100 uF electrolytic
C6 = 1 uF electrolytic
DS1 = 1N4150 silicon diode
DS2 = 1N4150 silicon diode
DS3 = 1N4150 silicon diode
Zener diode DZ 1 = 6.8 V 1 W
TR1 = BC547 NPN Transistor
S1 = Inverter
IC1 = TL081 Integrated
Integrated CMOS IC2 = 4013
RELAY 1 = Relay 12 V 1 RT
DL1 = Diode LED
MICRO. = Microphone with elec.
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