This is the ultrasonic receiver that used to receive the ultrasonic signal. When the signal is confirmed, it will ask the relay to do its job.
Ultrasonic Receiver Parts List:
RCVR = Ultrasonic Receiver 40-50khz
RL1 = 6volt 200ohm resistor
IC2 = CA3140
VR2 = 250k Variable Resistor
R6 = 390k Resistor
R7 = 470k Resistor
R8, R12 = 15k Resistor
R9 = 12k
R10, R13 = 10k
R11 = 4.7k
R14 = 100k Resistor
R15 = 33 ohm Resistor
C3 = 0.22uf ceramic capacitor
C4 = 0.1uf ceramic capacitor
C5 = 560n ceramic capacitor
T3,T4 = BC548 NPN Transistor
T5 = BC558 PNP Transistor
T6 = SL100 NPN Transistor
D3,D4,D5 = 1N4148 Diode