This is the ultrasonic transmitter schematic diagram. This circuit will generate ultrasonic signal frequency 40 and 50 kHz and transmit to the ultrasonic receiver.
Ultrasonic Transmitter Parts List:
IC1 = NE555 timer IC
VR1 = 10k variable resistor
R1 = 4.7k resistor
R2 = 18k potentiometer
R3 = 1k resistor
R4, R5 = 220 ohm resistor
C1 = 680 picofarad capacitor
C2 = 0.01uf capacitor
D1, D2 = 1N4148 Diode
T1 = SL100 NPN transistor
T2 = SK100 PNP transistor
S1 = SPST momentary contact switch
XMTR = ultrasonic transmitter 40-50khz