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
This schematic diagram come from circuit: Ultrasonic Sensor Switch
Go to that page to read the explanation about above circuit design.
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In electronic design automation, until the 1980s schematics were virtually the only formal representation for circuits. More lately, using the progress of computer system technology, other representations were introduced and specialized computer languages were developed, because with the explosive development of the complexity of electronic circuits, classic schematics are getting less practical. As an example, hardware description languages are indispensable for contemporary digital circuit design.