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Homework Statement
This is the 40 kHz oscillator used to transmit an ultrasonic burst or “ping”. It uses the
LM555 timer configured as an A-stable oscillator. Design the circuit to obtain a 40
kHz square wave signal. Potentiometer P1 is used to adjust the output frequency to
precisely 40 kHz. Notice that the output of this oscillator is connected to a NAND
gate before feeding it to the ultrasonic transmitter. The CMOS output of the NAND
gate drives the ultrasonic transmitter much better than the LM555 timer alone. This
oscillator is enabled and disabled by the oscillator of point H by means of connecting
pin 4 of the LM555 (Reset) to the output of the NAND gate.
Homework Equations
The task is to build an ultrasonic range finder, there are several circuits split into several parts.
The Attempt at a Solution
I have no idea where to start. Any help would be greatly appreciated