The ports used in this ultrasonic remote-control transmitter are TTL, requiring a 5 V supply. The transducer is a piezoelectric type, not very common today.
A safe way to obtain a sinusoidal signal of excellent quality and low frequency without the need...
This circuit can measure audio output power up to 50 W. The circuit is wired to the output of an...
We found this circuit in a publication from the 1970s, but it can still be assembled today by...