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.
This basic circuit can be used in signal followers and other applications where an RF signal is to be...
Using the well-known 2N107, one of the first commercial transistors, this circuit produces a 100...
This non-E or NAND port can be easily implemented using an operational amplifier. Equivalent...