The circuit is from the 1994 National Semiconductor Linear Applications Handbook but can be implemented with more modern operational amplifiers. The power supply must be symmetrical.
This circuit is intended to measure the power of a transmitter for the citizen's band (11 meters or...
This metronome can use either a high impedance phone or a crystal phone. You can use a small...
The circuit shown in the figure modulates a low power infrared LED with TTL signals. The circuit can...