Found in Radio Electronics from the 90s, this circuit is intended for analog TV applications of the time. The transistor used as well as the module are uncommon components today.
The figure shows how to obtain a locking relay for an alarm circuit with sensors in series and in...
Found in Popular Electronics from 1969, this circuit uses a neon lamp from the time that had...
This is a simple rheostat circuit for motor control that works with voltages from 6 to 12 V. The...