Found in a 1988s Radio Electronics, this circuit uses transistors of general use to increase the intensity of signals up to about 30 MHz. The power can be done by battery because the consumption is low.
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...