This telecommunications circuit was found in a National Semiconductor publication from the 90s. It is intended to convert the voltage from 48 V of telephone lines to 5 V with currents up to 1 A.
circuit is used to increase the sensivity of a relay. A 50 to 100 mA relay can be triggered with...
This circuit was obtained in an 1975 English publication. It is a voltage regulator circuit for...
This small FM spy transmitter uses three transistors with an RF amplification stage. We found it...