This circuit was obtained in a Hobbyst Handbook from 1990. The circuit can be easily assembled since the SCR can be a TIC106 and the transistor a 2N30555.
This circuit indicates the logic level of a digital signal. LEDs can replace the lamp, wired with...
The integrated circuit used in this stereo preamp is uncommon today, but the circuit can be...
This circuit appeared in the September 1973 issue of Radio Electronics magazine and was...