We found this circuit in a technical documentation from the 1980s. The circuit is from Texas Instruments with components from that time, not very common today.
This indicator was found in a 1974 publication, but it can be fitted with the BC548 transistor or...
Found in documentation from the 1970s, this circuit for resistive loads uses a trigger...
According to the author of this project, from a documentation on espionage from the 1980s, this...