This interesting circuit of the 50s uses a fluorescent lamp to obtain a stroboscope useful for the rotation of motors. The circuit uses a power valve to control the 10W fluorescent lamp.
This circuit was found in a 90s Popular Electronics. The frequency is determined by R3 and C1 that...
This circuit also detects IR, providing LED indication. The circuit is used to indicate humidity in...
This PNP transistor power stage was found in the May 1969 issue of Radio Electronics magazine. The circuit...