Infrared modulated transmitter (CB7247E)

This simple Philips circuit from the 1960s can use any general-purpose transistor. The signal is modulated at 2.7 kHz.

SCR Delayed Drive Circuit (CB23960E)
This circuit was found in the July 1969 issue of Radio Electronics magazine. It also appeared in...
Optical AC Switch with Triac (CB25856E)
This circuit can function as a high-power shield completely isolated from the power grid. We found...
Fluorescent Inverter (CB18941E)
This circuit has as a critical component the transformer that has low voltage windings for the...