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.

DC to DC Converter (CB6580E)
This circuit was found in an American documentation from 1970. We can increase the number of...
AC Amplifier CA3080 (CB25132E)
This AC amplifier has a gain of 40 dB. It was found in the May 1988 issue of Radio Electronics magazine....
Precision Voltage Reference (CB16040E)
The presented circuit serves as a voltage reference for instrument adjustment. The diode used as a...