Broadband Amplifier (CB21859E)

This circuit has a voltage gain of 30 times and passband of 14 MHz. The circuit is from the 1974 Ferranti transistor manual.

Electronic Thermometer (CB21356E)
This analog thermometer was obtained from an English documentation. The sensor is a common diode...
Step variable power supply (CB8893E)
Found in Popular Electronics from the 90s, this 1.5 A power supply can supply voltages selected by a...
Photoelectric alarm with LDR (CB23799E)
This circuit was found in Radio Electronics magazine from February 1962. The sensor is an LDR, and the...