Broadband Amplifier (CB21860E)

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

Recorder Head Preamplifier (CB18575E)
We found this commercial circuit sold as PT-40 in Japan in the 1960s in a documentation of the...
Hartley Oscillator (CB12067E)
This audio oscillator can also be frequency controlled by an LDR. The circuit is from a 1975...
Diac Voltage Sensor (CB12992E)
The circuit shown in the figure is triggered by an input voltage determined by the setting of P1....