Null Indicator (CB21930E)

This bridge was found in a Raytheon transistor manual from the 1960s. The transistors are germanium from the time.

Insect Repellent (CB17682E)
The proposed circuit generates signals in the range between 9 kHz and more than 44 kHz, which, it is...
Integrated FM Radio (CB14571E)
This circuit uses currently uncommon components, including the 10.7 MHz (FI) filter. This circuit was...
Mini Power Supply (CB1411E )
This small power supply for low currents (5mA) is suitable for power low-power TTL experimental circuits....