FM and VHF Transmitter (CB20572E)

Employing transistors of the time, this circuit was found in a documentation from 1963. The coils are according to the desired frequency range.

Polarity Indicator (CB219E)
This circuit uses the 741 Operational Amplifier to drive two LEDs. The LEDs indicate the signal of...
High Speed Cables
August 2017 - Amphenol's high-speed cables are available from Mouser Electronics in various...
Water Detector (CB231)
The sensor can be made using two bare wire or two screen with a piece of tisse between them. One...