Video Amplifier (CB26320E)

This circuit was found in a William Sheets. It has 75 ohms of output impedance and can operate up to 20 MHz with the components used.

Optical Gain Control (CB6324E)
This simple circuit controls the signal amplitude through a photoresistor optical coupler. The...
Or exclusive with transistor (CB7249E)
In the figure we have the way to obtain the Exclusive-OR function with 1 transistor. The circuit...
Experimental Bicycle Speedometer (CB18710E)
This circuit uses as an indicator a common micrometer type VU with 200 uA of full-scale current. The...