Band Pass Filter (CB19687E)

This bandpass filter has a simple feedback system. The component values can be calculated using the formulas found in the math section.

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Counter Up to 25 using the 4017 (CB10889E)
This circuit is from a Radio Electronics from May 1994. In it we have the way to connect three 4017...
Zener Regulated Transistor Power Supply (CB13064E)
In the figure we present an extremely simple circuit of a voltage source regulated by a zener...
AC and DC Test Tip (CB16604E)
We found this circuit in a 1987 documentation. It is a multi-tester with neon lamp and LEDs...