Rail to Rail Oscillator 555 (CB9099E)

Found in an Electronic Design from the 80s, this circuit generates a 500 Hz signal and can be used as a shield

Variable Flasher LM3909 (CB25425E)
This configuration was found in the January 1992 Radio Electronics magazine. The frequency is set...
Active Inductor (CB5342E)
This circuit is from an 80's electronic component manual. It has the way to simulate an inductor...
Low Resistance Linear Ohmmeter (CB25733E)
One of the problems with common multimeters, especially analog ones, is that their low resistance scales...