4046 Two-Phase VCO (CB25757E)

This circuit was found in the August 1994 issue of Electronics Now magazine. The 4046 is uncommon these days and the frequency range is given by C1.

| Clique na imagem para ampliar |

Timer 4001 II (CB15513E)
In the figure we show a timer, this simple one with only one of the four gates of integrated...
Photodiode Amplifier LM139 (CB15527E)
This circuit is a sensor for photodiodes that can be used in optical couplers, encoders and other...
Crystal tester (CB8219E)
This crystal tester was found on a 90s Ham Radio. Transistors are commonly used. The circuit is for...