Low battery indicator 555 (CB9551E)

This circuit can operate with different voltages, depending on the zener used. We found it in a 90s American documentation.

Random Noise Generator (CB4914E)
This circuit is from a Linear Technology integrated circuit manual from the 1990s. The circuit...
6 W Audio Amplifier using the LM378 (CB442)
The IC used in this project is not common these days, but if you have one you can build a high...
LED Integrated Driver For 3 V (CB12597E)
With this circuit, it is possible to excite a white LED or another type of high brightness with...