This circuit was found in a 1977 timer cookbook. The circuit can generate signals with up to 99% active cycle. The FET can be BF245 or MPF102 and the basic frequency given by R1, R2 and C1.
This latched alarm uses a double relay for this purpose and can control higher power external...
This circuit was found in an old American documentation on telecommunications. It is suitable for...
Taking advantage of the comparator setting, we can use the Norton amplifier as an over temperature...