This circuit is from an old Signetics documentation. It can be implemented with modern operational amplifiers. The power supply must be symmetrical.
This circuit was found in a 1987 publication. A 4017 sequentially counts time in steps set by...
This circuit using a SIDAC is suggested by ON Semiconductor in its thyristor manual. The circuit...
Audio frequencies in the 300 Hz to 30 kHz range can be measured with this circuit. Transistors allow...