This circuit is from a 60's documentation. The capacitance C1 can be between 20 pF and 0.01 uF depending on the generated frequency. Equivalent transistors may be employed.
The presented circuit can excite small piezoelectric transducers or ceramic buzzers. These...
This simulation shows how to use an operational amplifier as a voltage comparator. The sample uses the...
Maxim MAXREFDES67 Universal Analog Input Micro PLC is ideal in factory automation because of its...