This circuit generates pulses whose frequency depends on C1. The circuit can be powered by voltages from 5 to 15 V. We find this configuration in a Signetics manual.
This circuit that appears in several versions in this section and on this website was found in...
Using an operational amplifier with FET, this circuit was found in an English documentation from...
The MC4741 consists of a quadruple 741. The power supply must be symmetrical, and the resistors must be...