The frequency of this circuit, for the indicated components, is 1 kHz. Other operational amplifiers can be used, and the power supply must be symmetrical.
This circuit uses a heated filament as a sensor. With the air current it changes resistance, and...
Using a pair of CK722s, this booster step of a few milliwatts of power was obtained in a 1960...
In the figure we have the way to trigger a 7555 CMOS monostable with a positive pulse. The time...