This traditional crystal oscillator configuration can use any CMOS gate configured as an inverter. R1 has values from 1 to 5 M ohm and R values around 10 k.
This circuit that emits siren sound can be used in a fire alarm. We found it in an old American...
This circuit generates sinusoidal signals from 15 Hz to 15 kHz. The circuit is from Electronics Now...
In the figure a circuit that is the basic application of NE567 for the detection of a tone applied to...