This 1968 Hughes circuit uses period components and operates at 8 Hz. Current equivalent components may be employed. Note the high supply voltage.
When the sensor of this circuit is cut for a moment, the second 555 produces a tone for a time...
This two-stage circuit has a voltage gain of 100 times, with a high input impedance. The circuit is...
A quartz crystal-controlled oscillator, capable of operating up to approximately 1 MHz, can be...