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.
Mouser Electronics offers a vibration sensor which is considered the smallest in its class. This...
This circuit acts as a NOR gate for LED drive from TTL outputs. The circuit must be powered from a 5...
This circuit can serve as a basis for a robot that follows a line on the ground. The circuit has...