Lights and Display Board CircuitsRemote Circuit Diagrams

Momentary-action push-bitton

The circuit described here is a kind of remote control for all sorts of equipment that must be started or switched on with the aid of a trigger pulse. The authoress actuates it with a flash of the headlights to switch on the garage lights When light falls on to the six series-connected solar cells, T1 is switched on, which results in T2 being switched off. Capacitor C2 is then charged.

When the light is removed from the cells, T1 is switched off and T2 is switched on. Capacitor C2 will then be discharged through the LED of the electronic remote which is consequently energized for the instant. in that way, trigger pulses are generated for electrical isolation and equipment without the need of an additional power supply.

In the diagram, C1, R1, and R2 ensure stable switching operation.

The solar cells used in the prototype gave an effective range of 2–3 m (7–10 ft).

The circuit is intended as a momentary action push button, not as a locking switch. The latter function may  be obtained by adding, for example, a latching relay

The capacitor is a device and it does not have a unit. The capacitance of the capacitor is the ratio of the charge stored in either one of the conductors of the capacitor to the potential difference between the conductors. The SI unit of capacitance is farad.
capacitor, a device for storing electrical energy, consisting of two conductors in close proximity and insulated from each other. A simple example of such a storage device is the parallel-plate capacitor.
The governing equation for capacitor design is C = εA/d, In this equation, C is capacitance; ε is permittivity, a term for how well dielectric material stores an electric field; A is the parallel plate area, and d is the distance between the two conductive plates.
A capacitor works on the principle that the capacitance of a conductor shows increases when an earthed conductor is brought near it. Therefore, the capacitor has two parallel plates facing each other in opposite directions and are separated by some distance or gap.

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