Motor Circuit DiagramsUPS - Inverter - Power Generator Circuits

Starter for model aircraft

Model aircraft tend to be realistic reproductions of the real thing. That means, among others, that starting the petrol engine must be done by hand or with an external electric starter. Manual starting may be realized in two ways: with the circuit in Fig. 1 or with that in Fig. 2.

The circuit in Fig. 1 places a 3-V relay between the starter and the motor. When the starter switch is closed, nothing happens. But if then the propeller is turned by hand. the motor acts as a generator and, once it is turned fast enough, the generated voltage is high enough to energize the relay, whereupon the motor starts. An advantage of this is that it is a purely mechanical operation, which is readily incorporated. A disadvantage is that once the relay is energized, it is operated by a 6-V supply: a slight waste of energy.

The circuit in Fig. 2 is rather more economical since it uses a 6-V relay. Again’ the motor is used as a generator operated, by turning the propeller. The generated voltage is applied to the base of T1 via.8:1 When the base is supplied with sufficient current, the transistor is switched on. The relay is energized and the motor starts. The starting point can be preset with P1.

Starter for model aircraft Schematic diagram
Starter for model aircraft Schematic diagram

A transistor is a type of semiconductor device that can be used to both conduct and insulate electric current or voltage. A transistor basically acts as a switch and an amplifier. In simple words, we can say that a transistor is a miniature device that is used to control or regulate the flow of electronic signals. Transistors are broadly divided into three types: bipolar transistors (bipolar junction transistors: BJTs), field-effect transistors (FETs), and insulated-gate bipolar transistors (IGBTs).
A transistor can act as a switch or gate for electronic signals, opening and closing an electronic gate many times per second. It ensures the circuit is on if the current is flowing and switched off if it isn’t. Transistors are used in complex switching circuits that comprise all modern telecommunications systems.

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