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Category: Inside Circuits Views: 187 Rank: 2 A flip of 51 puts the system in action. Power for the circuit is captured from the ignition switch, and circuit receives no power until the ignition switch is closed. When the camera is turned on, the capacitor C1 is charged and the emitter follower Darlington pair (formed by Q1 and Q2) are cut, so no voltage is applied to the relay (Kl), which serves as a load QL transmitter. normally open relay contacts are connected through the points of the vehicle. (At this point, the relay contacts are open and have no effect on the ignition system). Cl charges through R, causing the voltage at the base of Ql to rise steadily.  This creates a similar increase in the voltage at the emitter of Q2. A Darlington pair is used to provide a high input impedance buffer stage so that the voltage across C2 is free to increase the potential of near full power. effects of loading does not limit the potential burden of a few volts. Finally, the voltage applied to the relay becomes sufficient to enable it. Close contacts and short points. The ignition system now does not work properly and the vehicle is down. If the ignition is off, power is removed from the circuit and the diode Dl, which used reverse-biased, has become polarized by the charge of C1. Dl allows C1 to discharge rapidly through R2 (and all other routes current through supply lines). The circuit is ready to operate when the ignition is on again. The engine works, but not for very long. The values of R1 and C 1 has a delay of about 25 to 30 seconds. Increasing the value of R1 to provide a longer period.
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