My Light Diagram

This circuit detects the correct closed condition of the left and right side bags in a motorcycle companion. The bag has two locks that you must close for protection. Bicolor LED Driver Uses Two Leads Circuit Diagram: When you push the two momentary SPDT (single-pole/double-throw) switches, they sense the correct closed bag. One bicolor red-and-green LED indicates the bag’s status, with the red color showing the open-bag condition. To illuminate the LEDs, you must reverse the polarity of the applied voltage to the LED to change the color (Table 1). Diodes D 1 and D 2 and resistor R 1 form a discrete OR gate. When either pushbutton switch connects to 12V, the voltage at Point A is positive with respect to Point B. Transistor Q 1 conducts, letting current illuminate the red LED. When neither switch connects to 12V, neither diode conducts. The base of Q 1 pulls low through R 1 and R 4 , indicating that the bags are closed. Thus, the green LED illuminates as current passes through it a...

unpolarised capacitor symbol   polarised capacitor symbol Capacitance Capacitance (symbol C) is a measure of a capacitor's ability to   store charge . A large capacitance means that more charge can be stored. Capacitance is measured in farads, symbol F. However 1F is very large, so prefixes (multipliers) are used to show the smaller values: µ (micro) means 10 -6  (millionth), so 1000000µF = 1F n (nano) means 10 -9  (thousand-millionth), so 1000nF = 1µF p (pico) means 10 -12  (million-millionth), so 1000pF = 1nF Charge and Energy Stored The amount of charge (symbol Q) stored by a capacitor is given by: Charge,    Q = C × V   where: Q = charge in coulombs (C) C = capacitance in farads (F) V = voltage in volts (V) When they store charge, capacitors are also storing energy: Energy,    E = ½QV = ½CV²     where  E = energy in joules (J). Note that capacitors return their stored energy to the circuit...