Timer. - This is electronic circuit schematic of Mini Emergency Light using Transistor BD140 like in Figure 1 below. In this circuit schematic the basic component used are transformer and transistor BD140.
In here we will give you global description about Mini Emergency Light using Transistor BD140 and then we will give you link to continue your reading from original source as external website.
In here we will give you global description about Mini Emergency Light using Transistor BD140 and then we will give you link to continue your reading from original source as external website.
Circuit Schematic
Component Part
- Q1___BD140__PNP transistor
- C1____470uF 16V Electrolytic capacitors
- R1____22 ohms 1W
- R2____560 ohms
- D1,D2___1N4007 Diode
- T1______6V 0.5A transformer
- and other
Description
Circuit schematic like in Figure 1 above is Circuit Schematic Mini Emergency Light using Transistor BD140. Eleccircuits site describe that It works like the general emergency light; it fixtures are used to automatically provide lighting in the event of a power outage.
1. The charger section electrical energy storage in normal conditions.
2. The controller to drive the lamps light up when is power outage.
The tiny emergency light are also special, do not uses the relay to ON-OFF the lamp. But use the transistor, it acts as the switch ON-OFF instead, may be called a solid-state emergency light was.
Working began from AC power is fed into the circuit.
To fuse F1 as a blocker than the current flow may be caused by the mistakes of the circuit.
The transformer T1 will reduce the AC voltage 220V to lower about 6 volts. The AC low voltage will be rectified by diode D1 as half rectifier form. Then DC voltage will flow to resistor R1 and D2 to the battery. The charger current of circuit will set at 55 mA
When plugged into the circuit, the LEDs are not lit. Because the base lead of transistor Q1 get Reverse Bias has higher voltage than the emitter leads. The transistor will “OFF” own conduct. But when the power outage at the base leg voltage is reduced.
1. The charger section electrical energy storage in normal conditions.
2. The controller to drive the lamps light up when is power outage.
The tiny emergency light are also special, do not uses the relay to ON-OFF the lamp. But use the transistor, it acts as the switch ON-OFF instead, may be called a solid-state emergency light was.
Working began from AC power is fed into the circuit.
To fuse F1 as a blocker than the current flow may be caused by the mistakes of the circuit.
The transformer T1 will reduce the AC voltage 220V to lower about 6 volts. The AC low voltage will be rectified by diode D1 as half rectifier form. Then DC voltage will flow to resistor R1 and D2 to the battery. The charger current of circuit will set at 55 mA
When plugged into the circuit, the LEDs are not lit. Because the base lead of transistor Q1 get Reverse Bias has higher voltage than the emitter leads. The transistor will “OFF” own conduct. But when the power outage at the base leg voltage is reduced.
And now you can read more you knowledge about Circuit Schematic Mini Emergency Light using Transistor BD140 from the original source article using link [here].
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