Emergency Light
this circuit designed in case of electrical power is fence without notice.
Operation:
The R1 is 100R Ohm to help decrease the current flowing in the capacitor C1 which reduces the voltage as a voltage source without transformer, diodes D1 and D2 rectify the wave, helps stabilize C2 as direct current, the idea is that the voltage passing through diode D2 properly polarized base transistor Q1, thus its collector remains in low level, which results in the transistor Q2 does not lead, and incidentally, it will block the conduction of transistor Q3. When no current flowing through D2, ie no AC, transistor Q1 does not conduct because its base has a low voltage level which means that its collector maintains the highest level from the batteries through R3. This allows the transistor Q2 is polarized step correctly and the transistor Q3. Allowing, with the latter step current flowing from the batteries through the led.
Elements Used:
- 1 Ohm resistor 100R 1 / 2 Watt.
- 1 Ohm resistor 100R 5 Watt.
- 1 10K ohm resistor 1 / 2 Watt.
- 1 resistance 2.2K Ohm 1 / 2 Watt.
- 1 220nF Polyester Capacitor 250V.
- 2 diodes 1N4007.
- 1 1N4148 diode.
- 1 Capacitor 4.7uF 25V.
- 3 2N3904 transistors.
- 3 Ultra-bright LED.
- 1 9V battery.
Operation:
The R1 is 100R Ohm to help decrease the current flowing in the capacitor C1 which reduces the voltage as a voltage source without transformer, diodes D1 and D2 rectify the wave, helps stabilize C2 as direct current, the idea is that the voltage passing through diode D2 properly polarized base transistor Q1, thus its collector remains in low level, which results in the transistor Q2 does not lead, and incidentally, it will block the conduction of transistor Q3. When no current flowing through D2, ie no AC, transistor Q1 does not conduct because its base has a low voltage level which means that its collector maintains the highest level from the batteries through R3. This allows the transistor Q2 is polarized step correctly and the transistor Q3. Allowing, with the latter step current flowing from the batteries through the led.
Elements Used:
- 1 Ohm resistor 100R 1 / 2 Watt.
- 1 Ohm resistor 100R 5 Watt.
- 1 10K ohm resistor 1 / 2 Watt.
- 1 resistance 2.2K Ohm 1 / 2 Watt.
- 1 220nF Polyester Capacitor 250V.
- 2 diodes 1N4007.
- 1 1N4148 diode.
- 1 Capacitor 4.7uF 25V.
- 3 2N3904 transistors.
- 3 Ultra-bright LED.
- 1 9V battery.
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