These two circuits make a LED fade on and off. The first circuit charges
a 100u and the transistor amplifies the current entering the 100u and
delivers 100 times this value to the LED via the collector-emitter pins.
The circuit needs 9v for operation since pin 2 of the 555 detects 2/3
Vcc before changing the state of the output so we only have a maximum of
5.5v via a 470R resistor to illuminate the LED.
Parts
1x - NE555 Bipolar Timer
1x - LED (Red) 1x - 470 Resistor (1/4W)
1x - 33K Resistor (1/4W)
1x - 100�F Electrolytic Capacitor (16V)
1x - BC547 NPN Transistor
1x - 9V Voltage Battery
Parts
1x - NE555 Bipolar Timer
1x - LED (Red) 1x - 470 Resistor (1/4W)
1x - 33K Resistor (1/4W)
1x - 100�F Electrolytic Capacitor (16V)
1x - BC547 NPN Transistor
1x - 9V Voltage Battery
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