Electronics

LED Flasher using NE555

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LED Flasher circuit using NE555 timer IC   R1, R2, C1 and the supply voltage determine the flash rate. For a variable flash rate, replace R1 with a 1 MΩ pot in series with a 22k resistor. The purpose of R3 and R4 is to limit current through the LEDs to the maximum they can handle […]

Electronics

Lamp Dimmer

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12v LAMP Dimmer Parts IC 1 – NE555 Transistor – 2N2955 -1 Resistance – 1k(2 no.), 100 Ω Variable Resistance – 50k Capacitor – 0.1 µF Diode – 1N4001 – 3  12v 2 amp Bulb Input Voltage is 12v. To create your own bench top power supply use the circuit shown in http://digitalab.org/2012/06/regulated-dc-power-supply-circuit/