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LED and Light Circuit

Index 5

Uncoupling Ramp Driver

Published:2013/6/13 21:24:00 Author:muriel | Keyword: Uncoupling Ramp Driver

Uncoupling Ramp Driver
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10, 8 And 6 Step LED Circuits

Published:2013/6/13 21:24:00 Author:muriel | Keyword: 10, 8 And 6 Step , LED Circuits

10, 8 And 6 Step LED Circuits
Each time switch S1 is closed the count on the CD4017 advances by 1 step and the coresponding LED turns on. When the maximium count plus 1 is reached for each circuit the cycle is restarted and repeats. (View)

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Diode Type Constant Lighting Circuits

Published:2013/6/13 1:37:00 Author:muriel | Keyword: Diode Type, Constant Lighting Circuits

Diode Type Constant Lighting Circuits
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Ash Pit Dimmer Circuit

Published:2013/6/13 1:24:00 Author:muriel | Keyword: Ash Pit Dimmer Circuit

Ash Pit Dimmer Circuit
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High Current - Crossing Light Flasher (LM556)

Published:2013/6/6 20:51:00 Author:muriel | Keyword: High Current , Crossing Light Flasher , LM556

High Current - Crossing Light Flasher (LM556)
This following circuit shows a simple grade crossing flasher with enough current capacity to drive 12 Volt lamps with 2 Amps current draw. The circuit could be used for open house displays, etc. The flasher is driven by an LM556 dual time configured in a Push-Pull arrangement. The flash rate can be adjusted by varying the value of the 500K ohm variable resistor. The flash rate is calculated as being from 0.54 to 3.1 Hertz. The only real concern with this circuit is the need for a 12 volt power supply large enough for the current required by the lamps. The #1156 automotive lamps specified are rated at 2.1 amps but as only one light is on at a time the current draw for the circuit would be just slightly above 2.1 amps. Other lamps such as the #1141 draw less current. (View)

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Push-Pull - Crossing Light Flasher

Published:2013/6/6 20:50:00 Author:muriel | Keyword: Push-Pull, Crossing Light Flasher

Push-Pull - Crossing Light Flasher
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Synchronous Crossing Light Flashers

Published:2013/6/6 20:50:00 Author:muriel | Keyword: Synchronous Crossing Light Flashers

Synchronous Crossing Light Flashers
In the synchronous flasher control the oscillator is running at all times and the power to each set of flashers is turned on or off by the control circuit for that crossing. This allows any number of flasher sets at different crossings to controlled individually and yet flash in unison. Two versions of the flasher output control are shown. In OUTPUT 1 the lights are turned on when the control circuit goes to the common of the circuit. In OUTPUT 2 the lights are turned on when the control circuit goes to the positive supply of the circuit or some other supply source. In either case the PNP and NPN transistors above and below the LED's are turned on and the crossing lights will flash. IF more than one set of flashers is used at a particular crossing the LED's could be wired in series so as to keep the number of output control circuits to a minimum. This is shown on the basic flasher schematic. (View)