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Fine Control SuperBright LED Pulser (1N4148)

2014-12-06 08:51  
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This article describes the Fine Control SuperBright LED Pulser (1N4148). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components:1N4148.

Four timing controls – 12V supply

Circuit diagram:

Fine Control Superbright LED Pulser


R1,R5,R12,R13___10K  1/4W Resistors
R2,R5___________10K  1/2W Trimmers or Lin. Potentiometers
R3______________47K  1/4W Resistor
R4______________22K  1/4W Resistor
R6_______________1K  1/4W Resistor
R7,R8,R9,R14___100K  1/4W Resistors
R10,R11__________2M2 1/2W Trimmers or Lin. Potentiometers
R15____________220R  1/4W Resistor

C1,C2__________100nF  63V Polyester or ceramic Capacitors
C3,C4___________22µF  25V Electrolytic Capacitors
C5_____________220µF  25V Electrolytic Capacitor

D1,D2________1N4148   75V 150mA Diodes
D3______________LED   Super Bright white (e.g. RL5-UV2030)

Q1____________BC337   45V 800mA NPN Transistor

IC1___________LM324   Low Power Quad Op-amp IC
IC2____________4093   Quad 2 input Schmitt NAND Gate IC

This circuit, designed on request for a Halloween prop, allows fine control of a pulsing Super Bright white LED. The four potentiometers or trimmers will set precisely: on, off, ramp up and ramp down time-delays respectively.
Ramp up and ramp down time-delays can be set roughly in the 1 – 15 seconds range, whereas on and off time-delays can range from a few seconds to about one minute.
A 12V battery or regulated power supply is required, provided it is reasonably stable. Total current drawing is about 25 – 30mA when the LED reaches maximum brightness.


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