Dc lamp dimmer
A low power, low cost dc lamp dimmer for a two-wire portable "flashlight" can be realized with little or no heatsinking. In addition, a single potentiometer, R3...
Machine vision illumination stabilizer
The combination of Ql, Q2 and Ul form a hysteresis oscillator to stabilize lamp illumination. In operation, full wave bridge D3 operates directly from the ac li...
Pulsed infrared diode circuit
Ql and Q2 form a constant current drive defined by R2. (I approximates to the reciprocal of R2 in the circuit shown for values of I greater than 1 amp). The pul...
LED Electronic roulette
Ul (a 4046 PLL containing a voltage controlled oscillator or VCO, two phase comparators, a source follower, and a Zener diode) is used to produce a low-frequenc...
Led flasher IIV
This flasher circuit operates as a relaxation oscillator with Cl discharged periodically through the LED as the PUT switches on.
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Sequential ac flasher
This circuit uses a ring counter made up of Q3, Q4 and Q5. Q2 acts as an oscillator which triggers the SCRs Q3, Q4 and Q5 in sequence. When an SCR fires, a 0.2�...
Transistorized flashers
Transistors Ql and Q2 are connected as a free running multivibrator. The output, at the emitter of Q2, drives the base of the common emitter amplifier Q3, which...
Sequential flasher
A 555 timer, IC1, drives a 4017 CMOS decade counter. Each of the 4017's first four outputs drives a CA3079 zero-voltage switch. Pin 9 of the CA3079 is used to i...
2 Kw flasher with photoelectric control
CR1, CR2, CR3, and CR4 form a bridge circuit with the SCR across the dc legs. With light on the photoconductor PCI, CI charges through Rl to about 150 Vdc. The ...
Led flasher
A relaxation oscillator is used to flash an LED in the base circuit. Cl is charged slowly through R1 by the power source, then discharged periodically through R...
Low current consumption lamp flasher
The circuit is economical in components, and will work with virtually any transistors and is reliably self-starting. The voltage Vb can be taken from a divider,...
Lamp flasher II
Brief full-power flashes are obtained when the SCR conducts during positive half cycles of the line voltage. The SCR fires when the voltage at the divider, R3 a...
High-power battery-operated flasher
This flasher operates from a 12-volt car or boat battery. It offers 36 to 40-watts output, variable flash rate (up to 60 flashes per minute), independent contro...
Electronic light flasher
The blinking or flashing rate is determined by Ul, a 555 timer integrated circuit. Its output, at pin 3, feeds U2, a HI1J triac driver. That driver consists of ...
Alternating flasher
The flash rate is determined by CI and R4.
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Miniature light flasher
The lamp should be a No. 122, No. 222 or other similar, miniature incandescent lamp.
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Low voltage lamp flasher
The circuit is composed of a relaxation oscillator formed by Q1 and an SCR flip-flop formed by Q2 and Q3. With the supply voltage applied to the circuit, the ti...
Led bar-graph driver
The circuit uses CA3290 BiMOS dual voltage comparators. Non-inverting inputs of A1 and A2 are tied to voltage divider reference. The input signal is applied to ...
Lighting auto controller
The governor following is intended to regulate the light intensity incandescent 220 V. The components in a relatively few, which means it can easily be mounted ...
Multi-color LED driver
Have you ever wondered how many different colors can illuminate a LED? One, two or maybe three? Constructing this simple circuit, you will find it much more. Th...