how a joule thief circuit works
#joule thief
#voltage booster
#energy efficient
#low voltage
#battery
#transistor
#oscillator
#LED
#power saving
#DIY electronics
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Fine Control Super Bright LED Pulser
The circuit utilizes two white LEDs, with the second LED connected across the emitter of the transistor and the negative ground. It requires its own limiting resistor in series, similar to R15 and D3 in the circuit diagram. If standard...
Delayed ON LED
This is a simple circuit where an LED turns on only after a predetermined time once the power supply is activated. Initially, when the power supply is turned on, the transistor remains off. The capacitor charges through the preset resistor...
220V LED Flasher Circuit
This is an AC-powered LED flasher that can drive two high-bright LEDs directly from the power obtained from the AC lines. The high-bright LED flasher can be...
The AC-powered LED flasher circuit is designed to illuminate two high-bright LEDs using the...
blinking-led-circuits.html
This LED series will blink alternately. The operation is determined by the NE555 integrated circuit, with transistors used to reinforce each section (20 upper, 20 lower) for optimal performance. The 555 circuit described below functions as a flashing bicycle light...
two transistor led flasher
This circuit will flash a bright red LED (5000 mcd) as an attention-getting device or fake car alarm. Component values are not critical, and other transistors may be used. The flash duration is determined by R2 and C1 and is...
Multicolor HD LED
Most PC enclosures provide only a single LED to indicate hard disk access, with the LED being connected to the motherboard via a two-pin connector. However, this LED only works with IDE drives, and if a SCSI disk controller is...
1.5 Volt LED Flasher Circuits
The LED flasher circuits below operate on a single 1.5 volt battery. The circuit on the upper right uses the popular LM3909 LED flasher IC and requires only a timing capacitor and LED. The top left circuit, designed by Andre...
Mini Led Flashlight with LT1073 IC
This LED lamp circuit can be utilized as a mini LED flashlight. When paired with a 1.2 V rechargeable battery, all components can be housed within a compact enclosure.
The mini LED flashlight circuit typically consists of several key components: an...
Blinker Indicator
When the lamp turns off, a reset pulse is generated for the corresponding counter by NAND gate IC1. The counter then counts up again. The display's progression rate can be adjusted to the desired speed using potentiometer P1. Only one...