Supercharged Joule Thief circuit
#joule thief
#voltage booster
#energy harvesting
#low voltage
#battery
#transistor
#oscillator
#LED
#DIY electronics
#power efficiency
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A Simple Transistor Based Motorcycle Alarm
A simple transistor-based motorcycle alarm circuit. This circuit is easy to build and designed to operate at 12 volts. However, by replacing the relay with one that has a 6-volt coil, it can also provide protection at that voltage.
The motorcycle...
30mA LED Dimmer
If you have ever attempted to dim an LED using a simple potentiometer, it is recognized that this method is not very effective. Similar to standard diodes, the voltage-current characteristic of LEDs is non-linear. Consequently, depending on the potentiometer setting,...
Sound Synchronized LED Video Tutorial
It is possible to synchronize the LEDs so that the speakers continue to play loudly while the LEDs are not always illuminated during music playback. The individual has a solid understanding of electrical concepts and is seeking a method to...
LED Torch circuit
A common issue with small flashlights is the limited lifespan of both the batteries and the bulb. For example, a typical incandescent flashlight consumes approximately 2 Watts, while the LED flashlight shown in Fig. 1 consumes only 24 mW. This...
Single junction transistor pulse width trigger circuit
A conventional single junction transistor trigger circuit is limited to producing narrow pulses due to the rapid turn-off characteristics of the single-junction transistor. To address this limitation, a PNP transistor is added to the single-junction transistor trigger circuit, which allows...
Larson Scanner with Joule Thief Circuit
D1 (Schottky diode) and C2 form a rectifier to create DC voltage from the Joule Thief. A Zener diode D2 is included to limit the voltage to 5.1V, preventing damage to the microcontroller, which has a maximum voltage tolerance of...
XENON STROBE
A two-transistor oscillator generates pulses at approximately 500 Hz to step up the voltage using a 300-mA filament transformer (T1, Radio Shack 273-1384) for charging storage capacitors C2 and C3, which are 250-V electrolytics. At the same time, capacitor C4...
Simple Short Finder Circuit
Transistors Q1 and Q2, along with resistors R1 through R7, form the input balancing stage that measures the resistance between points X and Y. This stage operates as a bridge circuit, incorporating resistors R1, R2, R6, R7, and the resistance...
A Mixed-Signal LED Clock
The term "mixed-signal" typically refers to circuits and integrated circuits (ICs) that process both analog and digital signals. In this context, the designation "A mixed-signal LED clock" may be somewhat misleading, as this is a fully digital clock. However, the...