Basic Joule Thief schematic
#joule thief
#voltage booster
#low voltage
#LED driver
#energy efficient
#battery
#transistor
#oscillator
#DIY electronics
#power conversion
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Sonic Defender
This oscillator-driver produces a loud sound of approximately 3 kHz, modulated with a 10-Hz warble. BZ1 is a Matsushita EFB-RP3. U1A generates the 10-Hz waveform that modulates the 3-kHz tone produced by U1C and U1D. Q1 drives the transducer through...
Single-junction transistor a phase-shift trigger circuit
Figure 16-29 (a) illustrates the trigger output through a resistor R2, while Figure 16-29 (b) depicts the integration of a programmable unidirectional transistor (PUT) trigger circuit. The adjustable potentiometer RP can modify the conduction angle of the TRIAC to facilitate...
Last-cycle-completing-gated-oscillator
Regenerative feedback at capacitor C allows the oscillator to complete its timing cycle instead of shutting off immediately. The integrated circuit (IC) used was a CD4011AE, although an equivalent IC will also function.
The described circuit utilizes regenerative feedback to enhance...
joule thief circuit boosts voltage from 1.5V battery
Like all joule thieves, this circuit boosts the voltage from a single 1.5V dry cell battery high enough to illuminate ultrabright GaN blue, green, or white LEDs. Instead of requiring a custom coil, it utilizes an off-the-shelf standard Kemet SU9H-07010...
VHF/UHF TV Modulator
A simple oscillator generates a frequency in the VHF or UHF range. This oscillator is modulated with a video signal, and the resulting modulated carrier wave is transmitted to the TV set's aerial input through a cable. The final step...
A lamp flasher circuit using transistors
If you require a small lamp that flashes for general use, there are numerous options available. Today, three lamp flasher circuits will be presented.
The three lamp flasher circuits can be designed using different components and configurations, each offering unique characteristics...
Reverse Joule Thief Battery Charger circuit
This design presents an innovative approach to the Joule Thief (JT) circuit typically utilized in garden lights. Instead of directly charging a 1.2V battery from the solar cell and converting the power to operate a 3-volt LED, this circuit employs...
LM3551 LM3552 led driver schematic circuit design
The LM3551 and LM3552 are fixed frequency, current mode step-up DC-DC converters featuring two integrated NFETs. These devices facilitate the design of a straightforward and highly precise LED brightness control system. They are capable of driving loads up to 1A...
Bipolar Transistor HBridge Motor Driver
Schematic, breadboard photo, parts list, and results of several transistor variations on the classic bipolar H-bridge motor driver circuit.
The classic bipolar H-bridge motor driver circuit is a widely used configuration that allows for the control of DC motors in both...