Joule thief circuit schematic 2
#joule thief
#voltage booster
#LED driver
#low voltage
#energy harvesting
#transistor
#ferrite core
#oscillator
#DIY electronics
#battery powered
No description available.
Wide frequency oscillator
An oscillator/amplifier is resistively tunable over a wide frequency range. Feedback circuits containing operational amplifiers, resistors, and capacitors synthesize the electrical effects of inductance and capacitance in parallel between the input terminals. The synthetic inductance and capacitance, and therefore the...
Simple Transistor Amplifier Circuit Schematic and Explanation
This circuit does not function as effectively as it could. It was created when the designer had a limited understanding of circuit design. An improved schematic will be developed and posted later, featuring a better design. The schematic indicates "antenna,"...
Transistor Tutorial Power Amplifiers Part 4
An audio power amplifier can enhance weak signals from devices like tuners, CD players, or tape decks to fill a room with sound. This article emphasizes the operating principles and circuitry of low-frequency power amplifiers utilizing bipolar junction transistors (BJTs)....
The simple joule thief using AVR microcontroller
The Joule Thief is a straightforward and uncomplicated device, yet its functionality is remarkable. It can utilize a battery that is otherwise deemed unusable in any other electronic device, and it is very easy to construct on a breadboard due...
The oscillator and trigger circuit with operational amplifier
Figure a illustrates a multivibrator circuit capable of generating a square wave signal. Figure b depicts a flip-flop circuit that utilizes the falling edge of the input signal to produce a trigger pulse signal. Figure c represents a monostable circuit,...
Easy Build Motorcycle Alarm
The following circuit is a simple, inexpensive, and easy-to-build motorcycle alarm. The circuit requires only two transistors to drive a relay, which acts as a switch to activate a buzzer. Any number of normally-open switches can be used. Mercury switches...
temperature alarm circuit
Transistors are configured as a Darlington pair in this circuit. A thermistor is utilized to detect or sense heat. A 12K variable resistor is employed to adjust the activation of the buzzer at the desired temperature. The operation of the...
230V LED DRIVER CIRCUIT
This document presents a 230V LED driver circuit that operates without a transformer. The circuit utilizes five LEDs, although the number can be increased as desired. The absence of transformers significantly reduces both the cost and size of the circuit....
Amplifier input signal overdrive auto-protection
That circuit protects the overdriven signals going into an amplifier. Instead of a zener diode, we use a transistor. That way we ensure that the above the ordinary input voltages (1 volt r.m.s.) can be achieved without distortion. Also, the...