fake car alarm light circuit | Next Electronics

Transistor Q1, a 2N3563, and its associated components form an oscillator circuit that will oscillate if, and only if, a good crystal is connected to the test clips. The output from the oscillator is then rectified by the 1N4148 signal...

Electronic dice with 7 LED

This project takes advantage from -HOLD input, which is connected to push-button P1. As long as the -HOLD input is low, truth table's timeouts have no effect because this input serves to disable any state change provoked by timers. The...

1 5 volt led flashers

The LED flasher circuits operate on a single 1.5-volt battery. The circuit on the upper right utilizes the widely used LM3909 LED flasher integrated circuit (IC) and requires only a timing capacitor and an LED. The LM3909 is a specialized integrated...

LED Lighting For Consumer Unit Cupboard

The consumer unit cupboard in some older houses is poorly illuminated. If a bell transformer is also situated in this cupboard, it can be utilized to provide emergency lighting using two high-current LEDs. These diodes are powered through a small...

Battery Operated LED Lantern

Photo. This is the test circuit -the basic driver is only two transistors, two resistors, the circuit was evaluated using a white LED, but when it was time to button it up and archive it, I replaced the expensive white...

10 LEDs VU meter

The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs providing a logarithmic 3 dB/step analog display. LED current drive is regulated and programmable, eliminating the need for current limiting resistors. The IC contains...

12 V battery charger

This circuit is a high-performance charger for gelled electrolyte lead-acid batteries. The charger quickly recharges the battery and automatically shuts off when it reaches full charge. Initially, the charging current is limited to 2A. As the battery voltage rises, the...

Electronic projects

The LED moving font consists of individual modules, each containing 64 LEDs arranged in an 8x8 matrix. These modules can be cascaded to achieve the desired font size. Each module is managed by the LED display driver MAX7219 (or MAX7221),...

led lighting for 6v vehicles

This design replaces the incandescent bulbs in the stop, tail, and indicator lights of an MZ or other motorcycle with a six-volt electrical system using high-intensity Lumiled LEDs. This modification offers several advantages: a single Lumiled consumes approximately 1.2W yet...