4 LED VU meter LM324 circuit | Next Electronics

This circuit was designed on request and can be useful to those wishing to have, say, a red LED illuminated when an appliance is on and a green LED illuminated when the same appliance is off. Any mains operated appliance...

making led flash every 0 6 seconds

A question about electronics involves a project to create a simple circuit that causes an LED to flash. To design a circuit that makes an LED flash, a basic understanding of electronic components and their configurations is essential. The simplest method...

Dark Seeker - TV-to-Scope Converter

The VGA-to-Scope converter schematic has been simplified by removing op-amp buffers and inverters. A 1 Megohm potentiometer can be used instead of a continuous current supply to charge the capacitor from a 5V source. Proper placement of the potentiometer allows...

Audio VU Level Meter Circuit with LM324

This weblog discusses electronic circuit schematics, PCB design, DIY kits, and electronic project diagrams. The 1K resistors in the circuit are significant as they allow the LEDs to activate at different audio levels. While these resistors can be modified, using...

High-Brightness LED Grow-Light

This project page has evolved into a design discussion. Constructive suggestions and collaboration are still welcome. Please refer to the comments section. The project focuses on the development of an electronic circuit design, which has transitioned from a simple project overview...

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...

Regulated LED Lamp

The LM317L and resistor act as a current regulator set to 40ma. Current flows from the battery through one pair of LEDs, through the regulator, through the other pair of LEDs, and back to the battery. The capacitor filters out...

1.5V LED Flasher Oscillator

The 8-lead plastic mini-DIP LM3909 integrated circuit was developed by National Semiconductor in the mid-1970s. It is a monolithic oscillator specifically designed to flash Light Emitting Diodes (LEDs). By utilizing the timing capacitor for voltage boosting, it can deliver pulses...

op amp Reducing noise in audio circuit (optical pickup + op amp)

A passive high-pass filter has been added after the output of the operational amplifier (op-amp) to eliminate DC offset, with the op-amp powered by +12V and the negative supply at 0V. A feedback resistor (Rf) of 500K Ohms is utilized,...