Smart sinewave dimmer circuit

The LED meter circuit is more compact and simpler than its analog equivalent, making it a common choice in audio equipment. This circuit utilizes the LM3915 integrated circuit (IC) and operates in a logarithmic mode. It comprises a single IC...

LED stepdown power supply

Below is a proof of concept circuit which needs improvement. The part values shown will run a high efficiency red LED with a Vf of 1.9V from only 2 nicads, right down to 2 volts. For a white LED you...

LED Flasher IIV

This is a simple design of a single flashlight. This small circuit is within a half hour to build. The circuit operates from 4.5 to 12 V. Of course it is possible other than to drive an LED. More: R1,...

pulse width modulation

Pulse Width Modulation (PWM) is a highly efficient control scheme utilized to regulate the flow of power through various electronic devices. It is commonly found in switched-mode power supplies, LED dimming circuits, and variable speed motor controls, among other applications....

Battery less LED Footswitch Mod for the 2 Channels

For individuals seeking LED-based footswitching without the inconvenience of battery installation, a battery-less LED-based footswitch modification is being developed for 2-channel amplifiers. This solution is designed to work with the existing TRS jack and footswitch, and it will involve a...

Christmas light circuit

The chart illustrates a Christmas lights circuit that employs a simple and cost-effective CD4069 CMOS hex inverter to control four separate circuits, each consisting of 50 light-emitting diodes (LEDs), totaling 200 LEDs. The circuit is powered directly by a 220V...

LED TesterCircuit

Before using LEDs, it is advisable to test them. An LED tester allows for testing even in low light conditions. LEDs are available in various shapes and colors, with some featuring clear, colorless packages and others having colored plastic packages....

classic led flasher circuit

This LED flasher circuit is a classic two-transistor flip-flop. It is a popular circuit often built by beginners in the electronics hobby. The schematic diagram of this well-known LED flasher circuit includes two transistors, two capacitors, four resistors, and two...

LED Battery Checkers

The Battery Good checker. When the button is pressed, the green LED will glow if the battery voltage is above the preset threshold. This version has a higher parts count than the Battery Low version, but a bonus is that...