a dual alternating flashing light circuit
#flashing lights
#LED
#alternating lights
#dual lights
#timer circuit
#astable multivibrator
#visual indicator
#12V circuit
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brain wave machine
A simple design for brain-wave goggles can be created using appropriate eyewear, such as safety glasses, along with an array of Light Emitting Diodes (LEDs). The control of the LED flash rate is managed through the PC's parallel port. Audio...
LED or Lamp Flasher
Flashing frequency can be varied by changing R1 value in the 1M - 4M7 range. This circuit is very efficient when driving a small 3.2V incandescent lamp. In this case omit the LED and R3, connecting the bulb across Q2...
simple and cheap dark detecting led
How can an LED be activated in low light conditions? This scenario, often referred to as the "nightlight problem," is applicable in various situations such as emergency lights, street lights, and even computer keyboard backlights. There are numerous solutions available....
LEDs Revisited
LEDs come in various sizes and shapes, with the most common being round-topped cylinders with diameters of either 3 mm or 5 mm. These sizes are often referred to as T1 (3 mm) and T1 (5 mm). The body of...
LED Crystal Tester
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...
LED VU Meter by IC LM3914 PCB
This is an LED VU Meter circuit using the LM3914 IC, designed to visually represent audio signals in stereo or sound applications. The circuit is straightforward to assemble, utilizing a single integrated circuit (IC) to display 10 levels of audio...
LED Electronic roulette
The circuit utilizes a 4046 Phase-Locked Loop (PLL) that incorporates a voltage-controlled oscillator (VCO), two phase comparators, a source follower, and a Zener diode to generate a low-frequency pulsed output of approximately 40 Hz. The frequency range of the VCO...
LED Blinker with HT-2014M
A very simple LED flasher circuit. With HT-2014L the circuit produces 1 flash per second and the HT-2014M produces 2 flashes per second.
The LED flasher circuit is designed to provide a visual indication through intermittent illumination of an LED. It...
Stereo Led Vu Meter
This circuit provides a cheap alternative to the LM3915 series LED displays. The meter relies on a square-wave oscillator built around two CMOS analog switches, which alternatively selects the right and left channels for monitoring and display. The selected signal...