Bluish Flasher
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230V Blinking LED
A pulsating light is used for signaling purposes with a voltage of 230V. A simple circuit has been designed, consisting of an LED diode, two capacitors, two resistors, a diac, and a diode. The operation of the circuit is straightforward....
Metal detector circuit diagram 1
The metal detector circuit includes a fixed frequency oscillator, mixer, detector, detection oscillator, and power amplifier circuit. The fixed frequency oscillator circuit is composed of a ceramic filter (ZC), transistor (V1), resistors (R1 to R4), capacitor (C2), and other components....
speak memory
Mike Licht confesses to the transistor-related misadventures of his youth. The pocket transistor radio is considered essential to mid-20th century American pop music, but its significance extends beyond music itself; it played a vital role in shaping conversations and thoughts...
Nite Rider LEDS
As a keen cyclist I am always looking for ways to be seen at night. I wanted something that was a novelty and would catch the motorists eye. So looking around at my fellow cyclists rear lights, I came up...
LED Color Fade Effect circuit diagram
This circuit creates an LED color fade effect. As indicated by the name, the light intensity of the LEDs in this circuit transitions from high intensity to low intensity and eventually turns off. A 30 µF capacitor and a 100...
Audio operated relay
Q1 and Q2 are general-purpose transistors. The 10 kΩ input potentiometer is adjusted to a point just short of where Q1 turns on, as indicated by relay K engaging. K is any 5 V reed relay. With the specified values...
LED Flasher III
This circuit will flash a super-bright LED (5000+ mcd). Good for fake car alarm or other attention-getting device. Component values are not critical; try anything else first from your junk box. Obviously, the 470 ohm resistor (R3) determines the LED's...
led workbench lighting
A highly practical workbench lighting unit designed for electronics hobbyists. The portable inspection lamp circuit features an onboard voltage regulator and a high-brightness 5mm white LED. It can be powered by any 9 to 18 volt DC-rated AC mains adapter...
LED operates as light sensor
A simple 741 amplifier is utilized as a current-to-voltage converter, with an LED serving as the current source. The output voltage is proportional to the incident light. The junction is biased solely by the difference between the output summing node...