how to build homemade led tube light
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light activated led scr
The schematic presented is a circuit for a light-activated LED utilizing an SCR (Silicon Controlled Rectifier). SCRs, which resemble transistors in appearance, operate on different principles compared to transistors. In this circuit, the SCR functions as a switching device. When...
fading red eyes
This circuit is designed to gradually illuminate and fade a pair of red LEDs (light-emitting diodes). The fading LEDs can be used as 'eyes' in a small pumpkin or skull for Halloween decorations, or as part of a Christmas tree...
Flashing-LED Battery-Status Indicator Circuit
A battery-status indicator circuit is useful for monitoring portable test equipment and similar devices. LED D1 flashes to attract the user's attention, signaling that the circuit is operational, preventing it from being left on unintentionally. The circuit produces approximately two...
1.5 Volt LED Flasher Circuits
The LED flasher circuits below operate on a single 1.5 volt battery. The circuit on the upper right uses the popular LM3909 LED flasher IC and requires only a timing capacitor and LED. The top left circuit, designed by Andre...
led vu meter circuit using lm3915 ic
This LED VU Meter (volume unit) is designed to monitor and display power levels present at the speaker terminals of a stereo audio power amplifier. The levels are represented in ten discrete steps using ten LEDs for each channel, providing...
Six LED Stereo VU Display
The following circuit is a six LED stereo VU display diagram that is constructed using the Dot/Bar Display Driver IC LM3915. This VU display should be connected before the amplifier module circuit. It can be connected at the pre-amp output,...
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...
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...
Led Expanded Scale Voltmeter Circuit
A10-V zener diode is utilized to extend the measurement range of a voltmeter from 0-5 V to a range of 10-15 V. An LED bar graph illuminates one segment for every 0.5 V increase above 10 V. Additionally, the 7805...