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Search results: 136   Output: 41-50
  1. Keep LEDs lit when AC voltage drops. TA Babu, India LEDs need power when rectified ac-mains voltage drops during its cycle. The circuit in Figure 1 lets you use an inductor-less, switching, offline power supply as an LED driver for emergency-exit ...
  2. PROBLEM: Even when both ceiling lights are on in the kitchen, the sink has always been too dark at night. Anyone standing at the sink creates a shadow from the ceiling light, making it tough to properly wash dishes or vegetables. SOLUTION: Install ...
  3. This circuit is a simple ultraviolate light that can be powered by a 6 volt battery or power supply that is capable of supplying 1 or more amps. Circuit diagram Parts C1 0.0047uf Mono Capacitor C2 0.1uf Disc Capacitor D1,D2 1N4007 Diode FTB ...
  4. Magirescu Iulian Introduction In the first place, a relay is like a switch to a coil assembly. This switch is activated when electricity is applied to the coil. With a common relay, the electricity must be continuously applied to the coil to ...
  5. This is a easy to build LED lamp circuit for Learning and building skills. This is the first draft schematic V 1.0. It will need improvements for Higher Power Lighting. Click to enlarge I will give a short summary, The LM317 here configured for ...
  6. Marián Štofka, Bratislava By varying the current through red and green LEDs, you can vary the hue in 32 steps. The circuit in Figure 1, which lets you create light of 32 of hues, uses red and green LEDs. A constant current divides ...
  7. Toon Beerten Introduction In this page we will introduce a great project designed by Toon Beerten. His project named DIY Led Mood Lamp can become a very interesting add-on for your room that's absolutely sure it will impress everyone. As you can ...
  8. Introduction A pulse width modulator (PWM) is a device that may be used as an efficient light dimmer or DC motor speed controller. The circuit described here is for a general purpose device that can control DC devices which draw up to a few amps of ...
  9. Introduction DC powered LED lighting circuits can vary from trivial single LED/series resistor combos to simple analog current regulators to more complicated switching power supply circuits such as this project. There is a tradeoff between ...
  10. Forrest Cook Introduction This circuit is for a solar powered white LED with automatic activation in the dark. It can be used for both indoor and outdoor night light applications. For indoor uses, if the circuit is operated near another lamp, it ...

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