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Search results: 122   Output: 61-70
  1. Ron J The IC is a quad 2 input AND gate, a CMOS 4081. These gates only produce a HIGH output, when BOTH the inputs are HIGH. When the key wired to 'E' is pressed, current through R1 and D1 switchs Q5 on.The relay energises; and Q5 is 'latched on' ...
  2. I vica N ovakovic Here is a solution for you The Ir LightDimmer is simple to use, you only need two keys of your remote controller, which are not often used (like teletext keys or similar) or which are not used at all and one push-button that you ...
  3. Devices known as electrical key-lock can de found in many versions, but I will demonstrate you another interesting workaround of that device. Specificity of that device is a new way to read more keys using only one input of microcontroller. As you ...
  4. Notes: This tester is designed to locate stray electromagnetic (EM) fields. It will easily detect both audio and RF signals up to frequencies of around 100 kHz. Note, however that this circuit is NOT a metal detector, but will detect metal wiring ...
  5. I had an incredibly fun time putting this particular project together, and I hope you do too. This project shows how to build a talking clock with time temperature display + it includes several handy C functions you may find useful for other ...
  6. While I'm usually busy with larger projects, sometimes I get fed up with them and get the need to just tinker a bit with a small project which will take at most half a day or something. This is one of them. For a long time, I had the idea that a ...
  7. Andy Collinson anc[ a ] Description: A single chip metal detecor with a range of a few inches. This is useful for decting nails or screws in walls and floors, or for locating buried mains cable. Notes: The heart of the circuit ...
  8. Tom XxTomxx14[ a ] The circuit uses a 555 timer wired as an astable oscillator and powered by the emitter current of the BC109C. Under dry conditions, the transistor will have no bias current and be fully off. As the probes get wet, a small ...
  9. Andy Collinson anc[ a ] Description This circuit is used to relay signals from an Infra Red remote control in one room to an IR controlled appliance in another room. Forward I have seen these devices advertised in magazines, ...
  10. Step 1 Using a few LEDs and really cheap fiber optics, I made this dead sexy illuminated fiber optic rose and I’ll show you exactly how it’s done. Step 2 Wires, solder, and soldering gun (of course) 1 green led (I used 6000mcd) Found ...

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