Search results

  1. E

    Increase dc voltage

    I need to increase the voltage in the motion alarm circuit im working on. Im puting roughly 12vdc into the PIR sensor, but it only puts out 3.3vdc. The problem is that the voltage leaving the sensor is going to a 12v coil relay....ive explored the idea of a transistor or MOSFET. Are there any...
  2. E

    A couple questions

    I feel like im on here all the time haha. Im learning to "walk before i run" so i had an idea for a small project. A motion alarm system. Triggered by someone entering a room. I think a PIR sensor would work. Heres my question...i want the alarm to be a speaker but more like an alarm clock tone...
  3. E

    "Variable Voltage Battery charger"

    Ok ive drawn up this this schematic to the best of my knowledge. Its taken a couple days of research and im ready for you guys to completely tear it apart haha. Listen im not an expert. But i want to learn so i hope to only(mostly) get educational criticism. Im not starting the build until im...
  4. E

    Looking for a specific transformer

    Hey guys. Im looking for a specific transformer for a project im dreaming up. Input: 120vac Output: 15vac I cant seem to find it. If my math is right it would need to have a power rating of 2kW. Since V×I=P (120×15=1800). Correct me if im wrong. If anyone is really interested i can post a...
  5. E

    Experimental Repair

    Okay so the title is a little misleading. Im not very optimistic this repair will succeed but with a new solder gun on order i figure id learn something. Its a 260/200 watt Weller solder gun. It quit working, so i replaced the two stage trigger with a SPST toggle switch. This didnt work. After...
  6. E

    Where to Buy/Sell/Trade

    Hey guys, So im fairly new to electronics but im learning very fast. Ive started to buy broken electronics off ebay, fix them and sell them to make a couple dollars on the side. I was wondering who else on here does this and where do you do your business? Also is there a good place to buy...
View older results
Top