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  1. N

    Microwave frequencies emitter circuit

    Hello, For my project I need to build a variable frequency emitter, with a frequency between 100MHz and 3500Mhz. I saw some simple RF circuits on the Internet but I don't think they can reach such high frequencies. Here is a circuit I've found : I don't need to transfer any information, so...
  2. J

    Capacitance-Inductance meter without instruction manual. How I use it?

    I have bought a capacitance and inductance meter from a 2nd hand shop and there is not manual. So I don't know how to use it. I don't want to damage the device, so I have searched in the net and I have found some information about the mode 6243. My model is 6243+, so I attach some pictures and I...
  3. R

    Toroid selection

    Hello, I have seen numerous Youtube videos on super high voltage Joule Thief projects. They are using small one inch ferrite toroids and from single 1.5 volt AA battery power a 3-5 watt 110-220 volt cree LED brightly consuming merely 200 mA of current from the battery! The following link will...

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