Convert a galvanometer to voltmeter
My son want to make a simple DC voltmeter on 0-10V range by Convert a galvanometer to voltmeter.Galvanometer DC1mA is cheap and easy with one resistor only.
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December 30, 2018
DIY Cheap Resistance Decade Circuit
DIY Cheap Resistance Decade Circuit
Here is a DIY resistance decade tool for testing and calibration. Because it can substitute into a circuit with all standard value. This ideal is cheapest that use resistors and wires only.…
November 13, 2018
Simple big robot toothbrush
Today, My son make a toy for younger sister. It is a Simple big robot toothbrush. The principle is very simple, It vibrates with movement, without direction and control. He…
August 19, 2016
Complementary common-emitter circuit
This complementary common-emitter circuit has special feature that can be applied in 2 model. - Low distortion buffer - The low power output circuit How it works In Figure 1…
December 1, 2014
The logic gate without IC
The past, we've used only a digital logic circuit by IC. But, in truth. We do not need any Ics, may use Switch or Diode or transistors connected as a…
January 30, 2014
Adding voltage rang for old multimeter
It's very easy to use resistors only. Let's practice a little electric calculator, fun!
December 31, 2013
Operation of 200 watt inverter diagram
The working principle has been improved. Learn it more!
June 1, 2013
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