How to use resistor Reduce Voltage for LED more load
How to reduce voltage for LED and others loads. We use a limiting current resistor reduce current or voltage in a series circuit. So easy to do
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December 30, 2018
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.
December 30, 2018
Speaker protection circuit
It will prevent the speaker from too over high power output may speaker damaged it use transistor and relay cut off as safe.
December 28, 2018
Simple delay on speaker
If you are building a normally OCL power amplifier. You will hear sound "tlub.." on your speaker. That is not good for your expensive speaker. Also, You also feel annoyed…
December 27, 2018
DC Power supply 0 30v 5A, Adjustable regulator
This is DC Power supply 0 30v 5A,Adjustable regulator, output 5A. It use LM723 DC voltage regulator IC + 2N3055 power transistor x2 to increase current up.
December 24, 2018
