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Recent New Posts


 How to use normal multimeter to measure high AC current.

Tuesday, August 19th, 2014

A general cheap analog multimeters will not have directly AC current ranges.  But we are an Electric Appliance Repair, will always have this problem. For example: Measuring current of the electric appliances. How to modify our meter? We can modify the multimeter on AC 10V range to measure AC current 0-10A,use a 1 ohms resistors […]


 The parts you need.

Sunday, August 17th, 2014

Now that I am older,bad memory. It is slow and may be faulty. Ancient people used to say that when do not remember, so must be noted protect to forgetting. Thus I will write this article to me. but not only me It may be useful to everyone. Switches SPDT- Single-pole, Double-throw


 Logical guessing game circuit

Sunday, August 17th, 2014

This circuit is the logic guessing game circuit use the digital ICs as base of projects. They are used for playing, with 2 players, the first will set logic, and second guessing logic. The code in this circuit is 4 switches. If a player can guess the code exactly as planned, will have the alarm […]


 Low noise pre tone control circuit using NE55532

Thursday, August 14th, 2014

This circuit is a pre tone control using NE5532. In a three circuits of preamp tone controls by NE5532 is a very popular. But it has details are not clear. We recommend the low noise pre tone control circuit instead. We use the a NE5532 is heart of circuit. It was a very interesting Ics […]


 6 ranges AC millivoltmeter circuits

Wednesday, August 13th, 2014

Sometimes, we need to measure very tiny AC voltage and also high frequency. We cannot use a general meter. How it works This circuit can easily measure the very tiny AC voltage and high frequency 100 Hz to 500 Khz. Use an op-amp is the input is mosfet types, so has input impedance about 10 […]



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