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 […]
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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
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 […]
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 […]
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 […]