Free electronic circuit design and schematic diagram
This is a video tutorial about Differences in Wire Gauges. This video describes The Differences in Wire Gauges: the bigger the number of gauges, the smaller the wire. For example house wiring that it has 14 gauge or 12 gauge because the house wiring doesn’t require flexibility. For speaker wiring, it has 22 gauge, because it need flexibility. Here is […]
Read moreThis is a tinning soldering iron video tutorial. This video shows how to tin a soldering iron. Tinning is when we take solder and flow it on the tip of the soldering iron. we also have tin components and wires, which will be shown in the video. The soldering iron is getting hot for first time and tin it, so […]
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This is Electronic Ballast for CFL (Compact Fluorescent Lamp) circuit using IR2156. The IR2156 contains a high voltage half-bridge gate driver with a state diagram and programmable oscillator to make a full ballast control IC. The feature of IR2156 are programmable preheat time, programmable preheat and run frequencies, programmable over-current protection and programmable dead-time. Protection from filament failures, failure of […]
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This is an Automatic Cooling Fan Controller circuit. This circuit is very useful during summer to keep our important item and rigs such as VHF and UHF transceivers staying cool. Because VHF and UHF transceivers were sold with no cooling fans and oversized heat sinks. Here is the circuit: This circuit uses The thermistor, R1. It is the heart of […]
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There are many low power SSB rigs and kits don’t have any real speech processor circuitry, although there is a built in speech processor in most modern HF. Speech processing is an important thing, when the SSB is operated at low power to get through the QRM. Speech processing can be done by this circuit. This is a simple and […]
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The AGC is used in many system especially communications. This AGC works at 50Mhz, and the output voltage is set by a digital signal that is needed by Self-calibrating systems such as automatic test equipment which requires the high frequency response. During calibration, the AGC output voltage will be calculated by test equipment to get accuracy requirements. The AGC output […]
Read moreThis is a transistor video tutorial. This video describes about transistor and how it works. Transistor can be used as amplifier or switch. There are many kinds of transistor, in this video bi-polar transistor is described. There are two kinds of bi-polar transistor, NPN and PNP. Bi-polar transistor has three layer, they are input layer, control layer and output layer. […]
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