Free electronic circuit design and schematic diagram
This 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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It is still possible to build circuits without IC’s and still achieve a high level of performance while integrated circuits have become a staple of all modern circuit designs. A high performance 5 volt voltage regulator built using discrete components that are readily available is shown on circuit diagram below. This circuit not need an IC and only need to […]
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They were missing a VOX if we are take a look at some of the budget priced HF transceiver. It would certainly be nice to have VOX capability although most of these budget priced transceivers performed admirably. The figure below show us a basic VOX circuit which will perform very well once the VOX level is set correctly. This is […]
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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 […]
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