Free electronic circuit design and schematic diagram
This is video about how to pretune a ham radio antenna. This video shows how to tune a ham radio. In this video, the antenna is tuned to make sure that the radio can have optimum performance. So the radio can get contacts from the ham radio. First, the lower frequency is tuned. Then tune the top band of the […]
Read moreThis is how to use a SWR meter video tutorial. This video describes about how to use SWR meter. The SWR meter has 3 switch, they are range switch, function switch, and mode switch. Beside that, the SWR meter also has calibration that is used to calibrate the SWR meter. How to calibrate the SWR meter is shown in this […]
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The circuit diagram below shows us about a form of PID controller. The input signal is buffered and amplified by a non-inverting amplifier and the gain of this stage defines the proportional gain P of the controller.The amplified error signal passes in parallel through an integrator (top) a unity-gain amplifier (middle) and a differentiator (bottom) all of which have inverting […]
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Based on the squaring property of two back-to-back diodes connected across output and inverting input of the op-amp, IC1B forms a rather straightforward fuzz circuit. The squared output signal coming from IC1B is converted into a triangle-shaped waveform by IC1C and related components. IC1D is wired as a virtual-earth mixer, summing the linear, squared and triangle-shaped signals coming from IC1A, […]
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This is a Water Level Indicator with alarm circuit. This circuit is used to indicate the amount of water present in the overhead tank. Not only that, but this circuit also gives an alarm when the tank is full. CD4066 is used to indicate the level of the water through LEDs. Here is the schematic diagram of the circuit: The […]
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This circuit diagram shows us about simple SWR which is built using readily available parts. Take a note that to ensure accurate power reading, no attempt has been made . If we want a circuit that would fit in a small enclosure, and give an indication of minimum SWR, this circuit does the trick. The trick is based on the […]
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This is Thevenin equivalent tutorial video part 4. This video shows how to calculate Thevenin equivalent with control source and an independent source using current loop. In this video, to calculate the Thevenin voltage Ref and V1 are used. First, the circuit is tested using open circuit test to obtain Voc. Then, to obtain Isc, the circuit is tested in […]
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