Free electronic circuit design and schematic diagram
ESR is Equivalent Series Resistance. ESR is one of the characteristics that defines the performance of an electrolytic capacitor. It’s highly desirable to use Low ESR in capacitor as any ripple current through the capacitor causes the capacitor to heat up due to the resistive loses. By drying out the electrolyte at an ever increasing rate, the heating accelerates the […]
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This circuit presents a very simple and useful stereo balance indicator circuit that is based on few common external components. This schematic circuit is very simple to build. An visual indication with LEDs for left , right and center balance is provided by this circuit. Outputs from each channel are fed to the two inputs of IC1 connected as a […]
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The ESR (Equivalent Series Resistance) of an electrolytic capacitor is normally just a low voltage capacitor (such as a 1000uF, 16V cap), small fraction of an Ohm for a high capacitance, and can be as high as two or three Ohm for a low capacitance, high voltage cap (1uF,450V). This resistance increases when the capacitor ages, and it often does […]
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This is a circuit of Wideband SWR Meter. This circuit is used as a test instrument. To use this circuit, connect the meter, take the necessary readings, then disconnect. The meter should not be left in the line permanently because it draws up 3/4 of the transmitted power, and a similar part of a received signal. This circuit uses Three […]
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This is a simple circuit of Touch switch activated relay. This circuit is used to turn on/off electronic relay using touch sensor. This circuit consist of two main parts, they are a decimal counter and an current amplifier circuit. This circuit is need a 5volts power supply. Here is the circuit: As the counter circuit, this circuit uses JK flip […]
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This is a 1.5 to 9 volts inverter schematic circuit. This is low cost and a simple circuit that need few components.This circuit is used in many application that requires 9 volts power supply. using this circuit we can replace the expensive 9v batteries. This circuit can convert 1.5V to 9V. This circuit can be used only for application that […]
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Resistor and LM317L act as a current regulator set to 40 ma. Current will flow from the battery through one pair of LEDs, and then to the regulator, through the other pair of LEDs and finally back to the battery. Noise on the power supply lines filtered out by the capacitor. To make the current through them is roughly equivalent, […]
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