Free electronic circuit design and schematic diagram
A constant voltage constant current (CVCS) regulator doesn’t mean a system with a constant load, since there will be no regulation in such case. What we call CVCS regulator is a regulator with two modes. The first mode is constant voltage, where the regulator trying to regulate the supply to a variable load at a constant voltage. In this mode […]
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Compromising between the speed while maintaining safe operation for battery charging is an interesting challenge. This circuit can be used to charge a battery , and it’s safe and rapid. To get quickly charged, this circuit charge with initial charging voltage of 2.5V per cell. To keep it safe, this circuit prevent the battery from overcharging by lowering the voltage […]
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Some single supply op-amp circuit might be used in some application, but it rarely has perfect linearity near the zero level since it has very low drive in the feedback path, so negative supply could be the only solution sometimes. Negative supply from positive supply is needed if the circuit need both positive and negative supply while we have only […]
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This linear voltage regulator circuit provides battery voltage regulation from battery source to power micro controller system. The output can be selected by choosing the right resistor value in the feedback path. Many today’s micro controllers are featured with power down or power saving mode, and this circuit accommodates this feature by providing low power mode control on its input. […]
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High voltage applications can be found in various fields, such as ignition in internal combustion engine, gas igniter, cathode ray tube excitation, ionizer for dust odor catcher for air sanitary, ionic propulsion or many other things. The schematic diagram presented here shows a circuit of high voltage generator that can be used for various purposes. This circuit uses a 4049 […]
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For critical operation, the power loss can be unacceptable. It might be costly if a financial data is lost from the memory in the middle of point of sale transaction, or even it can be deadly if some life support devices fails during critical surgery. The schematic diagram presented here is a battery backup regulator circuit, useful for memory or […]
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Ni-Cad (NiCd, NiCad) battery, sometimes doesn’t work as expected, gives no power and cannot be recharged. In this situation, the battery need to be reconditioned. It’ is possible that the battery is internally shorted, and we can get the battery into life again by recondition the Ni-Cad battery using a zapper circuit. This circuit restore the Ni-Cad battery from shorting […]
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