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    150 x Power Supplies

    Browse through a total of 150 power supply circuits. Great collection of power supply and PSU projects: battery chargers, regulators, solar power supplies.

    DC to DC converters   battery chargers   battery indicators   battery monitors   variable power supplies   voltage and power inverters   voltage converters   voltage regulators  

    3.7V Li-Ion Battery Charger Circuit Here is a tried and tested sample circuit of a Li-Ion battery charger that can be used to charge any 3.7V Li-Ion battery using a 5VDC (USB, Solar Panel…) power supply. At the heart of the circuit is one microchip MCP73831, available in SOT-23-5 package. MCP73831 is a highly advanced linear charge management controller...
    Synchronous MOSFET Rectifier for Reverse Battery Protection When powering a battery operated circuit, the experimenter must make a decision: either take his chances (Murphy loves this one), or opt to add protection in the form of a simple series diode. Unfortunately, as the voltages keep get lower and lower (e.g. 1.2V), a series diode ceases to be a valid option. The solution of choice...
    High Power Car Voltage Regulator While traveling recently, my family had trouble powering the 5 smartphones, 2 tablets, and 2 laptops while driving 2500mi through the southwest. Route 66 and the Grand Canyon are pretty, but in between there are whole lot of straight highways that are not as scenic. This regulator, with the addition of some USB connectors...
    Battery Discharge Cut-off Control This circuit prevents over-discharge of a lead-acid battery by opening a relay contact when the voltage drops to a predetermined voltage (lower voltage threshold). When the battery is recharged to a second predetermined higher voltage (upper voltage threshold), the relay contact automatically re-closes and power again flows to...
    Secure Power Switch Circuit Most of the diagnostic, treatment, and life support devices used in healthcare require regular power supply in order to function properly. Accidentally turning off a medical device can have serious consequences. How can you prevent an accidental or unexpected equipment shutdown? Here is a little circuit to prevent such costly...
    Current-limited Alternator Battery Charger Control A common problem exists when driving automotive alternators via motors. In the process of attempting to regulate the charging voltage of a low battery, the alternator shaft torque usually exceeds the motor capability so that is likely to stall and /or overheat. The solution is to regulate (limit) the charging current because...
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