HP calculator power supplies
#HP calculator
#power supply
#voltage regulator
#battery charger
#electronics
#DIY
#calculator
#DC power
#circuit design
#energy
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Switching Regulator Circuit
This example presents a switch DC regulated power supply circuit designed for buck-mode +5V applications. It consists of a power supply circuit, an impulsator, a voltage sampling or pulse width modulation circuit, and a buffering driver circuit, as illustrated in...
car battery charger schematics
The circuit is designed to be powered directly by a power supply, which is why it does not include a transformer, rectifier, or filter capacitors in the schematic. However, the addition of these components is possible. To operate the circuit,...
Output sampling winding isolated switching power supply
The diagram illustrates the output sampling winding of an isolated switching power supply. In the diagram, T represents a high-frequency transformer; N2 denotes the self-oscillation positive feedback winding; N3 is the error amplifier; VTS is the winding that provides the...
Power supply +20V/15A and +12V/3A
The circuit is based on application of National Semiconductor. First is constituted by three voltage regulators LM338 [IC1-2-3] connected in parallel. The each one regulator has the possibility of giving 5 A in his output. Also exists the possibility to...
Logic PSU with Overvoltage Protection
The 5 volt regulated power supply for TTL and 74LS series integrated circuits has to be very precise and tolerant of voltage transients. These ICs are easily damaged by short voltage spikes. A fuse will blow when its current rating...
Output sampling winding isolated switching power supply
The diagram illustrates the output sampling winding of an isolated switching power supply. In the diagram, T represents a high-frequency transformer; N2 denotes the self-oscillation positive feedback winding; N3 is the error amplifier; VTS is the winding that provides the...
Changhong DVB-2000 digital satellite receiver switching power supply circuit
The Changhong DVB-2000 digital satellite receiver features a switching power supply circuit. This circuit primarily comprises a power input section, an oscillation switching circuit, and a DC output section. The power input circuit receives 22V AC from a step-down transformer,...
Voltage Regulator Calculation
Before designing an adjustable voltage regulator into a circuit or performing a redesign, it is essential to calculate the values for two resistors. While this calculation is straightforward, locating the appropriate resistors may present challenges. Fortunately, a technique exists to...
Structural analysis of switching power supply
A daily switching power supply primarily provides direct current (DC) power to electronic devices. The required DC voltage for electronic devices typically ranges from several volts to over ten volts, while the input voltage from the mains supply is either...