Switch Mode Voltage Regulator with 85% efficiency

February 9th, 2012 by psu | No Comments | Filed in Stabilization circuits, Switching Power Supply

SMPS circuit 300x178 Switch Mode Voltage Regulator with 85% efficiency

Switch Mode Power Supplies (SMPS) is now widely used in modern electronic equipment due to its compact design and high efficiency of about 80% or more. The switch-mode regulator circuit presented here has an efficiency of around 85%.

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pinit fg en rect gray 20 Switch Mode Voltage Regulator with 85% efficiency

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Choosing a PC Power Supply by Power Comparison

December 21st, 2011 by psu | No Comments | Filed in PSA Knowledge

best psu 300x264 Choosing a PC Power Supply by Power Comparison

Power supply is probably the most computer components are often overlooked by PCs buyers. However, this component is very important : such as when the power is insufficient or if the voltage is too unstable, the power supply can cause crashes or reboots the machine. Even worse, if power is working too hard and / or in poor quality, maybe just by turning on the computer may cause damage to most of the components: motherboard, CPU, hard drive and a DVD player!  Note that branded manufacturers are also found in the market often overlook the power supply in order to reduce the selling price of the computer. Most buyers assume the power supply is not important, some unscrupulous manufacturers introduce large-sized power and poor quality for their machines.

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pinit fg en rect gray 20 Choosing a PC Power Supply by Power Comparison

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Positive Regulator with PNP Boost

November 14th, 2011 by psu | No Comments | Filed in Stabilization circuits

Positive regulator with pnp boost 300x160 Positive Regulator with PNP Boost

The IC8211 (Programmable Voltage Detectors) provides the voltage reference and regulator amplifier, while Q1 is the series pass transistor. R1 defines the output current of the IC8211, while Cl and C2 provide loop stability and also act to suppress feedthrough of input transients to the  output supply. R2 and R3 determine the output voltage as follows :
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pinit fg en rect gray 20 Positive Regulator with PNP Boost

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Variable Voltage Regulator based LM117

October 29th, 2011 by psu | No Comments | Filed in Stabilization circuits

variable voltage regulator base LM117 300x200 Variable Voltage Regulator based LM117The regulator circuit uses an LM117K three-terminal adjustable output positive voltage regulator in a TO-3 can. The variable voltage regulator lets you adjust the output voltage of a fixed DC power supply between 1.2 and 37 VDC, and will supply the output current in excess of 1.5 A.

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pinit fg en rect gray 20 Variable Voltage Regulator based LM117

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Variable Zener Diode

October 27th, 2011 by psu | No Comments | Filed in Stabilization circuits

variable zener diode 229x300 Variable Zener DiodeThis circuit acts like a zener diode with a wide range of voltages. The current passing via the voltage divider R1-R2 is substantially greater compared to the transistor base current and is in the region of 8 ma.
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pinit fg en rect gray 20 Variable Zener Diode

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