DIY Variable Power Supply 0-30 V 0-3 A |

How To Make A Variable Power Supply 0-30 V 0-3 A | DIY Variable Power Supply
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A bench power supply usually refers to a power supply capable of supplying a variety of output voltages useful for BE (bench testing) electronic circuits, possibly with continuous variation of the output voltage, or just some pre-set voltages. Some have multiple selectable ranges of current/voltage limits which tend to be anti-proportional.

A laboratory ("lab") power supply normally implies an accurate bench power supply, while a balanced or tracking power supply refers to twin supplies for use when a circuit requires both positive and negative supply rails).

Variable bench power supplies exist both as linear (transformer first) and switched-mode power supply (full-bridge rectifier first), each with a different set of benefits and disadvantages:

The former type produces only very little noise (or "ripple voltage") and is less prone to external electromagnetic and radio frequency interference (EMI, RFI), making it preferable for audio equipment and radio-related applications and for powering delicate circuitry. Linear power supplies also have fewer fail able parts which increases longevity[a], and have a quicker transient response, whereas switching-mode power supplies are more lightweight, efficient, and more compact at a similar power rating, making them suitable for high-power applications. The higher efficiency means less heat production at the same output power, thus less wasted energy and needed cooling. Additionally, they may be able to operate on a wider MAINS input voltage range, typically around 110 to 240 volts rather than a section of approximately twenty volts on only end of the range, to be able to operate internationally. Similar switching technology is used in AC adapters that charge battery-powered devices including mobile phones, laptop computers, and electric bicycles. Linear variable bench power supplies have existed since longer ago, dating back at least to the 1980s

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