Tip & How-To about Electrical Supplies

Choosing a suitable AC-DC power pack

Power-packs, aka AC-DC converters or wall warts step mains AC voltage down to a lower voltage, then rectify this to direct current (DC), regulate and smooth the output voltage level and ripple. Some supplies have an optional output voltage selector to match the device being fed. Unless your device is under a warranty clause that disallows usage of a non-OEM supply, a faulty power-pack can often be replaced with a suitable generic equivalent.
[1] Mains input must match your country
[2] Ensure output voltage is DC (for DC appliance)
[3] Voltage output must match appliance (eg 12V DC)
[4] PSU Amperage should match appliance rating
(never use a PSU A that is too 'light').
PSU should also not be overly high, as voltage may not drop enough to correct level when loaded.
[5] Polarity (+) and (-) must be correct (see *).
[6] For electronic / digital devices, use a good quality PSU (Power Supply Unit) ie Wall Wart..
[7] When used continuously or for long periods, the enclosed "brick" type power pack may get quite hot.
Allow enough ventilation around the pack so that the casing can be air-cooled, and add a miniature computer fan (separately supplied) if necessary, to blow air over the casing.
The attached image shows a detailed explanation.

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