This is a benchtop power supply I made from a landscape lighting transformer. It has a bridge rectifier, a large heat sink, and 2 linear voltage regulators. One is for the 9-volt output and one is for the 5-volt output. It has 2 incandescent light bulbs wired in series to reduce current draw. It has a max total DC output of 3.5 Amps. It has max output of 1 amp per regulated rail. All the power consumed by the voltage regulators goes through the heat sink so that I only have to run 2 wires to each.
This is useful for testing circuits, such as 5-5-5 timer circuits. The 5-volt rail is good for testing circuits that normally use a 9-volt battery so that the components aren't damaged by excessive current. I can charge 9-volt batteries through the 9-volt rail. I use another incandescent light bulb when charging the 9 volt battery to limit the current and indicate when the battery is full.
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9 volt regulator
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| 5 volt regulator |
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| bridge rectifier |
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