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One of the most useful pieces of test equipment for the workshop is a variable output supply for in testing and setting up new circuits. Such a system was developed to meet the following conditions. Firstly the power supply should cover a wide range, 0 to 50 or 60 V, and to avoid the need for a built-in voltmeter it should be possible to dial up any required voltage. Secondly, the output would have switchable current limiting, and a high maximum current - 1 A. The current limiting should protect the circuit the power supply is feeding - in this case the power supply switches to standby after excess current. Thirdly, it should be as difficult as possible to get an excess voltage on the power supply output. The fourth requirement is that the power supply should be unharmed by misuse and protected against overheating.