EPE Moodloop Power Supply
Approx construction cost US$35
A regulated 13.2V 1A supply which may be modified for 12V output.
This power supply was designed to give a constant voltage output with sufficient current for the EPE Moodloop project described in last month’s issue. The Moodloop may be operated from a supply anywhere between 9V and 15V, the only restriction being that the voltage of the supply should not vary. Although the average supply current drawn at 12V is about 600mA, the peak value is closer to 1A and at 15V it will be even higher. Since the output frequency range of the Moodloop extends down to 1Hz, the use of large decoupling capacitors to supply these current peaks is impracticable. Instead, a power supply capable of delivering the peak current continuously is required.
In some cases a suitable regulated supply may already be available, but for Moodloop constructors without access to a suitable power source this project will fill the need. It is compact, simple and relatively inexpensive to construct and can also double as a useful source of DC power in the work-shop for other applications.
More details on this construction project can be found in the September 2000 issue of EPE Online, the world's first web-delivered electronics and computing hobbyist magazine.
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