Projects in the April 1999 issue of EPE Magazine | |
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Build our Mechanical
Radio! Uses a small d.c. electric motor with a winding handle to charge up a 1 Farad capacitor for its energy source. Simple a.m. radio receiver circuit drives a crystal earpiece. Fun and interesting to build. |
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![]() This PIC-powered project has a multitude of uses as a counter, frequency meter (< 20kHz), and elapsed time in a variety of modes. The highly versatile design can accept audio signals via an electret microphone if desired. Displays elapsed time, total event counts, average rate; counts per second, minute or hour as desired. Liquid crystal display readout, battery operation. Source code available free from the EPE FTP site here. A useful piece of gear with a multitude of uses. ![]() |
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Introducing PIC 16F87x Microcontrollers< |
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MAX761 d.c. to d.c. converter |
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Also in this issue - Circuit Surgery looks at solid state relays and photovoltaic relays; Net Work checks out the UKs latest free ISPs; Ingenuity Unlimited - Readout - New Technology Update. |
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