Another sparkfun design here for a simple board that takes a 4-9V input voltage and outputs a selectable 1.8V or 3.3V regulated voltage. Based on the LM317 again Bill…
Author
iainhendry
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An open source power supply based on the LM317, the voltages are switchable using SW2 Parts List Part Value Device Package Description C1 100uF CAP_POLPTH1 CPOL-RADIAL-100UF-25V Capacitor Polarized C2 10uF…
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the Freeduino MaxSerial, designed by Fundamental Logic Derived under CC2.5 from the Freeduino files above and the Arduino Diecimila schematic Download Eagle files for the schematic and the board …
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the Freeduino Serial, designed by NKC Electronics Derived under CC2.5 from the Freeduino files above and the Arduino Serial 2.0 schematic Download Eagle files for the schematic and the board…
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by Tony van Roon Use this circuit instead of a standard on-off switch. Switching is very gentle. Connect unused input pins to an appropriate logic level. Unused output pins *MUST*…
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As shown in the schematic above, when a inductor coil L1 is brought near the wire carrying the audio signal, the audio signal will be induced into the coil and…