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…
Schematics
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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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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…
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The TDA2003 is a low costamplifier that is designed to run on single rail power supplies up to 40v maximum. The device provides a high output current capability (up to…
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A logic probe using a 555 timer a 74HC00 and some other components Schematic
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