Friday, October 31, 2008
Video Switcher
Remote two wire positioner
Direction sensing motion detector
Detects motion and indicates the direction that a human or animal is moving
Wednesday, October 15, 2008
fm transmitter
parts
Notes
L1 and L2 are 5 turns of 28 AWG enamel coated magnet wire wound with a inside diameter of about 4mm. The inside of a ballpoint pen works well (the plastic tube that holds the ink). Remove the form after winding then install the coil on the circuit board, being careful not to bend it.
C5 is used for tuning. This transmitter operates on the normal broadcast frequencies (88-108MHz).
Q1 and Q2 can also be 2N3904 or something similar.
You can use 1/4 W resistors mounted vertically instead of 1/8 W resistors.
You may want to bypass the battery with a .01uf capacitor.
An antenna may not be required for operation.
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fm transmitter
Saturday, July 12, 2008
Electronic Schematic Links
Sunday, July 6, 2008
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