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PC Power Switch - Simplest ever PC switching unit, turn on peripherals with the PC. . .
[Rod Elliott (ESP)]
PCB layout considerations for non-isolated switching power supplies - 07/20/12 EDN Design Idea The best news when you power up a prototype
supply board for the very first time is when it not only works, but also runs quiet and cool. Unfortunately, this
does not always happen. A common problem of switching power supplies is "unstable" switching wav. . . [by Henry
J. Zhang, Applications Engineering Manager, Power Products, Linear Technology Corp.]
PCB layout considerations for non-isolated switching power supplies - 07/20/12 EDN Design Idea The best news when you power up a prototype
supply board for the very first time is when it not only works, but also runs quiet and cool. Unfortunately, this
does not always happen. A common problem of switching power supplies is "unstable" switching wav. . . [by Henry
J. Zhang, Applications Engineering Manager, Power Products, Linear Technology Corp.]
PCMCIA Socket Voltage Switching Design Note 93 - DN93 Design Notes (Linear Technology). . . [Linear Technology]
Perimeter Monitor - Using a single cable such as speaker wire or doorbell cable, this circuit
can be remotely positioned, for example, at the bottom of a garden or garage, and used to detect all sound in
that area. The cable can be buried in a hosepipe or duct and is concealed out of sight. The mic is an ordinary
dynamic mic insert. . . [Circuit design by Andy Collison]
Photovoltaic switch disables unused LEDs - 03/18/04 EDN Design Idea In many applications, it's desirable to
disable LEDs used for system verification. Many options are available for the disabling function, including
manual SPST (single-pole single-throw] switches, enhancement- and depletion-mode MOS. . . [by Lance McBride,
Monterey Bay Aquarium Research Institute, Moss Landing, CA]
Piezoelectric
Device used for Motion Alarm - An
inexpensive piezo wafer is used to detect vibration and when the vibration is sufficient a switch is activated .
. . [Hobby Circuit designed by David Johnson P.E., 07/09/06]
Piezoelectric Tap Switch - This circuit uses a flat piezo wafer, glued inside a plastic box, as a
finger tap sensor. With each tap of a finger to the box holding the wafer, the circuit turns on and off AC or DC
power to an external device. The circuit is powered by a 9v battery . . . [Circuit by David A. Johnson P.E.,
12/07/10]
Piezoelectric Triggered
Switch - Two different switch
circuits are shown. One sources current and the second sinks current. Both switches are connected to a piezo
wafer. When the wafer is tapped, the switches are activated . . . [Circuit by David A. Johnson P.E., 02/11/02]
Piezoelectric Vibration
Sensor Activates Switch - An
inexpensive piezo device is used as a motion sensing device for this motion alarm . . . [Circuit by David Johnson
P.E., 07/09/06]
Pine Racecar Victory Judge - . . . [Circuit designed by Aaron Cake]
PINs & GaAs MESFET Switches-Effects On Linearity - MicroNote 703. . . [Microsemi Corp]
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