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Very Stable 40kHz Generator - ASCII format-A circuit that I have
used before is based on the CD4060 (14stage binary counter) and a 640Khz
ceramic resonator. The CD4060 is basically an oscillator and a ripple
counter to divide the 640khz down to something more usable.
(electronic circuit added 7/03) |
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Voltage to Frequency Converter + 1us LED Pulse Driver - This
circuit receives the signal from the above amplifier and launches powerful
1uS infrared light pulses from a low cost LED that are frequency modulated
by the audio information. The 10KHz center frequency of the pulse stream
is low enough so a standard infrared LED can emit ten times more light
than conventional long pulse techniques …. [Designed by David A. Johnson] |
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Wireless Alarm - Making yourself an alarm is both useful and
interesting: but the best part is when you take the remote control out of
your pocket, and switch on the alarm while saying .....(added 05/06)
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Wireless Alarm Transmitter and Receiver - Here are two circuits that make it
possible to add up to eight detectors to an existing alarm system without running a
single cable. Each transmitter has a unique number that is reported to the central
unit in the event of an alarm, and the transmitter battery condition is monitored.
….must register on this site.... [Published in Elecktor July/August 2010] |
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Wireless Auto Tachometer (Aaron Cake) - (circuit / schematic design added
08/08/08) |
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Wireless Base Station Evaluation Board Interoperability Guide - National
Semiconductor Application Note (app note added 3/06) |
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Wireless controlled light dimmer - The meaning from this design is to build
it in -i.e. a shaded lamp- and to switch this lamp on and off the normal way, just
like it was switched before the dimmer was build in, then you could by exception
dimming the lamp more or less with your TV remote control. When you switch the power
on there will follow a soft-start till the lamp burns at the previously adjusted dim
level. With the '0' button in TV mode you can dim the lamp, turn more and less bright.
The remote control should send more then one RC5-signal per button-press seeing that
the first one is ignored, this does imply that when the remote button is pressed a
short time, there nothing happens. With the P+ and P- button from a system at choice
you can adjust the maximum and minimum dim-levels and with the '1' button the start-up
brightness. ….(electronic schematic added 11/08) |
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Wireless devices? low power energizes battery - 11/22/07 EDN-Design
Ideas.....A simple 13.56-MHz oscillator broadcasts power to a receiver circuit.....
EDN is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Wireless Doorbell - The transmitter circuit is made up of two building
blocks, the 303MHz RF oscillator and the 32kHz crystal controlled oscillator. The
303MHz oscillator consists of a self-oscillating circuit made up of the coil….(diagram
added 05/07) |
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Wireless Electrocardiogram Monitor - (diagram added 05/07) |
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wireless for the bench top ATtiny12 - This section describes an
experimental low power, low bandwidth data signaling system that was initially made to
operate at 55 MHz (television channel 2 in the U.S.). Before operating a radio
transmitter, find out what kind of transmitter operation, if any, is permitted in your
locality. Radio transmitter operation is a serious legal matter. This
design..... |
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Wireless Home Security Implementing Keeloq® & the Picmicro® MicroController -
Microchip Application Note Published 12-Oct-99 (app note added 2/06)
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Wireless IR receiver - Schematic only, no circuit description |
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Wireless Keyboard - (application / block diagram added 6/07) |
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Wireless Liquid Level Sensing for Restaurant Applications - (circuit /
schematic design added 6/06) |
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Wireless Local Network for Palmpilot Large PDF - (circuit / schematic design
added 6/06) |
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Wireless Microphone - Circuit & notes only, no circuit description given….
[Tony van Roon's circuit] |
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Wireless Monitoring System - Circuit Cellar June 2004, Issue 167 --
One of the things I have learned from my everyday engineering practice is that there
is always room for ingenuity and improvement. This is particularly true for this
project, which applies a couple of inexpensive microcontrollers to an unusual device:
a live-catch mousetrap. |
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Wireless Phono Oscillator - A "phono oscillator" is a simple, short-range AM
band transmitter that was typically used to send the signal from a phonograph to a
nearby radio, eliminating the need for an amplifier and speaker. This version
uses only one transistor and.....(electronic design added 6/07) |
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Wireless Radio Data Link - This is a description of a very simple unit
designed and constructed for use as a wireless data connection between two nearby
computers. The error rate is excellent over short runs, and the transmission speed
means that a useful PPP link.....(added 6/06) |
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Wireless RF PWM Dual Motor Controller - (circuit / schematic design added
6/06) |
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Wireless Telephone Eavesdropper Electronic Circuit - The IR transmitter
connects to a telephone circuit, and transmits both sides of all telephone
conversations to any line-of-sight location, within 40 feet. No power is taken from
the central office, as long as all phones remain on-hook. The current flows through
the phone and back to the central office.....(electronic design added 6/07)
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Wireless Temperature & Humidity Sensor with USB - this project is based on
obdev's RemoteSensor example and their firmware-only USB implementation; the main
change is the replacement of the analog sensors with a Sensirion SHT11 digital
temperature and humidity sensor…(added 07/07/07) |
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Wireless Temperature & Humidity Sensor with USB Interface - This project is
based on obdev's RemoteSensor example and their firmware-only USB implementation; the
main change is the replacement of the analog sensors with a Sensirion SHT11 digital
temperature and humidity sensor. ….(electronic schematic added 11/08) |
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