Testing Linearity of the LTC2400 24-Bit No Latency Delta SigmaTM A/D Converter Help from the Nineteenth Century - Design Solutions 11 Design Notes__ Linear Technology/Analog Devices
The F.E.D. Detects digital RF signals - The F.E.D. (Frequency Emissions Detector) will, of course, detect anyone's cell phone, so the detector really responds to just about anybody with more than two pennies to rub together. Most phones occasionally transmit short bursts to the nearest cell tower, even when the phone isn't in use, so a typical 21st century loiterer will eventually set off the detector. On the other hand, a deer can stare at it for an hour with no effect. Let's face it, even most burglars emit digital signals these days. So, in a sense, the F. E. D. is a human detector. With that in mind, consider using the output to activate a digital camera or video recorder to capture a record of the prowlers. A recorded barking dog or, one of my favorites, a recording of police radio traffic will scare off most crooks. Add some hidden flashing red and blue lights to the police chatter and the culprits will actually run away. __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Touch CPO - touch operated code practice oscillator using popular timer IC 555. Practice Morse code in a different way__
Two Diode Odd-Order Multiplier - it is often necessary to multiply the frequency of low noise oscillators without significantly degrading the phase noise beyond the theoretical 20 log (N). Low noise frequency doublers constructed with Schottky signal diodes are readily available but higher-order multipliers often __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Two-Watt Switching Power Supply - in this small switching power supply, a Schmitt trigger oscillator is used to drive a switching transistor that supplies current to a small inductor. Energy is stored in the inductor while the transistor is on, and released into the load circuit when the transistor switches off. The output voltage is dependent on the load resistance and is limited by a zener diode that stops the oscillator when the voltage reaches about 14 volts. Higher or lower voltages can be obtained by adjusting the voltage divider that feeds the zener diode. The efficiency is about 80% using a high Q inductor. __ Designed by Bill Bowden
Unusual Frequency Dividers - This paper is a collection of unusual frequency divider techniques which offer features not achieved with ordinary divider ICs or prescalers __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Using the ESG-D RF Signal Generator's Multicarrier, Multichannel CDMA Personality for Component Test, Option UN5 - Application Note__ Aligent
Using Vector Modulation Analysis in the Integration, troubleshooting & Design of Digital RF Communications Systems - Application Note__ Aligent
Wideband RF ICs for Power Detection & Control - DN335 Design Notes__ Linear Technology/Analog Devices
Wireless Communications with the BASIC Stamp - This article shows how to use the TWS-434 RF transmitter, and RWS-434 RF receiver with the BASIC Stamp -- for a quick & simple RF communications project. __ Designed by Reynolds Electronics
Wireless RF PWM Dual Motor Controller - This is a very simple Wireless RF transmitter circuit that consists of the Holtek HT-12E encoder chip and AM 418MHZ-transmitter module (WZ-X01, other similar device can be used). Using the hybrid RF xmit/receive modules make building the RF remote control a lot easy __ Contact info @ wzmicro.com
Zero-Bias Detector Yields High Sensitivity Weith Nanopower Consumption - Magazine Design idea s February 1998__ Linear Technology/Analog Devices