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Miscellaneous Circuits

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Last Updated: October 24, 2017 02:55 PM

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

IC PaIR Provides Auto-Level-Set Pentium Pro Power -  EDN-Design Ideas - 11/09/95    Unitrode’s UC3886 PWM controller and UC3910 4-bit DAC and voltage monitor collaborate to power the Intel Pentium Pro P6 µP at its correct rail voltage.  The P6 includes four internally set package pins that indicate, via binary code, what nominal value a device requires.  Designers have to supply several amps of dc power at the indicated nominal rail voltage between 2.4 and 3.4V, according to the voltage grade of the CPU IC. __ Circuit Design  by Bill Schweber Unitrode Integrated Circuits Corp, Merrimack, NH

Ideal transformers aid in balanced-line analysis -  02/15/00 EDN-Design Ideas - Transmission-line transformers combined with appropriate resistor values are useful in hybrid applications over limited bandwidths.  One such device, the 180° hybrid combiner, is useful in CAD analysis for verifying the performanc __ Circuit Design     by Alan Victor, IBM Microelectronics, Research Triangle Park, NC

Ignition Coil Buzz Box -  Here's a circuit to create a buzzcoil using a standard automotive ignition coil.  A 556 dual timer is used to establish the frequency and duty cycle of the coil current.  One of the timers is used as an oscillator to generate the 200 Hz rectangular waveform needed to control the (IRF740 MOSFET) while the second timer __ Designed by Bill Bowden

Implement a Simple Circuit Digital-Serial NRZ Data-Recovery Algorithm In an FPGA -  11-Jun-09 EDN-Design Ideas - A shift register and some logic lets you recover embedded clocks from data streams __ Circuit Design  by Jef Thoné and Bob Puers, ESAT-MICAS, Katholieke Universiteit Leuven, Leuven, Belgium

Inexpensive APRS Weather Station -  There are two kits you need to get for this weather station.  The first is the outdoor sensor.  It costs about $80 and can be bought online from the AAG.  http://www.  aag.  com.  mxThis kit provides the sensor unit (some assembly required) and an interface that allows you to hook it up to your __ Designed by Will Beals

Inherent power supply rejection scheme improves Sensorsystems -  11/07/96 EDN-Design Feature  Using inherent power-supply rejection, you can reduce errors that supply-voltage fluctuations cause in sensor systems that operate at high supply voltages.  The scheme relies on the ratiometric properties of sensors and A/D converters __ Circuit Design  by Eric Jacobsen, Motorola

Inverter -  generates a negative supply in a battery circuit for split power supply circuits.   __ Contact IQ Technologies

JPEG Parameters Determine Compression-System Performance -  EDN-Design Ideas - 01/18/96   The wide availability of JPEG software and hardware simplifies image-compression system design.  Before using the equipment, you must resolve quantization table design and system performance.  You can easily design an image-compression system using an off-the-shelf Joint Photographic Experts Group (JPEG) compressor with the suggested default-parameter tables.  Predicting the system’s performance in terms of image quality, compression ratio, or processing time is not as simple, however.  To attain predictable system performance, you must determine the algorithm parameters that achieve your design goals. __ Circuit Design  by Debora Grosse, Unisys Corp

Knight Rider -  an adaption of the light bouncer makes a classic light chaser __ Contact P. Townshend - EduTek Ltd

Layout & probing techniques ensure low-noise performanc -  02/02/98  EDN Technical Article: A cavalier attitude regarding a low-noise design is a direct route to disappointment.  Achieving and maintaining the low-noise potential requires judicious layout, probing, and connection techniques.   __ Circuit Design  by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke.  He was 63.

Lazer Tag Equipment Modifications -  I added a "fast-fire" circuit to get around the annoying delay that prevents you from firing again immediately.  It used the target LED contact on the trigger switch to reset the pulse generator.  That way, normally when you fire the sound goes on for its normal duration (we banned any mod that would turn off the sound or always __ Designed by John DuBois

Linear Amp -  This is a rather unusual QRP Power Amplifier design, with a wide frequency response; within a three dB's from 300KHz to 30MHz.  Overall gain is in the region of 16dB, and the final output power may be well over four watts __ Designed by Harry Lythall-SM0VPO

LNS Technologies Levitator Kit -  Schematic Only __ Designed by Barry Hansen

Look-up table eliminates the need for an IC -  08/26/10 EDN-Design Ideas - With some simple code, you can drive a seven-segment display directly from a microcontroller.    __ Circuit Design  by Abel Raynus, Armatron International, Malden, MA

Low Input Voltage CCFL Power Supply -  DN133 Design Notes __ Linear Technology/Analog Devices

Low-cost biass serve HF & VHF bands -  09/14/00 EDN-Design Ideas - Bias circuits are passive networks that you use to apply dc excitation to various active circuits.  The monitor tee, which is also known as the bias tee, has been commercially available for more than 40 years at microwave frequencies.  The original products provide useful frequency ranges of two to one through five to one.  More recent cost-effective bias tees cover 0.1MHz to more than 4 GHz.  Other designs are available that extend well into higher microwave-frequency bands (Reference 1).  Another bias circuit is the bias-passing attenuator, which is also commercially available at microwave frequencies __ Circuit Design  by Richard Kurzrok

Lowest Noise SOT-23 LDOs Have 20µA Quiescent Current 20µVRMS Noise -  DN220 Design Notes __ Linear Technology/Analog Devices

LT1182 Floating CCFL with Dual Polarity Contrast -  DN99 Design Notes__ Linear Technology/Analog Devices

LT1776 Provides Power for the IEEE1394 Fire Wire -  DN191 Design Notes__ Linear Technology/Analog Devices

LTC1069-X: a New Family of 8th Order Monolithic Filters in an SO-8 Package -  DN147 Design Notes__ Linear Technology/Analog Devices

LTC1564: a Digitally Tuned Antialiasing/Reconstruction Filter Simplifies High Performance DSP Design -  DN276 Design Notes__ Linear Technology/Analog Devices

LTC1628-SYNC Minimizes Input Capacitors in Multioutput High Current Power Supplies -  DN249 Design Notes__ Linear Technology/Analog Devices

Magnetic levitation project from Electronics Now, February 1996 -  Thirty years after Popular Electronics published a levitator, Electronics Now offers an updated design.  The transistor count went up from three to six, and added two op-amps.  However, this design includes a number of improvements such as easy-to-find modern components, and overheating protection.  I found this article especially heLPFul, as it provided the idea for lead compensation to achieve stability. __ Designed by Barry Hansen

Magnetic levitation project from Popular Electronics, May 1966 -  Magnetic levitation is so fascinating that it appears in electronics hobbyist journals from time to time.  This project from Popular Electronics dated May 1966 is a simple and effective circuit.  However, the parts are obsolete and they published a new levitator in May 1989. __ Designed by Barry Hansen

MDAC Makes Digital-To-Inductance Converter -  09/26/96 EDN-Design Ideas - The circuit in Figure 1 provIdeas programmable simulated inductance with 8-bit resolution, without the use of inductive components.  The circuit uses the reactance of capacitor C1 to form a programmable gyrator.  Possible applications for the converter include programmable filters, generators, equalizers, digital LCR meters and bridges, and tank circuits.  The circuit uses a multiplying D/A converter (MDAC) , three op amps, four resistors, and one capacitor. __ Circuit Design  by Alex Belousov, Consultant, Rego Park, NY

Measuring speed of light using an oscilloscope -  Schematic only __ Designed by va3iul

Method provides Simple Circuit error-rate generator -  12/23/99 EDN-Design Ideas - Testing the performance of a system being fed random errors can be tricky; it is not easy to add an accurate, low-level bit-error rate to a data stream.  The technique shown in Figure 1 uses a PC, some simple software, and a few e __ Circuit Design     by J Williams

Miniature power splitters -  AN-10-002 App Note__ MiniCircuits.com

MNA, Low Profile, Low Cost, Fully Integrated Monolithic Microwave Amplifiers -  AN-60-016  Application Note __ MiniCircuits.com

Monostable Flip Flops (one shot) -  The two circuits below illustrate using the 555 timer to close a relay for a predetermined amount of time by pressing a momentary N/O push button.  The circuit on the left can be used for long time periods where the push button can be pressed and released before the end of the timing period.  For shorter periods __ Designed by Bill Bowden

MOSFET Temperature Protection -  Schematic only __ Designed by va3iul

Multiple Output Isolated Power Supply Achieves High Efficiency with Secondary Side Synchronous Post Regulator -  DN299 Design Notes__ Linear Technology/Analog Devices

Multiple Power Supplies Track During Power Up -  DN272 Design Notes __ Linear Technology/Analog Devices

Near-Field PCS Phone Jammer -  Schematic only __ Designed by va3iul

Negative Resistance Increases Inductor's -  03/30/95 EDN-Design Ideas - The circuit in Fig 1a synthesizes a negative resistance.  Putting this network in series with the inductor in Fig 1b increases the inductor's Q factor.  Fig 1b's filter was designed to attenuate a noise-power-ratio test signal's adjacent carriers of 200 kHz __ Circuit Design  by Victor Koren, Orckit Communications Ltd, Tel Aviv, Israel

New Low Power High Output Current Dual CF Makes x DSL Line Driving Clean & Easy -  DN187 Design Notes__ Linear Technology/Analog Devices

New QFN & DFN Surface Mount Packages from Linear Technology -  DN999 Design Notes __ Linear Technology/Analog Devices

No Design Offline Power Supply -  DN62 Design Notes__ Linear Technology/Analog Devices

Miscellaneous:     #'s - H     I - N     O - P     R - S      T - Z


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