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Miscellaneous Circuits

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

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:

Radar Detector-W1SNN -  Schematic only __ Designed by va3iul

ReFlow Soldering of Lead-less LTCC Products -  AN-40-004 App Note__ MiniCircuits.com

Return loss vs. VSWR table -  Application Note__ MiniCircuits.com

Salt Water Battery -  About 13 years ago, I made a salt water battery to operate a single AA battery quartz clock.  It ran for several months until I got tired of adding water to compensate for evaporation.  The batttery consisted of 5 cells each producing about 300 millivolts.  As I remember, I used 5 small olive jars filled with about a cup of water and a tablespoon of salt to create 5 cells in series each producing about 300 millivolts for a total of around 1.5 volts.  The positive electrode was made from a strip of double sided copper circuit board (about 1 inch by 4 inch) and the negative electrode was a similar sized strip of aluminum. __ Designed by Bill Bowden

Save 3 DB Of Output Power using Feedback to Set the Output Impedance -  10/06/11  EDN-Design Ideas - You can use this with high-side or low-side output current sensing.   __ Circuit Design  by Vic Jordan, Carson City, NV

Save Valuable Picoseconds using ECL-Wired OR -  05/15/08 EDN-Design Ideas - Substituting wire-OR connections for an XOR/XNOR ECL gate allows the circuit to meet stringent timing contraints __ Circuit Design  by Glen Chenier, TeeterTotterTreeStuff, Allen, TX

Scheme Cancels Amplifier Error -  12/09/99 EDN-Design Ideas - The circuit in Figure 1 , using a low-offset amplifier, is a basic ohmmeter circuit common in multimeters, except for the addition of the two.   PDF has many sicrcuits, scroll for this one.    __ Circuit Design  by David Magliocco, CDPI, Scientrier, France

SCR inverter -  The only drawback with this circuit is that it might latch in the conducting state if the load is too heavy or if there is a short at the output, this requires some kind of protection, on the input line, in the form of a fuse or similar.  The transformer__ 

Select ISA interrupts without jumpers -  10/26/95 EDN-Design Ideas - In "Software configures IBM PC interrupts," by Said Jackson (EDN, Nov 10, 1994, pg 90) , the author addresses a problem and proposes a practical solution.  The circuit in the author's design uses four ICs and a resistor package and requires an external address decoder.  A more practical solution is the GAL20V8, or equivalent, PLD (Fig 1) , which integrates most of the vital features of Jackson's circuit in one chip.    __ Circuit Design  by Jerzy Chrzaszcz, Warsaw University of Technology, Warsaw, Poland

Selecting Pull-up Inductors for UPC27XXT Amplifiers with Open Collector Ouput 7/23/96  -  App Note  Doc #922__ California Eastern Laboratories

Selecting SPI Clock Modes for Interfacing the MAX1132 ADC with the MAXQ2000 MicroController -  App Note 4195-- 3/25/2008 -- (add 5/08) __ Maxim Integrated

Selecting the best inductor for your DC-DC converter -  Coilcraft RF Magnetics App Note- __ Designed by Coilcraft Power Magnetics Application Note

Selecting the best resistor technology for the application -  EDN-Design Ideas - 12/17/12     The choice of components for every application involves tradeoffs.  When it comes to resistors, several device technologies are available to designers and each of them makes sense for a certain subset of applications depending on cost-benefit analyses.  But when the application requires stability over time and load, initial accuracy, minimal change with temperature, resistance to moisture, and a number of other characteristics, the choices are more limited.    __ Circuit Design  by Yuval Hernik, Director Application Engineering, Vishay Precision Group  VPG

Sequencing Neons (NE-51 / NE-2) -  This circuit is similar to the LED clock using 12 neon indicator lamps instead of LEDs.  It operates from 2 high capacity ni-cad cells (2.5 volts) which keep it going for a couple weeks.  High voltage (70 volts) for the neon lamps is obtained from a small switching power supply using a 74HC14 Schmitt trigger squarewave oscillator, high voltage switching transistor __ Designed by Bill Bowden

Seven Nanosecond Comparator for Single Supply Operation -  AN72 AN72 is an extensive discussion of the causes and cures of problems in very high speed comparator circuits.  A separate applications section uses the 7ns LT1394 in V-to-F converters, crystal oscillators, clock skew generators, triggers, sampling configurations and a nanosecond pulse stretcher.  Appendices cover related topics.  __ Linear Technology/Analog Devices

Signal-swapping layout simplifies Debugging -  10/23/97 EDN-Design Ideas - One pesky challenge that development engineers often encounter is the seemingly simple task of connecting the target system to a dumb or ASCII terminal for debugging or development.  As the saying goes, __ Circuit Design  by Mike McKean, Motorola Semiconductor, Phoenix, AZ

Simple Circuit DIY Induction Heater -  This great little project demonstrates the principles of high frequency magnetic induction.  The circuit is very simple to build and only uses a few common  components.  With the induction coil shown here the circuit draws about 5A from a 15V supply when a screwdriver tip is heated.  It takes approximately 30 second for the tip of the screwdriver to become red hot!__ © RMCybernetics

Simple Circuit metal Detector based on a PIC12F683 microcontroller -  The idea of this circuit is to hack PIC oscillator circuit, by replacing the crystal by a coil : the frequency of the oscillator then depends on presence of metal near the coil, just like in a classic metal detector. __ Designed by Bruno Gavand

Simple Circuit technique speeds Microstrip breadboarding -  07/22/99 EDN-Design Ideas - Superglue and some thin, sheared pieces of Teflon copper-clad material are all you need to easily produce Microstrip-type structures for breadboarding high-frequency analog or RF circuits.    __ Circuit Design  by Steve Hageman, Hewlett-Packard Co, Santa Rosa, CA

Single IC Power Factor Corrected Off-Line Supply -  DN143 Design Notes__ Linear Technology/Analog Devices

Single LTC1149 Provides 3.3V & 5V Surface Mount -  DN77 Design Notes__ Linear Technology/Analog Devices

Slashing Time-to-Market—Part 1 -  The emerging technology of system-level verification enables a simultaneous validation of PCB, pre-silicon designs and software.  This results in dramatic reductions in time-to-market as well increasing product quality.  The traditional approach is to wait until IC prototypes have been produced, which is normally a two- to three-month process, before beginning the process of system-level verific __ Circuit Design  by Ray Turner

Smart Rock -  DN161 Design Notes__ Linear Technology/Analog Devices

Soft On/Off Switch -  Modern electronic equipment incorporate "push-to-on-push-to-off" switches that do not make noise as with old equipment.  An example of this is the power button on a ATX computer cabinet.  Here is a circuit that does the same.  It can be used to turn on/off__ 

Soldering surface Mount components -  Coilcraft RF Magnetics App Note- __ Designed by Coilcraft Power Magnetics Application Note

Soldering technique reduces PC-Board damage -  05/21/98 EDN-Design Ideas - (File has several  circuits, scroll down) In testing and troubleshooting surface-mounted components, changing parts can be time consuming.  Moreover, desoldering and soldering cycles can loosen and damage circuit-board pads.  To minimize damage to the pc board and to quickly remove a component, you can use low-temperature solder.  One low-temperature alloy is indium-tin, in a 50/50 mixture.  In-Sn melts between 118 and 125°C (tin-lead melts at 183°C).   __ Circuit Design  by Virgil Lawrence, Micro Linear Corp, San Jose, CA

Something from nothing -  09/15/05  EDN Tales From The Cube: In the early 1980s, as was just beginning, we had a fundamental problem: products in development but none to sell.  But, we wanted prospective customers to know our name and what we were up to.  Our public-relations company glibly urged "controlling the press" and "getting our message out" but offered little real substance.   __ Circuit Design  by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke.  He was 63.

SOT-23 1kHz to 30MHz Oscillator with Single Resistor Frequency Set -  DN262 Design Notes__ Linear Technology/Analog Devices

Speed Microstrip breadboarding -  07/22/99 EDN-Design Ideas - Superglue and some thin, sheared pieces of Teflon copper-clad material are all you need to easily produce Microstrip-type structures for breadboarding high-frequency analog or RF circuits.    __ Circuit Design  by Steve Hageman, Hewlett-Packard Co, Santa Rosa, CA

Stablised Power Supply for Prototyping -  This stabalised power supply circuit may be directly connected to 230V AC mains to derive output voltages of 3V to 12V DC for connection to the prototyping board.230V AC mains input...__ Electronics Projects for You

Switch Yields Programming Voltage for Flash µCs -  08/01/96 EDN-Design Ideas - Flash µCs are gaining in popularity because of their low cost and ease of use.  For example, Atmel's 8051-compatible mCs range from 40-pin drop-in replacements to 20-pin devices.  The problem with new flash µCs devices is the need for support tools, such as suitable flash-memory programmers.   __ Circuit Design  by Dhananjay Gadre, IUCAA, Pune, India


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

 


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