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Microprocessor Circuits
Microprocessors:  #'s - B      C - F      G - K      L - M      N - P      Q - S      T - Z

Last Updated: December 29, 2017 03:15 AM

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

Line level Signal to microphone input adapter - Sometimes there is need to convert line level signals to such signal that it can be connected to microphone input.  Because the line level signals are typically in range of 0.5.2V and the microphone signals are in millivolt range, quite much attenuation is needed to match the signal levels.  This means that typically you will need 40-50 dB of attenuation __ Designed by Tomi Engdahl

Line ReversalUsing a PIC16c508 - Scroll to find this circuit #4- If a device is connected between two output lines as shown in fig: 5, a program can be written so that the device sees a voltage reversal.  When one output is HIGH the other is LOW and this is then reversed.   __ Contact: Colin Mitchell

LiPoly charging with MCP73833 - For my latest projects I used a lot of single cell lipo batteries.  They are really nice.  High power density, low self-discharge, no memory effect and they can deliver quite an amount of current.  But lipo battery handling is a bit more complicated __ Designed by Alexander Weber

Lithium Ion Battery Charger - PIC Project  Lithium Ion batteries pack a lot of power by weight compared to other types.  There are 2 things that need to be handled differently than NiCad on NiMH
: __ Designed by Luhan Monat-Mesa Arizona

Litter Box - PIC Project  Not every new use of technology requires a microcontroller.  This one uses a 12 volt computer fan from CompUSA, a snap close food box from Walmart, some PVC pipe from Home Depot, and a large plastic storage container from Big Lots.   __ Designed by Luhan Monat - Mesa Arizona

LM35 termometer - an adjustment termometer by LM35 this file simulated by Proteus 7.2 and micro program is on Bascom __ Designed by rajbai.somee.com

LM3909 LED flasher - LED flasher with the LM3909 IC and runs from1.5-Volt battery.   __ Designed by Tony van Roon  VA3AVR

Logic analyzer pushes microcontroller to its limit - 12/07/00  EDN-Design Ideas - A simple logic-analyzer design is compatible with all versions of Windows and pushes the PIC 18C252 chip to its speed limit to achieve a 1-MHz sampling rate  (Figure 1) .  The circuit can examine three channels of relatively low-speed logic signals that have infrequent, or sparse, transitions.  The analyzer can record only 510 transitions per run, but a run can last as long as several minutes, if necessary.  Applications include monitoring the I/O of an IBM keyboard or printer port, TI-calculator intercommunication, and serial  (RS-232) signals __ Circuit Design by Tom Lyons Fisher, Inexpensive Systems, Huntingdon, PA, and Michael Deskevich, Juniata College, Huntingdon, PA-December 7, 2000

Look-up table helps bit flipping - EDN-Design Ideas - May 03, 2001    In certain instances in embedded software, a programmer needs to flip the order of the bits in a byte so that B 7 to B 0 become B 0 to B 7 .  Bit flipping is useful, for example, when a synchronous serial port does not allow programmatic selection of bit order, such as MSB first or LSB first, for its shift register.   __ Circuit Design by Brad Bierschenk

Loudspeaker Protector & Fan Controller - Install it in the Ultra-LD Amplifier and protect your speakers against output stage faults.  The fan control is a bonus.__ SiliconChip

Low Cost 1HZ 10MHz Function Generator - Direct Digital Synthesis  (DDS) makes it very easy to design a low-cost, high-performance function generator - one of the handiest pieces of test gear you can have.  This one can be set to any specific frequency between 1Hz and 10MHz and offers both sine and square wave output.__ SiliconChip

Low cost Atmel in-system Programmer - I found the schematic of this programmer in my "AVR software and technical Library - April 2003" CD-rom and decide to publish it.  The reason was, that this programmer is very stable and works perfect with AVR Studio 4.   I had tested it before published it, with AT90s2313 and its worked fine!!!
To work this programmer you must to connect a crystal  4MHz to slave device at the XTAL1 and XTAL2 pins, or if you have an device with internal oscillator    (AT90S2343, ATmega161 etc) and its enabled , its not need any external oscillator. __ Designed by © Vassilis Serasidis

Low Cost Dynamic VID Power Supply for Pentium® III Processors - Design Solutions 7 Design Notes__ Linear Technology/Analog Devices

Low Cost Very High IP3 Low Noise Amplifiers Cover 250MHz to 2300MHz - Application Note__ MiniCircuits.com

Low cost video Motion Detection - This device uses a PIC16F819 and an LM339 to detect motion on a video signal.  The incoming video is 'clamped' using one section of the LM339, the sync tips are detected with another section, and a 3rd section can detect VBI or other data.   __ Designed by Luhan Monat-Mesa Arizona

Low-Cost Analog On-Off Controller - Have you ever wanted to control a device based on an analog signal level? Perhaps you want to fill a water tank automatically or control exhaust fans based on humidity or temperature.  Well now, you can - provided you have a sensor that gives an analog voltage or current output.__ SiliconChip

Low-Cost AVR Programmer - To program some AVR microcontroller unit  (MCU) you will need an AVR programmer.  The better way to do that, is to buy some development kit like STK-500.  This kit have the advantage to give you serial port, LCD connector, SRAM socket, 8 switches, 8 LEDs, connectors for all of the ports of MCU and more, to one board.  I suggest to beginners, to start working with STK 500 or some else development system, it will help them very much.  For the people that are want to program only one piece of AVR, to make some circuit from this site and they don't want to spend money for any development kit, the solution is this ultra low-cost AVR programmer.  

Low-cost programmer for dsPICs & PICs - This low-cost unit can program all dsPIC30F series microcontrollers in the DIP package, along with most PIC microcontrollers.  It's easy to build and uses standard parts.__ SiliconChip

Low-Cost PWM Module for Arduino or Development Kit with Mcu - This short article describe simple circuit capable to convert a TTL/CMOS PMW signal to analog signal. The circuit can be used as extension shield for Arduino, with simple MCU or with TTL/CMOS ...__ Electronics Projects for You

Low-Power timer - Low power timer.  It can operate with a CR2032 lithium battery.   __ Designed by The Electronic Lives Manufacturing-presented Chan

Low-Voltage Remote Mains Switch - This circuit allows a 240V mains appliance to be controlled remotely via low-voltage cabling and a pushbutton switch.  The mains appliance  (in this case, a light bulb) is switched with a suitably-rated relay.  All of the electronics is housed in an ABS box located in proximity to the appliance.  The pushbutton switch and plugpack are

Low-voltage reset operates below 2.7V - EDN-Design Ideas - March 26, 1998    [ NOTE : File has multiple design, scroll for this one.]  New personal digital assistants, pagers, and other battery-powered systems operate at or below 2.7V, but power-on resets with thresholds below 2.6V are not commonly available. You can resolve this problem using a circuit that combines a 1.2V reference and a micropower regulator  (Figure 1a) . IC1 integrates these two functions in a tiny SOT-143 package. __ Circuit Design by Bob Kelly, Maxim Integrated Products, Sunnyvale, CA

LP Doctor - Clean up the clicks & pops on your vinyl records with the LP Doctor__ SiliconChip

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Microprocessors:  #'s - B      C - F      G - K      L - M      N - P      Q - S      T - Z 

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