Microprocessor Circuits   Page 1b
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Last Updated on: Friday, March 12, 2010 12:08 PM

3 Channel Analog Front-End DeviceOverview - Microchip Application Note Published 16-Dec-05   (app note added 2/06)

32.768 Khz Oscillator using a Common Watch Crystal - Below are a couple circuits you can use to produce a 32.768 KHz square wave from a common watch crystal. The output can be fed to a 15 stage binary counter to obtain a 1 second square wave. The circuit on the left using the 4069 inverter is recommended over the transistor circuit and produces a better waveform. The single transistor circuit....(electronic circuit added 10/05)

3-wire serial LCD interface - (added 6/07)

40+ MHz 5 Digit Frequency Counter with an AVR 2313 - (electronic circuit added 7/03)

4-Channel Timer using Atmel 89C4051 and MAX7219 display driver - (electronic circuit added 05/06/07)

4-Digit 24 Hour ON / OFF Timer - Comes with full diagrams, images, hex and asm files (translated) (circuit added 08/07/06)

5 Hints for Debugging Microcontroller-based Designs AN 1458 - Agilent Application Note   (added 6/06)

50 MHz Frequency Counter - This project is nice and small frequency counter that reads frequency from 1 Hz to 50 MHz that I have modified from original designed by Weeder Technologies . I have designed new PCB to fit with 16X1 LCD and change source code for compatible with new small PCB Specifications - Auto-ranging with floating decimal point. - Up to 7 digits displayed on 1X16 LCD. - Auto-adjusting gate speed (0.1 sec to 1 sec). - Microcontroller-based circuitry provides for simplicity, ease of assembly, and highly stable readout. - Sensitivity approximately 100 mV RMS (100 Hz to 2 MHz), 800 mV RMS @ 50 MHz. - Input overload protected. ….(electronic schematic added 11/08)

50 MHz Frequency Counter Voltage Meter and SwR/PWR Indicator - This is a successor of the PIC16C71 4-digit LED f-counter & V-meter. Some hard to find parts used in the previous version, which are out of production for some time, has been omitted. A rather early PIC16C71 has also been replaced by 28-pin device PIC16F876....(electronic Circuit diagram added 03/03/03)

500MHz PIC Prescaler - The prescaler kit is a simple divide by 10 ECL circuit which can be used to extend the range of most PIC based frequency counters from 50 MHz up to 500 MHz. The kit uses surface mount components except for the 78L05 regulator. ….(electronic schematic added 11/08)

500W Power-Factor-Corrected PFC Converter Design with FAN4810 / AN-6004 - Fairchild Application Notes / (app note added 6/06)

60 minute PIC Count Down Timer - On this page, I will introduce the Count-down timer with PIC16F84A. I am putting a count-down timer by the hardware on Electronic Circuits Application Garage. The function of the timer is the same as it approximately. (The stop switch is added) Because this unit was made compactly, the wiring of the back becomes quite complicated ….(circuit design added 11/08)

68000SBC - Build a 32-bit computing power single board with 68HC000, 256kB SRAM, 256kB Flash, RTC, UART, and GPIO.  ….(circuit design added 06/09)

68HC11 Based RDS Decoder - (electronic circuit added 7/03)

68HC11 Function Generator - (circuit added 7/02)

68HC11 Instruction Halts External RC Clock - 04/27/95 EDN-Design Ideas / (added 3/03)

68HC11 stepper motor control - (circuit / schematic design added 6/06)

68HC11 Synthesizes Accurate Sine Wave - 09/02/96 EDN-Design Ideas / (added 3/03)