(9435) PCI Performance Measurements - Concepts and Practical Application:  Agilent Application Note   (app note added 6/06)

µC controls digital potentiometer :  10/08/98 EDN-Design Ideas  / (added 11/05)   

µC Implements Pushbutton Light Dimmers:  06/18/98 EDN-Design Ideas / (added 08/05) A project required building a synchronous-demodulator circuit to track a line drawn on paper.  beauty of  synchronous-modulator/demodulator approach is its inherent noise rejection.  method rejects nearly all out-of-band noise, wher from internal drift or external illumination. This rejection is a boon in optical tracking, where  return signal is inevitably buried in 120-Hz ambient light, amplifier offsets, and temperature drifts.  circuit in Figure 1 is inexpensive, and it operates from 5V dc.  circuit scans eight LED/sensor pairs every 22 msec and stores  result in eight sample/hold (S/H) capacitors for interrogation by a µP-driven ADC.  purpose of  circuit is to determine which sensor is above  line.

10 Tricks for Interfacing to the PIC16c508:  (electronic circuit added 7/03)

101 at Keyboard to Ascii Decoder:   Host to Keyboard Protocol is initiated by taking  KBD data line low. However to prevent  keyboard from sending data at  same Time that you attempt to send  keyboard data, it is common to take  KBD Clock line low for more than 60us. This is more than one bit length. n  KBD data line is taken low, while  KBD clock line is released. (added 4/02)

12c508 Smart Lock:   base sends a data sequence ( password) which is recognized by  key.  key checks  sequence and -if it recognizes it -sends to  base anor data sequence, as an answer to  password. At  Time when  base gets a correct answer (which means that  key has been introduced),  relay is put into action, and it can command a number of consumers. (added 4/02)

15-Step Digital Power Supply:  (electronic Circuit / Schematic added 10/04)

16 bit adjustable reference uses 8 bit digital potentiometers:  12/25/03 EDN Design Ideas  /  (added 6/06)  It may be easy to find a precision voltage reference for your application; however, a programmable precision reference is anor matter.  circuit in Figure 1 yields a precision reference with an LSB of 62.5 µV.  circuit is a 16-bit DAC using three 8-bit digital potentiometers and three CMOS op amps....

16 Bit PC Serial Port Receiver (Cmos):  (electronic circuit added 10/05)

2 Transistors Form Bidirectional Level Translator:  11/07)/96 EDN-Design Ideas / (added 5/03)   -Illustrates a translation from5 to3V, but it can accommodate almost any or voltage levels, provided  logic-low levels are equal (usually0V), translation from1 to100-Volt are possible although slow.

2 Wire LCD Interface using PIC16cf84:  (schematic / circuit design added 9/02)

20 Watt Class a Power Amplifier:  (schematic / circuit design added 9/02)

25 Watt MOSFET  Amplifier:  High Quality simple unit. No need for a PreAmplifier (added 6/06)

2-Digit Counter using the PIC12F629 chip:  (circuit / schematic design added 2/07)

3.3V Bus Switches for PC100/PC133 Dimm Switching:  Pericom Semiconductor Application Brief # 032 (app note added 02/05)

32 Bit Serial Receiver (57.6 K Baud TTL and CMOS):  (electronic schematic / circuit added 11/05)

32.768 Khz Oscillator using a Common Watch Crystal:  (electronic circuit added 10/05)

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

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

51 MHz Frequency Counter Voltage Meter and SwR/PWR Indicator:  (electronic Circuit diagram added 02/07)

5V Logic Pulser is Battery-Powered:  09/16/99 EDN Design Ideas  /  (added 11/05)  A battery-powered, pushbutton-triggered TTL/CMOS-compatible source of debounced 5V logic pulses is a simple but handy piece of test equipment to have in any tool kit (Figure 1). The circuit's battery-powered operation complicates what would orwise be a trivial exercise in switch-bounce and timing-circuit design. The convenient use of battery power simultaneously imposes two requirements: near-zero quiescent-current draw and input-variation-tolerant voltage regulation. A near-zero quiescent-current draw minimizes  likelihood that you will encounter a dead battery when you need to use  logic pulser, and input-variation-tolerant voltage regulation accommodates  inevitable voltage droop as  battery ages and traverses its service-life curve from fresh to flat....

6090 Digital Decoder Schematics:  (electronic circuit added 4/05)

68HC11 Function Generator:  (electronic schematic / circuit added 11/05)

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

68HC11 Stepper Motor Control:  (circuit added 7/02)

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

8 Hints for Debugging Microcontroller Based Design:  Agilent Application Note   (app note added 6/06)

8 Hints for Debugging Siemens MCU-based Designs:  Agilent Application Note   (added 6/06)

8 pin µC forms one-chip Programmable VCO :  09/24/98 EDN-Design Ideas  / (added 11/05)   The circuit in Figure 1 uses a Microchip 8-pin µC (PIC12C671) as a voltage-controlled oscillator (VCO). Because  PIC12C671 has an internal 4-MHz oscillator, four-channel 8-bit A/D converters, and built-in power-reset circuitry, you need no external components to configure  VCO. The µC reads two analog inputs through AN0 and AN1. The reference voltage for  A/D conversion is  µC's power supply VDD. The converted 8-bit data determines  duration of output high and output low. Assume, for example,  digitized outputs from AN0 and AN1 are 43 and 87, respectively. Timer 0 loads  43 after  µC sets output GP2 to logic one. Timer 0 receives its timing from  internal clock....

8051 Development System Circuit Board #1:  (electronic circuit added 7/03)

8051 Development System Circuit Board #2:  (electronic circuit added 4/05)

8088 Maximum Mode SBC:  (electronic circuit added 4/05)

8-Bit LPT Characterization and Qualification Data:  Pericom Semiconductor App Note # 007) (app note added 02/05)

9 Second Digital Readout Countdown Timer:  This circuit provides a visual 9 second delay using a 7 segment digital readout LED. When the switch is closed, the CD4010 up/down counter is preset to 9 and the 555 timer is disabled with the output.... (added 2/07)

9 Second Digital Readout Timer:  (circuit / schematic design added 6/06)