Pin Diagrams - Hardware schematic that shows pin diagram for common memory & interface chips __ Designed by Wichit Sirichote

PIR to IR remote control - After the third attack on my car in 6 weeks, loosing 35 litres of fuel and generally having my day stuffed up - I got really pissed off and embarked on the EKM-1 surveillance camera system.  Next time I want to get the act on video.  My first thought was to keep it simple and use a PIR  (passive Infra-red) motion detector to set off an alarm in my bedroom - then I would manually start my VCR and record video from a low-light camera __ Designed by Eddie Matejowsky

PlayPIC - This is a new design of a tutorial board based on the popular PIC16F84A microcontroller.  It features eight single leds, a 7-segment display, an LCD display and five push buttons.  It is an ideal solution for the beginner to take his/her first programming steps in the world of microcontrollers.  Having an in-circuit-programming  (ICP) header, it can be easily reprogrammed without unplugging the microcontroller each time, provided that the programmer also supports this feature  (like OziPic’er) . 
__ PlayPic

PlayPIC-A Tutorial Board for the PIC16F84A Microcontroller - This is a new design of a tutorial board based on the popular PIC16F84A microcontroller.  It features eight single leds, a 7-segment display, an LCD display and five push buttons.  It is an ideal solution for the beginner to __ Designed by Vassilis Papanikolaou

PLL synthesizing oscillator 1 - The PLL synthesizer oscillation circuit to introduce here is using the PLL frequency synthesizer  (MB87014A) .  It is possible to make oscillate the stable high frequency signal.  The PLL is the abbreviation of Phase Locked Loop.  In the operation of the PLL, it compares the frequency of the reference frequency oscillator and the frequency of the voltage controlled oscillator by the phase.  When there is a difference of the phase, it works as if to control the VCO and to lose the difference.  It controls repeatedly  (loop) like the oscillation frequencyphase comparisonvoltage controloscillation frequency.   __ Designed by Seiichi Inoue

PLL Synthesizing Oscillator 2 - In this page, I introduce the PLL synthesizer oscillator which used MC145163.  As for the operation principle of the PLL synthesizer oscillator, see "Principle of the PLL oscillator".  This IC for the PLL can specify a dividing ratio directly with the BCD.  The output of the BCD counter can be directly connected.  There is not a serial data generator, being necessary.   __ Designed by Seiichi Inoue

PLL Synthesizing Oscillator 3 - I introduce the PLL synthesizer oscillator by MC14046B which can change the frequency.  The PLL oscillator can be made using three kinds pieces of the ICs like the figure above.  Because most of the functions are stored in the ICs, there are few, too, circumference circuits and the making is easy.  The BCD  (Binary Coded Decimal) switch is used to change the frequency.   __ Designed by Seiichi Inoue

Pocket AV Generator - There are not many video test pattern generators on the market and the ones that are cost big dollars.  This kit is a fraction of the cost of commercially available units, it's portable and it has audio outputs as well!__ SiliconChip

POCSAG encoder/decoder (Zip file) - Microcontroller based electronic circuit __ Designed by © Henry Carl Ott N2RVQ, all rights reserved'

Polyphonic MIDI Tesla Coil Interrupter - Plays music - with sparks!

Pony Programmer - PonyProg is a serial device programmer software with a user friendly GUI framework available for Windows95/98/ME/NT/2000/XP and Intel Linux.  Its purpose is reading and writing every serial device.  At the moment it supports I²C Bus, Microwire, SPI eeprom, the Atmel AVR and Microchip PIC micro.  

Ponyprog for ATMEL'S AVR - The ATMEL AVR programmer works with the Windows program "Ponyprog" which works under 95, 98, XP, and can be found at [url]http://www.  lancos.  com/prog.  html[/url] On board the AVRs that can be programmed are those in the schematic.  For other members of AVR family or the rest programmable ICs that Ponyprog can program, there is the J1 connector  (CON10) which allows expanding the programmer's hardware.  See Ponyprog's site for other's ICs Ponyprog circuits.  The JUMP1 jumper is there to connect the crystal's circuitry to the 8- pin AVRs or to disconnect it.  Some AVRs have internal

Ponyprog for AVR & PIC16F84 - All resistors are 1/4W.  The circuit is powered by 915V DC or AC.  When In Circuit Programming  (ISP) connectors are used, is possible the programmer to be powered from target’s power source.  Diodes D2 and D6 protect the regulator LM7805, when target’s power is used.   __ Designed by Kyriakos Kontakos

Poor man's analog to digital converter (ADC) using a 2N222 transistor & a few passives - Years ago some of the then-old engineers working in the cost-completive area of consumer electronics told me, “If it can’t be done with a handful of resistors, caps, a 1N4148 diode and an MPS3904 or MPS2907 transistor, it ain’t worth doing.  ” __ Designed by Dave Wissel @ Wave Technology

Portable PIC Programmer - It's portable!__ SiliconChip

Potentiometer Programs & Stabilizes Voltage Reference - 05/30/02 EDN-Design Ideas - The potentiometer portion of a mixed-signal, digitally programmable potentiometer adds variability to an analog circuit, and its controls provide programmability.  You can use a potentiometer in two ways in an analog circuit.  You can use it as a two-terminal variable resistance, or rheostat, or as a three-terminal resistive divider.   / (schematic / circuit added 11/03] Design by Chuck Wojslaw, Catalyst Semiconductor, Sunnyvale, CA - May 30, 2002

Potentiometers & Analog-to-Digital Conversion with the PICAXE - Computers and micro-controllers don't understand real number measurements such as 2.5 volts.  They understand only "1" and "0", which strung together as a group of 8 bits form a byte, and as 16 bits a "word".8-bits can represent a numerical value of 0 to 255 while say 10-bits can represent 0 to 1023.  The PICAXE 18M2 also has a 10-bit ADC mode and the output requires a "word"  (16-bit) variable. __ Designed by Lewis Loflin

Power Controller - PIC Project  This device controls the power to 8 individual outlets.  There are 16 power levels available for each one.  Connection is made via 9600 baud serial using a din-5 connector.  A single byte sets the power level for any of the 8 channels.  Also, a global command sets all the power levels at once.   __ Designed by Luhan Monat - Mesa Arizona

Power Pak: a Multi-Voltage Power Supply - Robust devise provides a well-regulated, switchable 3V, 6V, 9V or 12V output from a car cigarette lighter or DC plugback supply.__ SiliconChip

Power up a microcontroller with pre-power-down data - 03/17/05 EDN-Design Ideas - It is sometimes necessary to retrieve data at power-up in the same way that they were at the last power-down, so that the product wakes up in the state it had before shutdown or to retrieve some measurement.  One approach is to save critical variables into EEPROM or flash memory as soon as they change Design by Stephan Roche, Santa Rosa, CA

PowerUp: Turns Peripherals on Automatically - Tired of flicking multiple power switches to turn on your PC or stereo System? Build this circuit and you'll only have to flick one switch.__ SiliconChip

Precision 10V DC Reference for Checking DMMs - Have you ever checked the calibration of your digital multimeter? Yeah, we know - you haven't because there is no easy  (read cheap) way of doing it.  But now you can with this precision DC voltage reference that can be built in a few hours.  Without any need for adjustment it will provide you with a 10.000V DC source accurate to within ?3mV, ie, an accuracy of ?0.03%.__ SiliconChip

Precision Active Filter Block with Repeatable Performance to 10MHz - DN324 Design Notes__ Linear Technology/Analog Devices

Printer Port Hardware Simulator - Simple circuit let's you test printers or other hardware that connects to a PC's parallel port without the need for a PC or software.__ SiliconChip

Probe Clip - PIC Project  Here is how to make a handy test clip.  This clip pierces and clamps on to a wire without much fuss or damage.  Its great for finding what all of those wires do under your dash board.   __ Designed by Luhan Monat - Mesa Arizona

Processor Controls Watchdog - 01/18/96 EDN-Design Ideas - The simple watchdog circuit in Figure 1 allows you to use the same line to provide additional information about the system's operation by closing or opening.    Design by Sergey Velichko, SCP, Boise, ID

Processor Power System Needs No Heat Sink - DN135 Design Notes__ Linear Technology/Analog Devices

Producing your own Decrypt Viewing Card Mk2 - This card is a "season type" interface card to connect your PC to your satellite decoder.  Using programs like "Decrypt" you will be able to view a number of encoded transmissions in Videocrypt and D2MAC.   __ Designed by JOOS DESIGN and PAUL ARNOLD

Program “Excelerates” Microcomputer-I/O Allocation - 112/05/08 EDN-Design Ideas - Use Microsoft Excel to organize how you assign I/O functions to microcontroller pins Design by Aubrey Kagan, Emphatec, Markham, ON, Canada

Program the AT89S8252 & 89S53 with Easy-Downloader V2.0 - Upgraded EZ52 to EZ53.  hex enabling the Easy-Downloader to program 89S8252 and 89S53 chips without any modifications __ Designed by Wichit Sirichote

Program turns PC sound card into a function generator - 09/02/99 EDN-Design Ideas - You can use a low-cost PC sound card as an analog-function generator by controlling the PC with the program "SoundArb.   " [To obtain SoundArb, download di2409setup.   exe, a 1.06-Mbyte self-extracting installation program.] Design by David Sherman

Programable LCD counter with memory backup - This counter based on AT90S1200A its  programmable and when shut it down its keeping  the  current counts to the memory, until to the  power on. __ Designed by © Vassilis Serasidis