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Program Interrupts,
Error Trapping, Program Workspaces - Scroll to find this
circuit. . . [Analog Devices-Analog Dialogue by Sylvan, John]
Program Matches Filter-Network Impedances - 07/20/95 EDN Design Idea In RF circuits, it's often necessary to match one impedance to
another. The program in the Listing 1 can design a network to match any resistive impedance R1 to another R2
(where R1 is less than R2] at a specified frequency and sp. . . [by David Kirk[by, University College, London,
UK]
Program predicts VSWR-mismatch RF uncertainties - 02/01/01 EDN Design Idea Hewlett-Packard (now Agilent Technologies] once offered a useful
little cardboard slide rule for calculating the uncertainty in RFmeasurements stemming. . . [by Steve Hageman,
Agilent Technologies, Santa Rosa, CA]
Program provides
integer to binary Conversion - 03/02/98 EDN Design Idea
(File had multiple circuit ideas. Scroll to find this one. )Binary numbers rarely appear in applications of C or
C++ programs, so any reference to converting from an integer to a binary number is usually relegated to a few
simple examples in the appendix. However, when you're working with codes for communication systems, terms such as
parity, checksum, distance, weight, and block codes are much easier to verify with a check solution when they are
in binary form. . . . [by Bert Erickson, Fayetteville, NY]
Program Provides ISA-Bus DLL for Window - 09/28/95 EDN Design Idea Windows commonly uses a dynamic link library (DLL) to create
subroutines and procedures that all compatible software can call. A DLL is an executable file, with extension .
DLL, that a program can load and unload as required. However, not all Windows-based software can read from and
write to the ISA bus in a PC. The DLL described here provides 8- and 16-bit I/O reads and writes to the ISA bus.
. . . [by Paul Kemp, NASA Johnson Space Center (Houston, TX)]
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. . . . [Wichit
Sirichote, designer]
Programmer Hardware Tester - Notice that the schotty diode allows the DIY Programmer to feed its VCC without its VCC
being shorted to the PIC's normal power supply. A tiny DIP switch will also work in place of the diode. NOTE: the
diode is very convenient when developing the code, but it drops about 100mV of the VCC provided (but was never an
issue in my designs. Simply do NOT power the PIC while programming it. . .
Programming adaptor for 8 and 28 pin AVR
Microcontrollers using ISP - Okits not pretty, but its
practical. The 20 pin connector at the far right is left over from a diffferent project and is no longer used.
This adaptor lets me program 8 or 20 pin DIP devices using the In-System Programmer (ISP) described in Atmel's
AVR910 application note. This circuit provides power and clocks for the part to be programmed and power to the
ISP circuit. When programming 8 pin devices, the part is positioned toward pins 1 and 20 of the socket such that
the 8 pins of the chip occupy the pins 1, 2, 3, 4, 17, 18, 19, abd 20 of the programming socket. In the case of
an 8 pin part being programmed, the SPST switch that grounds pin 4 must to be closed. Conversely, when
programming a 20 pint part, the switch on pin 4 must be open so the crystal can be used for the clock for the
part being programmed. . . . [From Dick Cappels' project pages]
Programming the Automatic Fan Speed Control Loop - AN-613 Analog Devices Application Note. . .
Protect Computer's Input -
05/26/94 EDN Design Idea The circuit in Fig 1 performs input protection, level translation, isolation, and
debouncing. The circuit allowed the output of a relay driver to connect to a computer even though the relay
driver delivered a voltage as . . . [by Ang Tzu Seng, Halliburton Drilling Systems, Singapore]
Protecting Data I/O Ports with TVSArrays - MicroNote 121. . . [Microsemi Corp]
Protecting Data in Serial EEPROMs - Application Note . . . [National Semiconductor]
Protecting USB Data I/O Ports - MicroNote 117. . . [Microsemi Corp]
Protects Computer's Input -
05/26/94 EDN Design Idea The circuit in Fig 1 performs input protection, level translation, isolation, and
debouncing. The circuit allowed the output of a relay driver to connect to a computer even though the relay
driver delivered a voltage as . . . [by Ang Tzu Seng, Halliburton Drilling Systems, Singapore]
Provide4-to 20-mA loop for microcontrollers - 05/27/04 EDN Design Idea The 4- to 20-mA current loop is ubiquitous in the world of
controls in manufacturing plants. Discrete logic, microprocessors, and microcontrollers easily cover the digital
portions of control schemes, such as limit switches, pushbu. . . [by Robert Most, Dow Corning Corp, Auburn, MI]
Provides 4-to 20-Ma Loop for Microcontrollers - 05/27/04 EDN Design Idea The 4- to 20-mA current loop is ubiquitous in the world of
controls in manufacturing plants. Discrete logic, microprocessors, and microcontrollers easily cover the digital
portions of control schemes, such as limit switches, pushbu. . . [by Robert Most, Dow Corning Corp, Auburn, MI]
PS/2 Keyboard or Mouse
based on an Arduino - . . .
PS/2 Keylogger based on
PIC12F675 - This is a keylogger based on PIC12F675 with
64K eeprom ( 24LC512 ). When keylogger is connected between PC and keyboard it will record every keypress to
memory. By pressing a button recorded data will be sent back to PC so user can read it. No need. . .
PS/2® to USB Mouse Translator
- Application Note Published 4-May-04. . . [Microchip]
PTT and
soundcard interface for the TM255/455 - Schematic only, no
circuit description. . . [by Guy Roels ON6MU]
PTT and/or soundcard interface - Schematic only, no circuit description. . . [by Guy Roels ON6MU]
Pulse-Modulated Interconnect Cuts PLD Pinout - 03/28/96 EDN Design Idea The number of output pins available often places limits on
erasable-PLD (EPLD] designs. These limitations are especially true when a number of multibit signals emanate from
the same device. An N-bit signal and its data strobe take. . . [by V Krishnamurthy, Naval Physical and
Oceanographic Laboratory, Kochi, India]
Push Button Switch
Debouncer - This circuit will remove the transient spikes
and contact bounces from a non-latching push button switch. . . . [Andy Collison's website]
Pyranometer to Current
Converter - Simple circuit that enables long cable wiring
for pyranometer. Built with TI rail-to-rail opamp, TLV2451. . . . [Wichit Sirichote, designer]
Questions & Answers Concerning Serial EEPROMs - Application Note Published 26-Aug-97. . . [Microchip]
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