Project Page for
Site last updated May 2,
Web Page Note: My
favorite HTML editor wont support XP Pro. I went to a simple HTML
editor. I am not adding many graphics these days but including PDF
files to documented projects.
Articles for Club Newsletters : For those needing an article for a club newsletter, please visit my New Ham Partner Page.
This page is for the projects of Gerry Crenshaw WD4BIS. Many of the projects are PIC and BASIC STAMP related. Projects for the "Home Brew" classes sponsored by the Garland Amateur Radio Club will be documented here as well. If a project for the GARC "Home Brew" class is being done from an Amateur Radio publication such as QST magazine from the ARRL credit will be given to the authors of the projects. Most of projects are related to amateur radio. Here you will find the schematics, parts lists, drawings and general ramblings, rants, code and assembly files for the projects.
Simplifed A-Tone Decoder (75T204 Based) and
Original A-Tone Decoder (75T202 Based)
This is a project for RACES members, here in the Dallas Tx. Area we send an DTMF A-Tone from a radio keypad prior to a net to alert members to weather or other nets.
for help. The Tone Decoder Decoder IC's (75T202, 75T204,
MC145436 etc) are getting very hard to
come by. What I am hoping is someone has or can write a program for a
PIC so it will preform the same function as a 75T204. This has been
talked about on various PIC discussion boards for years but a working
program has never been realized. See the logic
table on the A tone decoder page. It must decoded to all digits on a 16
digit keypad 0-9, #,*,A,B,C,D. It needs to be written for a
16F628. I can't seem to make it work. See
Basic Stamp Project Page
My first Basic Stamp projects. Automated Fox and a Keypad Garage door opener
PIC Project Pages
Countdown Timer, PIC Based Automated Fox
Battery Monitor Project A PIC based device to monitor a battery. 1999 CQ by WA0ZTI
Video Sequencer A PIC based
sequencer for video camera feeds.
Home Brew Connector Class
Molex Connectors, terminating RG8 Coax, Anderson Power Pole
connectors and Anderson Power Pole 5 and 12 port DC distributors
similar to Rig Runner. NOTE: The Anderson Power Pole has replaced the 2
pin Molex connector for Dallas Area RACES power connections starting
January 2005. (updated April 24, 2009)
Handi-Finder Class This is a simple device used for radio direction finding.
Making Printed Wiring Boards using a Laser
Printer How to make your own PWB's
PG-4S Programing cable This is a programing cable for Kenwood TM-7A Dual band radio and the TM-G707E. The resulting surface mount PWB is about the size of a postage stamp that is wedged between the pins of a DB9 connector. By building an adapter it can also be used for the TH-F6 / TH-G71.
Ethernet Cables and other RJ45 Connections
This page is to the answer the questions on Ethernet cables and other RJ45 connections I always seem to get.
Interfacing the Tiny TrakII to a Kenwood
This page shows how I interfaced the the TinyTrackII to my TM261.
Garmin GPS Interfaces
How I interfaced the Garmin GPS units to the TinyTrakII and PC. Here are the connections.
Watchguard Video System.
A fun little project that blinks a sequence of 16 LED's down the driveway for Christmas. The project grew and multiple strings can be triggered from a Master Unit. Circuit board, hex file, and schematic. (Added April 12 2009)
This is my version of a PIC Based controller for a Direct Digital Synthysizer 1-60 Mhz VFO (added April 12 2009)
Telemetry Modules for Motorola Quantar Radios
A PIC based voice alarm module and an Alarm to DTMF tone module for Motorola Quantar radios. (Added April 12 2009)
Motorola CEB-ACIM programming cable Drawing for a programing cable from a PC to a Motorola CEB ACIM card (Added April 19 , 2009)
Duelo Serial Puck to D700 Radio
Interface from a Duelo GPS serial puck to Kenwood D700 radio for APRS
(Added April 19 2009)
DTMF to Relay Closure Generates relay closures from DTMF tones. Has lots of remote control applications. (Added April 12, 2009)
Serial Connections Notes on 25 pin and 9
pin serial connections, 9 pin to RJ45 adapters.(Added April 21)
Diode Block Box Isolation diode box
between the car and an extra battery. Stops extra battery from
backfeeding the car.
My original attempt at this failed mechanically. This version is very solid.
Austron RS20A Redraw of schematic for
an Austron RS20 Power Supply. (Added April 19, 2009)
WiiFit Balance Board Riser. This is the
drawing for a riser platform for the Wii Fit. Made for WB9ZPH
Computer Hutch for Texas Tech Dorm Student Desk.
In memory of J. Frank Smith WA4QAB who went silent key in June 2000. A friend, a mentor and a buddy who helped me through rough times after the death of my first wife.
73 and GL WA4QAB
Have a commment or want to share an idea or a project. Please sign my guestbook and tell me about it. 73's Gerry