Selectone ST-907 Programmer Board

I had a request by E-Mail to help a fellow HAM operator get info or a schematic on the no longer supported Selecton Model ST-907 programmer board for DTMF and ANI Tone Encoder boards. Selectone no longer has any info on it, so I made up a schematic.






Parts List, From Left to Right.
36 Pin Parallel Printer Connector
9v Battery Clip
13 Pin programming connector for Selectone boards
Zenier Diode
10K 5% 1/4w Resistor
10K 5% 1/4w Resistor
100K 5% 1/4w Resistor
Zenier Diode
47K 5% 1/4w Resistor
47K 5% 1/4w Resistor
2N4401 Transistor
47K 5% 1/4w Resistor
10K 5% 1/4w Resistor
2N3906 Transistor
10K 5% 1/4w Resistor



All the pins #19-36 are connected to ground/neg.
12 holes are provided on the bottom of board for prototyping, testing or direct wiring.

My schematic isnt 100% exactly the same on the trace locations, and its not to scale, but the original board used a double sided traces, so I had to modify it a little bit for one sided viewing, so it wouldnt get confused, as some traces were too close or overlapped on top and bottom. I did try to get it as close as possible tho.


Software for the ST-907 board can still be found on the Selectone website.
http://www.com-spec.com/selectone/download/st_confg.zip


I made the schematic using a cool program called ExpressSCH. You can built schematics and have a company make PCB boards for you for a reasonable price, if you wish.
The software can be found below for FREE!
http://www.expresspcb.com/ExpressPCBHtm/Free_schematic_software.htm

Here is my file for the Selectone ST-907 Board.
http://www.mark-rodgers.com/Project%20Pics/Selectone%20ST-907.sch

Please let me know if you have trouble downloading the file.