Issue
156 July 2003
Stealth
Telephone Screener
Mad
Dash for Flash Cash Grand Prize Winner
SOURCES
AND PDF
Download
the PDF of this article.
Richard
Wotiz earned a B.S.E. in Electrical Engineering and
Computer Science at Princeton University. He runs his
own hardware consulting business that specializes in
consumer products and toys. You may reach Richard at
dick601@mystics.org.
PROJECT
FILES
To
download the code, go to ftp.circuitcellar.com/pub/Circuit_Cellar/2003/156.
REFERENCE
[1]
R. Richey, “Adaptive Differential Pulse Code Modulation
Using PICmicro Microcontrollers,” AN643, Microchip,
1997.
RESOURCES
Telecommunications
Industry Association, “Technical Require-ments for Connection
of Terminal Equipment to the Telephone Network,” TIA-968-A,
2002.
Underwriters
Laboratories, Inc., “Standard for Information Technology
Equipment, Including Electrical Business Equipment,”
UL 1950, 3d ed., 1995 (revised 2001).
SOURCES
TIA-968-A
Standard
ACTA
www.part68.org/documents.cfm
UL
Standards
COMM
2000 (distributor)
www.comm-2000.com
MCP6022,
MPASM 3.20, PIC16F872, 24LC128
Microchip Technology, Inc.
www.microchip.com
220003
Surge-withstand fuse
Littelfuse,
Inc.
www.littelfuse.com
