Kits

The kits listed here come with everything needed to assemble a working unit. Unless specifically stated the kits do not include a case to house the project. In some cases an optional case is available and will be mentioned in the description. Any parts that are not included in a kit will be mentioned in the description.
The CALLER ALERT is useful for a call screener that does not depend on caller ID information. It allows you to turn off the ringer on your telephones, yet still allows authorized callers to get through to you. The caller enters a Touch-tone code that activates a tone alert signal. All other calls are sent to the answering machine. See article on the Articles page for more details.
Kit includes parts for both high and low output option but does not include volume control or case.
Call Alert $28.50
The DIGITAL TIMER is useful for controlling AC power loads with timing cycles that range from 2 seconds to 99 minutes. An inexpensive digital kitchen timer is used as an interface to the kit. See article on the Articles page for more details.
Kit does not include case or digital timer.
Digital Timer $18.00
The DTMF Plus allows you to capture touchtone signals from your telephone line or from the speaker of a radio. It then converts the tones to an RS-232 signal that can be read by any computer. See article on the Articles page for more details.
Kit does not include case or RS-232 cable
DTMF Plus $32.00
ATC Electronics, Inc.