TELEPHONE RELATED PLANS
Please Note: Plans do not include any parts!!!
PLAN 2003 - TEENAGE TELEPHONE ALARM
Limit those teenage telephone calls. This solid state device attaches to the telephone line. It emits a single warning tone at the end of 8 minutes of conversation and gives a continuous tone at the end of 10 minutes. The continuous tone prevents further conversation.
PLAN 2005 - DIALED DIGIT DISPLAY
An all IC device which displays the digits of any telephone number dialed. Reduce wrong number dialing. Makes a fascinating project.
PLAN 2008 - TELEPHONE MEMORY DIALER
These plans show how to construct a push-button telephone dialer attachment using only 3 IC's; and which has the capacity to store 32 8-digit phone numbers. Numbers are automatically dialed by pushing only 2 buttons. The unit can be attached to any type of telephone: push-button or rotary dial. Options are shown for either tone or pulse output, and for LED display of the number being dialed. The unit also features one-button re-dial of the last number called. Compares to units costing over $100.00.
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484 Lakepark Ave, Suite 59, Oakland,CA 94610