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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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TELEPHONE ACCESSORIES xx TELEPHONE Super Hold: a telephone peripheral. Allows a hold function on any touch-tone phone and has provisions for music during the hold. Hold circuit lets you replace the receiver on one telephone and pick up another extension without breaking the connection. Automatic muting. System design ideas for muting the stereo when the telephone rings. Phone-activated audio-muting circuit will automatically silence your stereo or TV as soon as the telephone rings. Est. cost: $20 (kit). Voice-mail alert. A flashing LED indicates that your telephone has rung while you were out and you should check for any voice-mail messages. A $10 phone patch. Telephone patch for connecting a CB transceiver to your telephone. CB phone patch. Simple phone patch for ham radio operators. Telephone cost meter. Keep tabs on phone costs with this 8085-based phone meter. Displays the minute-by-minute charge of each phone call as it accrues. Displays the time when not in use. Call counter records the number of calls received on a telephone. Used along with an answering machine, it will show you how many people did not leave a message. Phone Troll. Build a telephone-usage monitor and controller. Keep a running record of every telephone call placed or received. Control other devices with a telephone call. Works in connection with the game port on your PC. Est. cost: $27 (kit). Attachments to your phone. What is available and what are the requirements. Simple circuit attached to a telephone line will cause a busy signal if the temperature falls below preset temperature. Hands-free telephone adapter. Desktop microphone and stereo earphones replace the telephone handset. Est. cost: $30. Put your telephone on hold. Push button disconnects the handset while maintaining the telephone connection. An LED indicates when the circuit is in use. Est. cost: $5. Telephone projects for the hobbyist. (1) Tele-Guard allows you to detect a listening device (bug) or an open telephone extension. (2) Telephone hold button. (3) Telephone melody ringer. Circuits for use with your telephone. (1) Replace the ringer with a blinking 117-VAC lamp. (2) Line-activated solid-state switch activates a control or external circuit each time a phone on the same line is taken off-hook. (3) In-use indicator lights an LED. (4) "Tap" to amplify or record a telephone call. Telephone "Shaddap" circuit gives a busy indication to all incoming calls until pressing a reset switch puts the phone back in service. An LED shows when it is working. Replace your telephone handset with headphones equipped with a microphone for hands-free talking on the phone. Electrical lock for your telephone. Two or more rotary switches are wired in parallel. The switches must be set to the correct numbers for the telephone to accept outgoing calls. An automatic phone disconnector. Electronic circuit disconnects a telephone when the lights are turned off, while simulating a telephone that's ringing instead of a busy signal. Ideal for use in a bedroom. Ten-minute call monitor. Installing this accessory between your telephone and the incoming line automatically limits calls to 10 minutes in duration. A tone is sounded on phone when only 60-seconds remain. Off-hook phone alert sound an audible signal (howler) for 50 seconds and then suspends service on the line. Est. cost: $15. Phone miser. Lock-out for unauthorized long-distance telephone calls. Automatically locks out any call whose number begins with the numeral 1 and any attempt to dial the operator. Will not work with rotary-type dialers. Telephone minder tells you if someone called when you were not at home. Phone-line "busy" indicator. Self-powered circuit connects across telephone line and lights an LED to signal when a modem is on-line or a telephone instrument is off-hook. Telephone extension lockout device will automatically disable one or more extension phones when the line is in use. Telephone extension busy warning indicator will light an LED whenever the line is in use. Automatic telephone hold device lets you change telephones without hanging up on the caller. Put your telephone on hold with this low-cost add-on circuit that gives any phone instrument a "hold" feature. Dual-application telephone security system. Part 2. DTMF decoder and logger will keep track of phone numbers that were called from your home or decode the tones you hear in broadcasts. Stores the last 240 characters decoded for display on the LCD. Est. cost: $27 (kit). Device set under a desk telephone will turn on a red light if the telephone should ring while you were away. A reset button turns off the light. Installing a phone patch on a CB set. Build a telephone status monitor. Automatically turns on an indicator lamp at every extension whenever any phone on that line is in use. Est. cost: $30. Telephone bill reducer simply emits audible clicks on a timed basis. Extension silencer circuit is placed in series with each of your extension phones. All phones will ring normally, but the first one to answer locks out the other telephones. Telephone toll totalizer. Battery-powered timer lets you keep track of how long you talk by long-distance telephone and the approximate cost of each call. Two circuits which light an LED to show that the telephone rang while you were away. Telephone circuit parade. (1) Neon lamp acts as a ring indicator. (2) Telephone recording control will activate a tape recorder any time the phone is taken off hook. (3) Telephone indicator (tester) will tell when a phone is off hook, the dialing method used, and which digit was pressed or dialed. Tel-Tale. Build a device which flashes an LED to indicate that you should check your telephone voice-mail service for messages. Phone Pager. Connected to the telephone line, this device beeps and displays a code number when activated. Use it to non-verbally notify others of phone calls, dinner, business meetings, etc. A standard touch-tone phone acts as the sending device. Est. cost: $49 (kit). Build a DTMF decoder/logger. It can decode all 16 DTMF tones that are used by a standard touch-tone telephone, and automatically keep track of the last 240 characters entered. Circuit to mute a stereo sound system whenever the telephone rings or the doorbell is activated. Build the telephone hangup module. Pressing a button delivers a message saying in part "... this telephone number does not accept calls of this nature ..." and then disconnects the line. Sentinel. Build this early-warning addition to your existing telephone-dependent home alarm system. This device monitors the telephone line and sounds an alarm should the line go dead. New tricks for your old PC. Some tips on using an older machine in a telephone or home automation application. Electronic call timer for your telephone sounds an audible alarm after a three minute telephone conversation. Time interval may be varied. Build Digi-Toll. Part 1. A digital timekeeping accessory that displays the time of day and the elapsed time spent on long distance calls. The unit is not attached to phone. Using it to time your calls can result in savings on toll charges. Est. cost: $50. Build Digi-Toll. Part 2. Telephone toll totalizer program. Written in Radio Shack TRS-80 BASIC. Video display will show your toll charge for a long distance call as you are making the call. Starting the computer as soon as the person you call answers the phone will synchronize the program. There is no physical connection to the telephone. Music-on-hold telephone accessory. Allows you to hang up the phone in one room at pick it up in another room without losing the connection. The caller is treated to music while you are between phones. Est. cost: $10. Build this conference call telephone accessory. Requires two separate phone lines (two different telephone numbers). Estimated cost: $5. Build this telephone in-use monitor to eliminate unintentional eavesdropping by indicating when a phone line's in use. Requires attachment to line. "No Wrong Numbers" telephone accessory will allow only callers with the "secret code" to get through to ring your telephone. Part 1. Est. cost: $60. "No Wrong Numbers" telephone accessory will allow only callers with the "secret code" to get through to ring your telephone. Part 2. "No Wrong Numbers" telephone accessory will allow only callers with the "secret code" to get through to ring your telephone. Part 3. Build this "tele-toll timer" to tell you how much time is spent on each phone call. Telephone off-hook alarm. A lamp lights whenever receiver is removed from cradle or line goes dead. A buzzer sounds after the phone has been off the hook for a preset period. Off-hook indicator circuit uses only a single NAND gate. Typical data-access arrangement circuits to get modem tones or other audio or control signals onto or off of the telephone lines. Digital (electronic) combination lock prevents unauthorized use of a telephone. Part 1. Digital (electronic) combination lock prevents unauthorized use of a telephone. Part 2. Using a bridge rectifier to automatically provide the correct polarity for telephone accessories powered from the telephone line. Music-on-hold adapter for a telephone. Includes an explanation of how hold buttons and "Touch-Tone" phones work. Fax Mate allows both fax and voice communication on a single phone line. This switch box prevents an auto-answer fax from answering the telephone. However, once a human determines that the incoming message is a fax, it will "ring-up" the fax machine, connect and transmit the incoming data, and then "hang-up" the fax machine. Est. cost: $53. Telephone-activated audio-muting circuit will automatically silence your stereo or TV as soon as your telephone rings. Requires a direct connection to the telephone line. Est. cost: $30. Telephone line controller. Microprocessor-controlled device that can selectively restrict incoming or outgoing calls, dial an array of numbers, and record time, date and duration of all phone calls. Est. cost: $200. Digi-Call (Digital Call Auto-Logger). An intelligent phone-line monitor lets you log telephone, modem and fax usage automatically. This microprocessor-based unit can record more than 1500 calls without user intervention. Est. cost: $170 (kit). Part 1. Circuit theory. Digi-Call (Digital Call Auto-Logger). Part 2. Construction. Duo-Phone circuit allows one telephone to be used on either of two telephone lines. Also allows conference calls between three parties on the two lines. Make a phone directory for frequently called numbers from a wooden shutter. | |||||||||
Copyright © by Norman Lathrop Enterprises. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means (electronic, mechanical, print photocopying, recording or otherwise) without the prior expressed permission of Norman Lathrop Enterprises, except as permitted by law. |
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