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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 RINGER x RINGER (TELEPHONE) xx TELEPHONE Telephone ring-detection circuit is useful for detection of high-voltage signals and conversion to common logic levels. A musical telephone bell. Personalize the sound of your telephone ring by using a chip which plays 25 different tunes. Est. cost: $49. Circuit will signal the arrival of a phone call by sensing the voltage drop across the phone line. Use for remote signaling or to "hear" incoming calls before the phone rings. Circuit for three telephone accessories: (1) simple "ring" indicator (2) relay operated "ring" indicator (3) privacy switch. Phone sentry. Defend yourself from nusiance calls with this call screener. Allows you to set a minimum number of times that a telephone caller must let the phone ring before the incoming call actually rings the telephone. Est. cost: $30. Telephone ring converter alters the sound of a phone so you can distinguish between multiple phones. Also can be used as a remote ringer (annunciator). Telephone bell extension. Talking telephone ringer. Replace a ringing with a personalized message, music, or other sounds. Programming can change the audio for each successive ring (up to 5). Amplifier circuit to boost ring level of a telephone bell. Build this distinctive ring decoder which allows the phone company to assign up to four different phone numbers to a single line. Ring-A-Thing. A loud doorbell, powered by rechargeable batteries, will sound a loud ring at a remote location whenever the telephone rings. Involves connecting two wires to the telephone line. Simplex-a-thing. Remote signaling device alerts you to incoming phone calls by means of a buzzer or blinking light. Unit is not wired into phone circuit. Tone-ringer. Replace the standard telephone ringer with this pleasing two-tone warble caller. May also be used in a remote location. Musical ringer. Telephone ringer replaces the standard ringer with your choice (switch selectable) of 26 popular melodies. Extension (remote) telephone ringer. 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. Circuit for a sound-operated switch that will sense the ringing of a telephone and translate this to a flashing lamp. Circuit to cause a lamp to flash whenever the telephone rings. Circuit for an electronic telephone ringer has three sound levels. Phone Sentry allows the user to program the number of rings an incoming call must generate before your telephone is allowed to ring. Est. cost: $24. Telephone alarm sounds a remote bell or horn to let you know the phone is ringing. Est. cost: $9. Circuit to provide for remote ringing of a bell as soon as the circuit is activated by an incoming call. Also can eliminate the occasional non-ringing of the telephone itself. Est. cost: $9. Mello-Phone: The super musical telephone ringer. Build-it-yourself project substitutes up to 200 selectable musical tunes of extended length for a standard telephone ringer. Est. cost: $44. Automatic telephone ringer silencer is activated when the room lights go off and turns back on when the lights go on. Ideal for a bedroom telephone. Solid-state telephone bell replacement and stand-alone incoming-call annunciator. Automatic telephone flasher. Add-on accessory gives you a visual indication of an incoming telephone call. Telephone ringer circuits built around Motorola's MC34012 family of tone-ringer ICs. Wireless remote ringer. Works with an FM radio to remotely signal when your telephone rings. Phone-ring visual indicator. Lighting up a lamp when a phone call comes in is helpful for hearing-impaired, bedrooms, etc. High-tech telephone ringer sounds a more attention-getting, yet pleasant-sounding British-style phone signaling sequence. Yuletide telephone ringer. Simple add-on device sounds "Deck the Halls" to signal an incoming call. The fone sentry. Prevents your telephone from ringing for a preselected number of times (4 to 10) so that you will not be disturbed while sleeping. Fone mate. This computerized telephone accessory provides hold, recall, warble-tone ringing, 12- or 24-hour clock display and dialed-digit display function. Super tunes for telephones. Device gives your phone more answering appeal by playing a different melody (from a selection of 12) each time it rings. Circuit will be activated by either a telephone pickup or a dynamic microphone. It will turn on a light in response to a noise (like a telephone or alarm clock ringing). Useful for people with hearing disabilities. Low-cost solid-state electronic ringer circuits can replace the electromechanical ringer in a telephone. Est. cost: $25. Melodic telephone ringer. Design your own pleasant tune to replace the standard ring. Requires a direct connection to the telephone line. Add a distinctive extension tone ringer to your telephone line. Est. cost: $12. Ringer relay is designed to flash a lamp (or other signaling device) in cadence with a telephone's in-coming ring signal. Replace a telephone bell with a light by using this home-made optocoupler (optoisolator) to separate the telephone from the light circuit. Phone flasher circuit will flash a light when your phone rings. Phone-ring detector circuit allows you to change the number of rings that activates some device. Remote ringer in a central location overcomes the problem of exceeding REN (ringer equivalency number) because of too many extension telephones. Telephone ring converter alters the ringing sound of a telephone so you can distinguish it from any other phone in the same room. 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. Telephone circuits. (1) Circuit uses a light-dependent resistor to sense when a phone with a built-in flasher is ringing. (2) Two circuits will tell others when a telephone line is in use by lighting an LED. (3) Two circuits sense when a phone rings and activates a loud fire bell. (4) Extension ringer sounds a bell in a remote location. Circuit for a telephone ring indicator which will drive a buzzer, light an LED, etc. Circuit for a remote telephone alarm sounds a buzzer or Sonalert audible signal device whenever the telephone rings. 20-Hz generator circuit to test the ringer on old telephones. Circuit to detect the ringing of a telephone and turn on an LED. Plug-in remote ringer. Use your house wiring to send a signal to a remote ringing device whenever the phone rings. Circuit for a remote telephone ringer. Use it to trigger a bell or a light. Telephone ringer IC examined. Circuit for a musical telephone ringer which will play one of 28 tunes (as selected by the user). Incorporates General Instruments' AY-3-1350 melody-synthesizer IC powered by a 9-volt battery. Circuits for a telephone-ring detector that is used to light an LED, power an optocoupler, or power a piezotransducer. Explanation of ringer-equivalency number, plus a telephone ring detector which uses an optocoupler for safety isolation. Circuit of an electronic warbling telephone ringer to substitute for the conventional bell. Circuit for a dedicated telephone ringer that can be powered by the phone line or a battery. Add a flashing light to your telephone bell. Telechirp. Remote telephone ringer produces a low level chirp or warble instead of a clang or bong. Build and install an inexpensive remote telephone bell. | |||||||||
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