Index of /files/Radio & Communications/Telephones & Accessories/Circuits/
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Acoustic Protector Damps Telephone-Line Transie..> 01-Nov-2022 12:50 460K
Add Speakerphone Function to a Landline Phone.pdf 12-Nov-2022 05:58 398K
Add a Distinctive Ring to your Phone.pdf 01-Nov-2022 12:50 78K
All About Telephones and How to Repair Them Par..> 13-Jul-2023 02:12 431K
Answer Mate Errata ME 1988.pdf 15-Aug-2023 04:23 94K
Automatic 4 Line Telephone Selector.pdf 01-Nov-2022 12:50 2M
Automatic Hold Device Errata ME 1989-02.pdf 01-Nov-2022 12:50 134K
Automatic Phone Disconnector.pdf 06-Apr-2022 05:41 103K
Call Director.pdf 01-Nov-2022 12:50 2M
Caller ID Tech Info.pdf 01-Nov-2022 12:50 540K
Cordless Phone Supposed Hazards.pdf 01-Nov-2022 12:50 234K
DTMF DECODING & DISPLAY.pdf 15-Aug-2021 03:18 53K
DTMF Phone Pad.pdf 01-Nov-2022 12:50 2M
Distinctive Ring Decoder.pdf 01-Nov-2022 12:50 910K
Dual- Application Telephone Security System Par..> 01-Nov-2022 12:50 126K
Electronic Ringer for Telephone Lines.pdf 01-Nov-2022 12:50 226K
Experimenting with a Touch -Tone DTMF Receiver.pdf 20-Jun-2023 04:15 175K
Home Intercom Using Analog Telephones.pdf 01-Nov-2022 12:50 1M
How Landline Telephones Work.pdf 01-Feb-2022 05:15 3M
ISDN Prototyping Telephone.pdf 21-Nov-2021 06:17 1M
Inside The Telephone.pdf 01-Nov-2022 12:50 812K
Isolated Phone Line Status Indicator.pdf 01-Nov-2022 12:50 734K
Isolated indicator signals telephone line's sta..> 11-Nov-2023 00:14 99K
Isolating Telephone Extensions.pdf 01-Nov-2022 12:50 3M
Landline phone patch for Ham radio rig ETI734.pdf 06-Sep-2023 04:12 4M
Losses In Early Telephone Lines.PDF 01-Nov-2022 12:50 17K
Make a Phone Ring to a Simple Tune.pdf 01-Nov-2022 12:50 219K
Music On Hold Adapter.pdf 01-Nov-2022 12:50 2M
Music On Hold Box.pdf 01-Nov-2022 12:50 4M
Music On Hold Telephone Accessory.pdf 01-Nov-2022 12:50 1M
Music on hold Adapter for Analog Telephone Line..> 01-Nov-2022 12:50 479K
Musical Telephone Ringer.pdf 01-Nov-2022 12:50 560K
No Wrong Numbers Telephone Accessory Part 2 RE ..> 01-Nov-2022 12:50 1M
Off-Hook Phone Alert.pdf 06-Apr-2023 01:54 358K
Optically Coupled Phone Ringer.pdf 01-Nov-2022 12:50 82K
Opto Isolator Circuit Shows Phone Line Status.pdf 01-Nov-2022 12:50 85K
Phone Activated Audio Muting Circuit.pdf 01-Nov-2022 12:50 806K
Phone Activated Night Light.pdf 01-Nov-2022 12:50 492K
Phone Beeper for Recording Calls.pdf 01-Nov-2022 12:50 909K
Phone Hold with Music.gif 01-Nov-2022 12:50 5266
Phone Line 'Busy' Indicator Errata ME 1988-10.pdf 01-Nov-2022 12:50 141K
Phone Line Monitor.pdf 01-Nov-2022 12:50 211K
Phone Line Sentinel.pdf 01-Nov-2022 12:50 197K
Phone Line Simulator.pdf 01-Nov-2022 12:50 2M
Phone Lock.pdf 01-Nov-2022 12:50 622K
Phone Minder.pdf 01-Nov-2022 12:50 1M
Phone Miser for older Analog Phone Systems.pdf 30-Sep-2023 02:03 329K
Phone Pager.pdf 01-Nov-2022 12:50 2M
Phone Ring Visual Indicator for Landline Phones..> 16-Nov-2022 23:40 179K
Phone Sentry.pdf 01-Nov-2022 12:50 954K
Phone Status Indicator.gif 01-Nov-2022 12:50 6738
Phone Status Light.pdf 01-Nov-2022 12:50 10K
Plug-In Remote Ringer.pdf 01-Nov-2022 12:50 1M
Protect the Calling Bell and Ears Too.pdf 16-Oct-2023 01:21 62K
Put Your Telephone On Hold Errata ME 1989-05.pdf 01-Nov-2022 12:50 58K
Recreating Sound.pdf 01-Nov-2022 12:50 123K
Remote Telephone Ear - Listen via Long Distance..> 01-Nov-2022 12:50 827K
Remote Telephone RInger.pdf 01-Nov-2022 12:50 271K
Ringing Phone Light Flash.pdf 01-Nov-2022 12:50 48K
SUCTION CUP PHONE PICKUP.pdf 15-Aug-2021 03:17 24K
Selectacall ETI-723 ETI 1982-02 Errata.pdf 12-Jun-2023 17:50 968K
Selectacall Errata ETI-723 1982-02.pdf 23-Nov-2022 00:13 968K
Super Hold tor Telephone.pdf 01-Nov-2022 12:50 1M
Telco In A Box.pdf 01-Nov-2022 12:50 445K
Telco Line Problems.pdf 01-Nov-2022 12:50 170K
Tele-Toll Timer.pdf 01-Nov-2022 12:50 2M
Teleconferencing System.pdf 01-Nov-2022 12:50 154K
Teleguard.pdf 30-Jan-2022 04:41 420K
Telephone Add On Devices.pdf 01-Nov-2022 12:50 247K
Telephone Amplifier.pdf 01-Nov-2022 12:50 974K
Telephone Audio Interface.pdf 01-Nov-2022 12:50 1M
Telephone Bell Extender (2).pdf 01-Nov-2022 12:50 1M
Telephone Bell Extender.pdf 01-Nov-2022 12:50 125K
Telephone Bell.pdf 12-Jul-2021 23:19 271K
Telephone Call Recording Adapter.pdf 01-Nov-2022 12:50 50K
Telephone Call Restrictor (2).pdf 01-Nov-2022 12:50 401K
Telephone Call Restrictor.pdf 01-Nov-2022 12:50 1011K
Telephone Call Screener.pdf 01-Nov-2022 12:50 4M
Telephone Call Timer.pdf 01-Nov-2022 12:50 940K
Telephone Dialer Vocalizer.pdf 01-Nov-2022 12:50 436K
Telephone Eavesdropper.pdf 21-Oct-2022 02:26 349K
Telephone Exchange.pdf 27-Apr-2023 02:06 1M
Telephone Flasher (2).pdf 01-Feb-2022 04:59 234K
Telephone Flasher.pdf 01-Nov-2022 12:50 448K
Telephone Hold Button.pdf 01-Nov-2022 12:50 534K
Telephone Hold Fearure for Land-Lines.pdf 02-Nov-2023 20:43 194K
Telephone In Use Monitor Errata.pdf 01-Nov-2022 12:50 14K
Telephone Line Controller.pdf 01-Nov-2022 12:50 3M
Telephone Line Grabber.pdf 01-Nov-2022 12:50 698K
Telephone Line Interface.pdf 01-Nov-2022 12:50 51K
Telephone Line Simulator.pdf 01-Nov-2022 12:50 1M
Telephone Line Tester.pdf 01-Nov-2022 12:50 303K
Telephone Minder for Analog Landline Phones.pdf 01-Aug-2023 01:40 392K
Telephone Operated Remote Power Switch.pdf 01-Nov-2022 12:50 5M
Telephone Pickup for Dial Phones.pdf 01-Nov-2022 12:50 958K
Telephone Quality Assessments.pdf 16-Nov-2023 22:17 948K
Telephone Record-Play Accesory.pdf 01-Nov-2022 12:50 246K
Telephone Recording Adapter.pdf 01-Nov-2022 12:50 1M
Telephone Ring Detector.pdf 01-Nov-2022 12:50 89K
Telephone Ringing and Speech Circuit.pdf 01-Nov-2022 12:50 214K
Telephone Scrambler.pdf 01-Nov-2022 12:50 5M
Telephone Status Monitor.pdf 01-Nov-2022 12:50 224K
Telephone Technology Conclusion - Landlines ME ..> 09-Aug-2023 03:05 336K
Telephone Technology Part 1 ME 1988-08 - Landli..> 08-Apr-2023 02:42 506K
Telephone Tester Detects Line Distortion.pdf 01-Nov-2022 12:50 437K
Telephone Tester Errata ME 1988-10.pdf 14-Jul-2023 04:15 46K
Telephone Usage Monitor and Controller.pdf 01-Nov-2022 12:50 4M
Telephone-Related Ascii Schematics.pdf 01-Nov-2022 12:50 40K
Telephones & Their Repair Part 1 ME1986-03.pdf 09-Nov-2022 05:24 270K
Telephones and Their Repair Part 1 ME 1986-03.pdf 07-Apr-2023 20:24 270K
The Life of a Phone Hacker.pdf 01-Nov-2022 12:50 251K
The Party Line Phone Line Simulator.pdf 01-Nov-2022 12:50 1M
The Phone Sentry.pdf 01-Nov-2022 12:50 565K
The Teleguard Auto Dialer Part 2 Conclusion ME ..> 26-Sep-2023 03:04 157K
Tone RInger for Classic Phones.pdf 13-Oct-2022 02:18 290K
Turn On Appliances Via Long Distance.pdf 01-Nov-2022 12:50 2M
Two-Line Telephone Answering Machine Interface ..> 14-Dec-2022 01:27 107K
Wireless Remote Telephone Ringer.pdf 08-Apr-2023 02:46 268K