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CircuitsRadio, a resource for engineers, hobbyists, inventors & consultants, is a collection of 12,000+ electronic circuits or electronic schematics cross-referenced into 500+ categories to find quick solutions for electronic design problems. Bad links are removed and new circuits or schematics are added frequently. This site contains lots of FREE electronic circuits (schematics) & do-it-yourself (DIY) circuit diagrams for hobbyists, students, professionals etc. covering a wide range of categories in electronics like audio, music,home/garden related,computer hardware,radio,robotics etc to name a few. There are also links to sites that offer hobby electronic kits and other electronics hobby related stuff. Use the menu on the left to browse different circuit categories. OVER 10.000 SCHEMATICS & DIAGRAMS (Catalogue of Electronic Circuits)   Search scheme:    OR AND Example: Infrared control system       To search in all categoriesAntiqueAudioAutoAuto AudioCamcordersCellular communicationComputerData processingDigital/MicrocontrollersDomesticFiltersGames/EntertainmentsHigh VoltageInterfacesLight/Laser/IRMedicineMetersMiscellaneousMotor controlsMusicNetworksOscillatorsPDA interface and schematicPower SuplyPreamplifiersRadioRC ModelingRepairSecuritySolar energySwitchingTelephoneTransmittersTV/MonitorsVideo   Electronic schematics: Telephone (Found: 435)   Telephone:   411. TELEPHONE OFF-HOOK INDICATOR. This circuit provides a steady logical "high" indication when the telephone is off its hook. [ File in a format rar ] Source: Art's Theremin Page 412. TELEPHONE OFF-HOOK TONE GENERATOR. This circuit generates the sound that many telephone companies use to attract the customer's attention to their phone when they leave it "off hook." It is also refered to, in telephony jargon, as "ROH," for "receiver off-hook." [ File in a format rar ] Source: Art's Theremin Page 413. Telephone privacy adapter Source: http://www.hut.fi/ 414. Telephone privacy adapter Source: http://www.epanorama.net/ 415. Telephone privacy adapter Source: Tomi Engdahl's Electronics Pages 416. Telephone Recorder Source: http://www.aaroncake.net/ 417. Telephone Recorder Source: Aarons Homepage 418. Telephone recording circuit Source: http://circuitos.tripod.cl/ 419. Telephone recording circuit Source: CircuitoZ 420. Telephone ring controlled relay Source: http://www.designnotes.com/ Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 Datasheet catalog Repair Schematics Developers Books Palm software chinovnikam.net

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