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Electronic circuits


Telephony
Telephone devices and addons to them
  • A simple second ring for telephone

  • A telephone answering device

  • Amplifier for phone

  • Anti ADN

  • Autoresponder, that tells time

  • Battery charger for mobile phones Nokia

  • Calling devices for telephones

  • Deception ATS

  • Diode-dividing prefix for phone

  • Free telephone beetween cities (based on 15 impulses)

  • Identification number from parallel phone

  • Indicator busy phone line

  • Indicator lines busy

  • Listening to the conversation

  • Locker and phone line indicator

  • Locking "pirate" phone

  • Micro FM transmitter for the telephone

  • Multifunction device phone control

  • Phone-nofelet

  • Protecting device ADN

  • Protecting imported telephone sets

  • Protecting telephone line

  • Radio phone from the telephone

  • Second ring for phone

  • Telephone Adapters for recording information

  • Telephone devices for two or more subscribers

  • The device retention telephone line

  • The wireless remote calling device

    Total 28 pages


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