/Schematics/Telephone circuits

Title Short description Rate Download
Telephone answering machine Telephone answering machine. 2.95 1,748
LED monitor for phone line Turns LED ON when phone line is in use. 2.95 1,323
Telephone hold with music Keeps phone line open and plays audio signal on it. 2.94 1,073
Phone line in use indicator Very simple device with two LEDs as indicators. 2.93 1,063
Telephone line recorder v4 A device that turns-on voice recorder automatically and taps to the phone line. 2.93 1,904
Telephone line status Another device for telephone line status indication. 2.92 1,197
Telephone line guardian v2 Turns on alarm if phone line is in use. 2.92 812
UPS for cordless phones Backup power supply for cordless phones base station. 2.92 1,698
Caller ID with 7-seg display DTMF Caller ID, not FSK but DTMF. 2.92 2,359
Telephone line guardian v1 Turns alarm on if phone line is in use. 2.91 993
Smart telephone light Turns on lights when phone rings and if in dark. 2.91 2,138
Phone ring generator v1 Generates voltage across phone line in order for phone to ring. Works on 12V. 2.91 1,051
Telephone ringer Audio and visual telephone ringer. 2.90 1,494
LED-blink monitor for phone line Blinks LED while phone line is in use. 2.90 1,158
Telephone line recorder v1 A device that turns-on voice recorder automatically and taps to the phone line. 2.90 3,344

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