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Telephone Ringer Schematics

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Ringing Phone Light Flasher

Ringing Phone Light Flasher

when the phone rings light flashes.

http://www.aaroncake.net/circuits/pflash.htm

Telephone ringing circuits

Telephone ringing circuits

http://www.tkk.fi/Misc/Electronics/circuits/telephone_ringer.html

Telephony Dialing and Signaling Tones

Telephony Dialing and Signaling Tones

http://www.elexp.com/t_tele.htm

What is Ringer Equivalence?

What is Ringer Equivalence?

http://www.epl.co.uk/info13.htm#What

Phone Hold With Music

Phone Hold With Music

http://home.maine.rr.com/randylinscott/jul98.htm

Low cost intercom using transistors

Low cost intercom using transistors

comprises a 3-stage resistor-capacitor coupled amplifier. The complete circuit, along with microphone and earpiece etc, can be housed inside the plastic body of a cellphone toy

http://www.electronic-circuits-diagrams.com/audioimages/audiockt2.shtml