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Simple Ring Modulator - Since there seems to have been a lot of discussion about
ring modulators recently, I thought I would take the time and create an ASCII
schematic of the Digisound 80 ring modulator which is based on the MC1496 balanced
modulator....(circuit added 06/07/08) |
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Simple Telephone Ring Tone Generator - (electronic Circuit / Schematic added
10/04) |
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Telephone Number Display wlwectronicsworld - The given circuit, when connected in
parallel to a telephone, dis- plays the number dialled from the telephone set using
the DTMF mode. This circuit can also show the number dialled from the phone of the
called party...(added 5/02) |
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Telephone Ring Generator using 60Hz Power Transformer - This ring generator will
ring a telephone once every 10 seconds. The interval between rings can be lengthened
or shortened by varying the value of the 1 Meg resistor. The 70 volt/ 30 Hz ring
voltage is produced from the 120 volt side of a small 12.6 VAC power transformer
....(circuit / design added 8/03) |
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Telephone Ringer using 555 Dual Timers - Using modulated rectangular waves of
different time periods, The circuit presented here produces ringing tones similar to
those produced by a telephone. The circuit requires four astable multivibrators for
its working. Therefore two 556 ICs are used here. The IC 556 contains two timers
(similar to 555 ICs) in a single package. One can also assemble.... (added
10/05) |
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Telephone Ringer using Timer ICs - (electronic Circuit / Schematic added 10/04) |
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Telephone Ringing Circuits - how to detect ringing and how to make phones ring
(added 5/02) |
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Telephone Ring-Tone Generation - DN134 Design Notes (Linear Technology) (app
note added 2/06) |
