Ringers
| Circuit phone ringer | Description |
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By placing a circuit in series with the telephone, you can customize a phone ringer without modifying the phone |
| Audio/Visual ringer | Circuit indicates telephone ring and require no extra power source. |
| Cellular phone call detector | Lights up a led when a cellular phone rings, simple 555 based circuit. |
| Telephone ringer | |
| Telephone ring tone generator | Produces simulated telephone ring tone and based on CD4060 |
| Telephone on use indicator and ringer | Contains circuit for both telephone on use indicator and telephone ringer. |
| Melodious Telephone Ringer | Telephone ringer based on melody IC UM66 |
| Telephone ringer using timer IC | |
| Telephone ring generator using switching supply | The circuit generates high voltage required for sing from a switching power supply. |
| Ringing Phone Flasher | Flashes high wattage bulb when telephone ring. |
| Telephone ringer using dual 556 dual timer | Using modulated rectangular waves of different time periods, The circuit produces ringing tones similar to those produced by a telephone. |