Editing Cellular Rotary Phone

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===Bell Ringer===
 
===Bell Ringer===
 
[[Image:Rotary-Ringer.jpg]]
 
 
 
The ringer circuit must use the 3.7VDC nominal from the battery and output ~80VAC to get the coil to kick the hammer between the two gongs. Tricky to say the least. Pete Dokter (mad genious) used a basic DC-to-DC step up IC to get the DC voltage up to a weak 60V. This 60V was then alternated through an H-Bridge to get ~110VAC. It works! But the DC-DC boost circuit can't sustain the high voltage for more than a few seconds - just about perfect because we just need to ring the bells for a second or two and then pause between rings.
 
The ringer circuit must use the 3.7VDC nominal from the battery and output ~80VAC to get the coil to kick the hammer between the two gongs. Tricky to say the least. Pete Dokter (mad genious) used a basic DC-to-DC step up IC to get the DC voltage up to a weak 60V. This 60V was then alternated through an H-Bridge to get ~110VAC. It works! But the DC-DC boost circuit can't sustain the high voltage for more than a few seconds - just about perfect because we just need to ring the bells for a second or two and then pause between rings.
  

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