Editing Cellular Rotary Phone
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===Project Scope=== | ===Project Scope=== | ||
− | <b>Description:</b><br> This is a deeper look into the Port-O-Rotary phone. We stuck the GM862 | + | <b>Description:</b><br> This is a deeper look into the Port-O-Rotary phone. We stuck the GM862 cellular module into an old rotary phone enclosure, and viola, it was an instant, ridiculous, hit. |
Here we are going to breakdown the schematics and systems of the rotary phone. | Here we are going to breakdown the schematics and systems of the rotary phone. | ||
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===Power=== | ===Power=== | ||
Really simple - the GM862 requires 3.8V and a Lithium Polymer outputs 3.7-4V. No regulator needed, but we will need a charger. We currently use an external charger from a third party company. Aubrey noted the GM862 has a built in Lithium-Ion charger that may work, we haven't tested it yet. Ideally we would stick a barrel jack in the back of the enclosure where the RJ11 telephone jack used to reside. Anyone have any recommendations? | Really simple - the GM862 requires 3.8V and a Lithium Polymer outputs 3.7-4V. No regulator needed, but we will need a charger. We currently use an external charger from a third party company. Aubrey noted the GM862 has a built in Lithium-Ion charger that may work, we haven't tested it yet. Ideally we would stick a barrel jack in the back of the enclosure where the RJ11 telephone jack used to reside. Anyone have any recommendations? | ||
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Here's the good stuff. Well, it will be here once I can get to the updated schematics. | Here's the good stuff. Well, it will be here once I can get to the updated schematics. | ||
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===Audio Considerations=== | ===Audio Considerations=== | ||
We hooked the handset mic and ear-piece directly to the GM862 without any external components. The mic was biased through a 10k resistor using the 3.7V off the battery. One would think that this would be a clean source of DC power, coming directly off a high current battery. In practice however, there is some horrendous buzzing in the ear piece. Funny thing, when we disconnect the mic, all the buzzing went away. | We hooked the handset mic and ear-piece directly to the GM862 without any external components. The mic was biased through a 10k resistor using the 3.7V off the battery. One would think that this would be a clean source of DC power, coming directly off a high current battery. In practice however, there is some horrendous buzzing in the ear piece. Funny thing, when we disconnect the mic, all the buzzing went away. | ||
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<b>Supplier Info:</b><br> | <b>Supplier Info:</b><br> | ||
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<b>Related Items:</b><br> | <b>Related Items:</b><br> | ||
[[GM862 Cellular Module]] | [[GM862 Cellular Module]] | ||
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