Print PDF
Favorite
Email
Step 4Installed
When I went to install this, I found that the doorbell wiring was a tangled rats nest that was impossible to work with. So I made a little junction panel out of a piece of basswood and some screw-down junctions. Two wires from the transformer, two wires from each of the two doorbell buttons, three wires from each of the two doorbell ringers, all come into separate screwdowns on the outside rows of the junction panel, and are connected using short patch wires between the inside rows. The panel is screwed into the wall with 1/4" standoffs.
The project box is mounted using velcro against the wall, sitting on the top edge of the junction panel.
Rather than relying on a battery, I added a the smaller project box on top. This contains a bridge rectifier, a 1000 uF 35V capacitor, an LM7809 voltage regulator on a small heat sink, and the 7809's ripple caps. This converts the doorbell circuit's 16VAC into 9VDC, which is acceptable as input to both the 7805 and the BS2's onboard voltage regulator.
You can see the transmitter hanging on a nail.
The project box is mounted using velcro against the wall, sitting on the top edge of the junction panel.
Rather than relying on a battery, I added a the smaller project box on top. This contains a bridge rectifier, a 1000 uF 35V capacitor, an LM7809 voltage regulator on a small heat sink, and the 7809's ripple caps. This converts the doorbell circuit's 16VAC into 9VDC, which is acceptable as input to both the 7805 and the BS2's onboard voltage regulator.
You can see the transmitter hanging on a nail.
| « Previous Step | Download PDFView All Steps | Next Step » |
 |
Add Comment
|
