#11,188 in Industrial & Scientific
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Reddit mentions of RilexAwhile 2Pcs Aluminum Hosed Resistor Screw Tap Mounted Wirewound Resistors 50W 25 Ohm for Power Supply Equipment
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Reddit mentions: 1
We found 1 Reddit mentions of RilexAwhile 2Pcs Aluminum Hosed Resistor Screw Tap Mounted Wirewound Resistors 50W 25 Ohm for Power Supply Equipment. Here are the top ones.
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1. Aluminum housing for heat dissipation, suitable for cooling plate installation, can be used in atrocious environment.2. Small size, high power load, standard and non-inductive winding types.3. High insulating capacity, good performance in vibration.4. Multiple connection modes, easy to install.5. Widely used in power supply, transducer, elevator, arena audio and high requirement equipment industry.
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I am going to answer you right here.
The reason your transformers are frying, because you have a short circuit on the low voltage side of the transformer.
First thing you need to do is order this:
https://www.amazon.com/RilexAwhile-Aluminum-Wirewound-Resistors-Equipment/dp/B01N8WQG53/
You need to connect one of those directly to a screw terminal on the low voltage side of the transformer, then one of the wires to the other end of it. The remaining wire connects directly to the free transformer screw. What this does is give you a dummy load in case of a short circuit. This keeps the transformer from blowing.
While you are waiting for them to arrive, disconnect power from the transformer, until you have the resistor you do not need to touch it. Also disconnect the low voltage wires from it. Remove the doorbell and leave the wires disconnected and keep them from touching each other. Now set your volt-meter to continuity/diode check and touch the red lead to one low voltage wire and the black lead to the other. Does it beep? If so, then you have a short in the wiring that you need to track down and fix. If not, then go back out to the door and twist the wires together and test for continuity again. Now your volt-meter should certainly be beeping showing that you have continuity. Now for good measure, untwist and seperate the wires again and test one more time, should be no beep indicating no continuity.
If you have no short and only get continuity when you twist the wires outside together, then as soon as you get the resistor, you are good to go.