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Doorbell chime issues

Hello and thanks to anyone who tries to help me.
I have installed new wiring, buttons and a chime for my two doors and have a few troubleshooting questions.

1. Transformer has a 15v screw and a 20 volt screw but chime says "do not exceed 15v". Do I have a problem?

2. Doorbell required a diode but the new buttons did not come with one! Yes, I bought wired doorbells. I went to Radio Shack and bought 16v diodes. Was this correct?
Is this why my chime won't stop chiming?

Thanks for your help.

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