Re: Wall phone - nothing but trouble, really!
I've made several transmitters to the design mentioned by Rambo and never had a problem. They've also gone into telephones that I've subsequently sold and I haven't had any complaints.
HOWEVER, early this year I moved my internet and PSTN service from Virgin to PlusNet and found that they didn't work until I upped the zeners in the bridge to 15V.
As for Boombox's bell, the official adjustment instructions are attached.
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