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Ste

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  1. I have found an external telephone ringer, which is basically a double coil with a striker that hits two bells as the coils are energised. It has been powered via the telephone line, but Id like to adapt it to sound as an alarm activated by a basic circuit incorparating a door contact as the trigger . I know next to nothing about telephones and their operation, but im told I will require "about 50 - 70 volts AC at 16-25 Hz". Obviousley I havent got such frequencies or voltages, so my question is, can I buy a little basic box of tricks to convert normal mains voltage and frequency to the desired level. Its only a small project to do whilst in lockdown, so the budget is minimal
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