The Amateur Electrician: Build a telephone using a “Ford Spark coil” Modern Mechanix 1930 – Link.
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The Amateur Electrician: Build a telephone
The Amateur Electrician: Build a telephone using a “Ford Spark coil” Modern Mechanix 1930 – Link.
Comments are closed.
It’s not considered good practice to ground things to gas pipes, especially spark coils. (I guess this warning comes 78 years too late)
A knife switch? Love that particular part!