Me and my high school friend made a DC to DC converter that would give us 30 or so volts at a couple amps from a 12 volt battery. We used germanium power transistors which could not go much above 10 kHz. The Delco’s and the 2N458A’s were our favorites – we managed to push
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Apparently the disasters like storms, tornadoes, hurricanes and transformer failures are eating up all the supplies of distrbution transformers and manufacturers can’t keep up with the demand. If there were a disaster, the orders for replacements to get the neighborhoods back on the grid may be held up for weeks or more. https://www.publicpower.org/periodical/article/appa-survey-members-shows-distribution-transformer-production-notmeeting-demand
This is a link to telecomm information on Tomi Engdahl’s epanorama.net. http://www.epanorama.net/circuits/teleinterface.html#hybrid
I bought several of these miniature audio transformers from Electronic Goldmine. They are encapsulated so I can’t see anything, windings, core or materials. There are 5 pins, 2 on one side and 3 on the other, but the center pin measured open, so it’s apparently there to make sure the transformer is inserted the right way. The
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