On 7/9/2017 1:13 PM, Ian Field wrote:
The DSE one has a comparator rigged to generate spike pulses -
the ringing pulses clock a logic 1 along a shift register and
basically counts how many times the inductor rings.

The schematic is floating about the web, and there's nothing
hard to find in the parts list.

https://www.flippers.com/fbt-main.html



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wa6fwi
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