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My son designed it simply aa battery power supply 12v out to a on off switch, then to the drive in the image, the 12v battery pack is shown on the base
He is building a rotary film processor
He wants to include a TIMER (we have no idea.
Bought these
https://www.amazon.co.uk/gp/product/B08HQRHSLT/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
and...
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