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BackQuad would add very little cost even without 1v/oct, could be done externally with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, CR1220 battery holder, Memory Protection Devices P/N BA9VPC, http://www.memoryprotectiondevices.com/datasheets/BA9VPC-datasheet.pdf PP3 Battery Holder 18650 Battery Holder SMD Tactile Switch, B3SL Middle Stroke Tactile Switch with High Contact Reliability, Top-actuated Model, without Ground Terminal, with Boss SPST button switch OFF-(ON) | Dailywell | PAS7B3M1CESA6-5 | Tayda | A-1531 or A-557 | | | .
- LFCSP, 48 Pin (https://www.jedec.org/standards-documents/docs/mo-142-d variation CB.
- Pitch=44.60mm, , diameter=49.3mm, Vishay, TJ8.
- -0.0819649 0.0819028 -0.993264 vertex -4.02975 -3.69322.
- Transformer, 1:1:1 or 2:1:1.