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One op-amp, four transistors and some supporting components. ~$6 in parts, needing only one side to center of hole, with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, 12mm CR1220 battery holder, Memory Protection Devices P/N BC2AAPC, http://www.memoryprotectiondevices.com/datasheets/BC2AAPC-datasheet.pdf 2xAA cell battery holder, Keystone P/N 2462, https://www.keyelco.com/product-pdf.cfm?p=1027 1xAAA Battery Holder, 2479, Battery Type C (https://www.bulgin.com/products/pub/media/bulgin/data/Battery_holders.pdf Comfortable Electronic CR2450 battery holder, http://www.comf.com.tw/ProductDetail.asp?no=148 Keystone type 103 battery holder Keystone SMT (Auto-In/Ultra-Low) Holder for 2032 Cell, 33.2 x 23.9mm, 2mm height above PCB, https://www.keyelco.com/userAssets/file/M65p4.pdf Keystone type 3009 coin cell retainer SMT battery holder Keystone type 3034 coin cell holder 2xAA cell battery holder, Memory Protection Devices P/N BC2AAPC, http://www.memoryprotectiondevices.com/datasheets/BC2AAPC-datasheet.pdf 2xAA cell battery holder, Memory Protection Devices P/N BA9VPC, http://www.memoryprotectiondevices.com/datasheets/BA9VPC-datasheet.pdf PP3 Battery Holder 2479 Battery Type 3xAAA (Script generated with kicad-footprint-generator Mounting Hardware, inside through hole M2, height 5, Wuerth electronics 9774010482 (https://katalog.we-online.de/em/datasheet/9774010482.pdf), generated with kicad-footprint-generator Soldered wire connection with feed through strain relief, for 6 times 0.25 mm² wires, basic insulation, conductor diameter 0.9mm, outer diameter 2.7mm, size source Multi-Contact FLEXI-E 1.5 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator ipc_gullwing_generator.py LQFP, 80 Pin (http://www.microsemi.com/index.php?option=com_docman&task=doc_download&gid=131095), generated with kicad-footprint-generator Molex MicroClasp Wire-to-Board System, 55935-0910, with PCB locator, 15 Pins (https://www.molex.com/pdm_docs/sd/026604020_sd.pdf), generated with kicad-footprint-generator Hirose series connector, 502443-0870 (http://www.molex.com/pdm_docs/sd/5024430270_sd.pdf), generated with kicad-footprint-generator JST SH series connector, S7B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py DD Package; 8-Lead Plastic Dual Flat, No Lead Package (UC) - 3x3x0.5 mm Body [SOIC], pin 7 8-lead though-hole mounted.

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