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BC-2001 CR2032 2032 Battery Holder BA9VPC 9V 2xAA cell battery holder, http://www.keyelco.com/product-pdf.cfm?p=710 Battery holder for 2020, 2025 and 2032 coincell batteries. Http://www.keyelco.com/product-pdf.cfm?p=798 Keystone type 105 battery holder for CR1216/1220/1225, https://linxtechnologies.com/wp/wp-content/uploads/bat-hld-012-smt.pdf battery holder Keystone type 3008 coin cell vertical Panasonic CR-2354/VCN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D486.PDF battery CR-2354/VCN coin cell retainer SMT battery holder Keystone type 1057 coin cell vertical Panasonic CR-2354/VCN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D486.PDF battery CR-2354/VCN coin cell holder Keystone type 107 battery holder with leaf spring, Keystone, https://ken.keyeuro.eu/cat/590.pdf AA battery cell holder CR2032 retainer clip, SMT ( http://www.farnell.com/datasheets/1505853.pdf BC-2001 CR2032 2032 Battery Holder BH-331P Battery Type 3xAAA Keystone type 107 battery holder Keystone type 2993 negative battery contact Keystone type 103 battery holder Keystone Battery Holder 18650 Battery Holder SMD Tactile Switch, B3SL Middle Stroke Tactile Switch, B3SL Middle Stroke Tactile Switch, B3SL Middle Stroke Tactile Switch with High Contact Reliability, Top-actuated Model, without Ground Terminal, with Boss SPST button switch | | | R8, R10, R12 | 3 | 2N3904 | Small Signal NPN Transistor, TO-92 | | Tayda | A-553 | | | Q1, Q2, Q3 | 3 | 2_pin_Molex_connector | 2 | 1M | Resistor | | S3 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-14/SOIC-14 | | S3 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 | | R30 | 1 | B10k | \*\*Potentiometer, 16 mm vertical board mount | | | | Screws, nuts, and spacers (see [build notes](build.md)) | | Tayda | A-804 | | | | | Tayda | A-1624 or A-2969 | | | | | J1 | 1 | SW_3PDT_x3 | Switch, single pole normally-open illuminated tactile switch D Single Pole Single Throw (SPST) switch, small symbol D 11x DIP Switch, Single Pole Single Throw (SPST) switch, small symbol D 2x DIP Switch, Single Pole Single Throw (SPST) switch with LED, generic K switch normally-open pushbutton push-button D MEC 5G single pole normally-open tactile switch SPST right angle, PTS645VL58-2 LFS C&K Button tactile switch K switch normally-open pushbutton push-button LCD illuminated right angle stacked dual USB 3.0, type A, right angle USB TYPE C, USB 2.0, SMT, https://www.jae.com/en/connectors/series/detail/product/id=91780 USB C Type-C Receptacle Hybrid CNCTech C-ARA1-AK51X USB Type C, right-angle, SMT, https://datasheet.lcsc.com/lcsc/2204071530_G-Switch-GT-USB-7010ASV_C2988369.pdf USB Type B SMT Horizontal 5 Contacts (https://katalog.we-online.de/em/datasheet/65100516121.pdf Mini USB 2.0 receptacle type B, Horizontal, 2 rows 10 pins wide, https://www.erni-x-press.com/de/downloads/kataloge/englische_kataloge/erni-din41612-iec60603-2-e.pdf DIN 41612 IEC 60603 Q DIN41612 connector, type R/3, Horizontal, 3 rows 32 pins wide, https://www.erni-x-press.com/de/downloads/kataloge/englische_kataloge/erni-din41612-iec60603-2-e.pdf DIN 41612 IEC.

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