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6v) but many external clock sources cycle between 0v and 5v or even much less. - One potentiometer for internal clock signal (possibly external). Commonly called a "Baby 8", so called because it's a simple implementation. Can be done with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, 12mm CR1220 battery holder, Keystone P/N 2462, https://www.keyelco.com/product-pdf.cfm?p=1027 1xAAA Battery Holder, 2479, Battery Type 3xAA (Script generated with kicad-footprint-generator Mounting Hardware, inside through hole M3, height 2, Wuerth electronics 9774015960 (https://katalog.we-online.de/em/datasheet/9774015960.pdf,), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 20 Pin (http://ww1.microchip.com/downloads/en/DeviceDoc/20%20Lead%20VQFN%203x3x0_9mm_1_7EP%20U2B%20C04-21496a.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py SOIC, 8 Pin (http://www.ti.com/lit/ml/mpds400/mpds400.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-125-02-xxx-DV, 25 Pins per row, Mounting: Snap-in Plastic Peg PCB Lock (http://www.molex.com/pdm_docs/sd/039300020_sd.pdf), generated with kicad-footprint-generator JST SH series connector, S24B-PHDSS (http://www.jst-mfg.com/product/pdf/eng/ePHD.pdf), generated with kicad-footprint-generator JST SHL series connector, 53780-0270 (), generated with kicad-footprint-generator.

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