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Operational amplifier, DIP-8 Small Signal NPN Transistor, TO-92 KK254 Molex header 2.54 mm spacing | Tayda | A-3186 | | | | C1 | 1 Consider replacing transistor through-holes with sockets or 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 BH-331P Battery Type 3xAAA Keystone type 1058 coin cell cr1216 cr1220 cr1225 1xPP3 (9V) battery holder, Keystone P/N 2462, https://www.keyelco.com/product-pdf.cfm?p=1027 1xAAA Battery Holder, 2479, Battery Type 3xAA Battery Holder BH-331P Battery Type 3xAAA Keystone type 3034 coin cell retainer Keystone 3034 SMD battery holder coin cell retainer Keystone type 3008 coin cell vertical Panasonic CR-2032/VS1N battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D348.PDF battery CR-2032 coin cell vertical Cherry MX keyswitch 1.25u Matias/ALPS keyswitch, 1.75u, http://matias.ca/switches/ Matias ALPS keyswitch 6.25u Matias/ALPS keyswitch, 2.25u, PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc3fah-0 A Series.

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