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3 Hardware/PCB/precadsr/precadsr.sch | 472 aoKicad | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/> Small Signal NPN Transistor, TO-92 KK254 Molex connector 2.54 mm spacing | Tayda | A-2939 | | | J7 | 1 | 1 | 1uF | Film capacitor | | | R21, R22, R23 | 3 | 100R | Resistor | | | | S1 | 1 | TL074 | Quad operational amplifier, DIP-14 A-1135 2 8 pin connector, https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F215079%7FY1%7Fpdf%7FEnglish%7FENG_CD_215079_Y1.pdf%7F215079-4 connector TE-Connectivity Micro-MaTch Vertical 215079-4 7-215079-4 TE-Connectivity Micro-MaTch female-on-board top-entry thru-hole 14 pin DIP socket.

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