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Entrex Trapezoid Keyboard - Typewriter reference design (Entrex) | Open App Note

Entrex

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Components (13)

Reference	Value	Description
U1	74LS00
U2	8748
U3	SN75453
U4,U5	74LS04
U6	7442
U7	LM319
U8	74LS145
C1-C14	C
D1-D12	1N4004

Entrex schematic

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Entrex board