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TL072ACD dual op-amp
U20, U24, U29
AD712JRZ dual op-amp
U9
TL074CDR quad op-amp
U25
The following devices are standard through hole parts.
78L05 +5V regulator
U14
LM4040-5.0V 5V reference
U26
Trimmers (preset) resistors
The multiturn trimmers are Bourns 3296W, Vishay T93YA or similar.
10K multiturn trimmer
T1A, T2A, T3A, T1B, T2B, T3B
5K multiturn trimmer
SCL_A, SCL_B
Miscellaneous
Leaded ferrite bead
L1, L2
2 x 5 0.1” boxed header
STRIPE
2 x 8 0.1” boxed header
EXP1, EXP2
4 way 0.1” SIL socket
CN9, CN12
10 way 0.1” SIL socket
CN1, CN2, CN3, CN4, CN5, CN6, CN7, CN8, CN10, CN11
CN1 to CN12 are mounted on the underside of the board, facing down, and soldered from the top.
Special care must to be taken to ensure that these connectors are mounted perpendicular to the
board surface.
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