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Transistor replacement 2 – pack ZTX553-ND MSx30 Q22, Q23
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This is the Bosch BIP373 coil driver triple darlington on its own. If replacing a VB921, you must use a mica insulator. For a BIP373 packaged with a mica insulator, or more information on BIP373s, please see our BIP373 mod kit.
5 pack of PN2222AD26ZCT-ND NPN transistors.
Replacement for V2.2 Q3, Q5, Q9-Q11
Transistor replacement 2 - pack ZTX450-NDMSx30 Q2, Q4
PNP 200 mA transistor. As used in the MSStim V2.2 and later.
9 pack of 2N3904FS-ND transistorsMSx30 Q6, 7, 8, 10, 1, 14, 15, 19, 20These transistors are used as general purpose switching transistors at many points in the V3.0 board.
Package of 2 TIP42COS-ND transistors.These go in the Q3 and Q11 slots on the V3.0 board and are part of the active flyback circuit.
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