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4QD controllers
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This component layout refers specifically to the Issue 24 NCC series controllers.
Layout Diagram
Issues 18 through 24 are all vey similar however. See Issues 18-24 history.
The component density of the circuit board is high so there is little room for annotation. The drawing therefore shows resistor and capacitor values and transistor numbers (in red).
The top side track is also shown but the copper side track has been omitted for clarity.
The left hand end of the board is generally concerned with motor speed control and the right hand end is generally concerned with direction.
NCC-35 uses the same component layout as NCC-60 and NCC-70. Only the centre section changes, as different relays and terminals are used.
