Stepper Control Board
This document describes the Control Board for the 2-phase Steppers used for
the robot. Each phase of the 2 Steppers should have a restance above 30
Ohms. Each phase must not consumpt more than 300 mA. In our particular case
the used Steppers have 37.5 Ohms per phase. We made some major enhancements
while assembling the prototypes on PCB.
You will have to put some 10k into the SMD pads (red marks in the bottom
view below !) on the bottom side of the
PCB, near the BC550. But if you some FETs at hand to plug in that can stand
up to 8V at their gate .. ok you do not need them, because the Maximum-Gate-Voltage is not exceeded.
And you also may put an additional 100nF to some ICs between GND and VCC against transients and glitches...
Bottom side:
Top side:
Here you may download the TOP and BOTTOM layers of the routed layout here ...
The bottom layer is allready mirrored !! If your printer is capable of Postscript you
may just send him these file directly to print your layout
download the top-layout as Postscript here
download the bottom-layout as Postscript here
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The most parts have been exchanged during assemblation so here are both parts listed ...
You will need:
pcs type type in plan
3 74LS04 7404 (HCT or 7404 may also be ok but NO CMOS -> 3V !!)
1 74573 74573 LS, HCT, or whatever you appreciate (this is just a latch and may not be needed)
8 1N400x 1n4148 (voltage doenst matter but current does and these are capable of 1A about 400mA should suffice )
2 capacities about 10uF and appropriate voltage
8 BC550 BC547 just for signal amplification (about 20mA)
8 BC337 BC640 power-stage (300-500 mA)
8 BS170 MPF910 power-stage (300-500 mA)
16 SMD 10k resistors (optionally ?)
16 1k resistors
3 14 Pin sockets
1 20 Pin socket
and of course some of these pin-connectors !
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