DIY Robot :Solar-Bug (Fred)

2 Transistors 2N3904
2 pager motors, high-efficient motor
1 solar panel, 3 volts
2 Transistors 2N3906
2 pager motor holders
1 capacitor, 2200uF, 16V
2 blinking LEDs (green or red)
2 resistors 3.3k Ohms, 1/4 watt, 5%
copper wires & heat-shrink tubing
2 tantalum capacitors, 0.22uF
2 resistors 30k or 33k Ohms, 1/4 watt, 5%

1. 2N3904, bend the base lead (middle lead) toward you.
The labelled flat-side facing you and the leads are pointing downward.

2. 2N3906, bend the collector lead (the third lead) away.
The labelled flat-side facing you and the leads are...



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Bipolar Stepper Motor Controller

Here's a little circuit that simplifies interfacing to bipolar stepper motors. It's similar to a common unipolar design available on the internet. However, I modified it to use a pair of MOSFET-based H-bridges. In addition, I added an enable signal so that the motor windings can be disabled to save power. Since there are diodes embedded in the transistors, there's no need to add flyback current protection across the motor windings.

A couple of notes: ORCAD does not explicitly show the power connections for the logic devices so be sure and connect the flip-flop and XOR gate packages to...



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