Tekno the Robotic Puppy Schematic
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The circuitry of Tekno represents a minimal and inexpensive robotic solution with
a wide range of functionality. It might engender ideas for inexpensive solutions.
More info can be found on the Tekno website.
What says "light sensor" is probably a microphone.
The unit uses split power, with 4.5v for the electronics and 10.5v for the motors.
The h-bridge, which drives the main motor, is a simple and cheap bipolar transistor affair
- this circuit has a "smoke" mode in the case where both inputs are high simultaneously.
The motors are probably quite noisy electrically, as most toy motors are, so they
use capacitors across, and inductors in series with, the terminals.
The speaker amplifier could probably use a resistor in series in the lead from the
transistor base to the microcontroller pin driving it - furthermore, a constant DC output
from the microcontroller will probably burn out the speaker.
This design could be improved for safety reasons.