This 74HCT240 octal (8 channel) inverter chip is more power efficient than the AC series, but can't drive as heavy loads. This makes it more suitable for solar BEAM applications.
The 74AC245 is an octal (8 channel) buffer chip that simply strengthens the current output of a signal. Great for small-motor driving!
The SGS Thompson L293D is one of the most common motor driver chips, with built-in protection from the abuse motors can create.
The SGS Thompson L298 motor driver chip is a brute of a motor driver, designed for up driving 4 amperes at 46 volts.
The LM339 is very similar to the LM324 but with open collector outputs.
A little 8 pin DIP that can be hacked into a light or line following robot known as the "Herbie".
The LM393 is a dual-comparator chip that is the heart of the popular "Sandwich bot" project in the book "Robot Building for Beginners"
Low voltage dropout regulator.
A 28 pin 8 bit microcontroller in a DIP package as used on the Sumovore Atmel Brainboard add-on.
Fairchild 555 Timer IC
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