Integrated Circuits

The digital Potentiometers made by analog devices (AD5204) has 255 positions can be adjusted by the microcomputer that can receive commands from the computer. This is a great way for analog circuitry to have digital control. This is a chip with 4 digitally controlled POTs and the pots can be daisy chained to have multiple chips controled by a single SPI interface.

Digikey Part Number: AD5204BN10-ND

AD5204 - 4-Channel, 256-Position Digital Potentiometer

http://www.analog.com/images/Product_Descriptions/40826AD5204_S.jpg

Datasheet: http://www.analog.com/UploadedFiles/Data_Sheets/140808745AD5204_6_0.pdf

Availability:

• Free samples: http://www.analog.com/en/prod/0,,761_797_AD5204,00.html#price
• Digikey: http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=1480&Row=284443&Site=US (10k version - $5.02)

Eagle footprint data:

Eagle library (footprint, schematic symbol)

voltage regulator

LT1528 High current, Variable Voltage Regulator

TPS V-Regs These are 3.3V and 5V LDO, Low-Noise Voltage Regulators. Very small SOT-23 SMD package. 150mA max current. Best used in battery applications.

Basic Voltage Regulators Variable voltage regulators, set output regulators, we give you the whole breakdown. Perfect for use with an external wall-wart power supply.

microcontroller

LPC2103 Low cost 70MHz ARM7TDMI-S FLASH microcontroller from Philips.

Op Amps

op amps: great for amplifying weak signals from sensors to a more useful level. Also used in filters, integrators, etc.