Integrated Circuits

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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:

Eagle footprint data: AD5204a.png

Eagle library (footprint, schematic symbol)

voltage regulator

LT1528 LT1528 High current, Variable Voltage Regulator

TPS V-Reg 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.

Main-LM7805.jpg 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 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.

LT1168 Programmable-Gain Precision Instrumentation Amplifier - Low Power, Single Resistor Gain Programmable, Precision Instrumentation Amplifier

LT1114 Low Power Precision OP-Amps are used for amplification and filtering of the signal - Dual/Quad Low Power Precision, Picoamp Input Op Amps