Single Supply DC Instrumentation Amplifier Circuit

A common challenge in building an amateur radio telescope is amplifying the signal from the diode detector circuit.  A simple solution is to use an Integrated Circuit (IC) designed for the purpose, such as the INA122. This particular amplifier is easy to use because it operates from a single supply voltage and only one external resistor is required to set the DC gain. Here is a circuit diagram showing how to use the INA122 to make a  basic DC amplifier.

Circuit diagram of a single supply amplifier

In this particular example the gain is set to 205X. The gain is calculated according to the formula Gain = 5 + (200K / R). The maximum output signal from the amplifier cannot exceed the supply voltage.  The meter or device which reads the output from the amplifier should have a high input impedance. This same circuit can be used to amplify a differential voltage by connecting Pin 2 (V- in) to the reference voltage instead of ground.

Due to numerous customer requests for assistance in finding these amplifiers, we offer a pair (Qty 2) of the INA122 amplifiers shipped anywhere in the world for $12.50

Please note that this offer is for only the Integrated Circuit Chips.  You will need to provide a breadboard, power supply, resistor, etc to complete your amplifier. Numerous other applications are possible with this IC, refer to the INA122 data sheet.

Two DC Amplifier IC's (Catalog #DCAMP)...$12.50, Worldwide Shipping Included!

BY PAYPAL: click the "PAYPAL, Buy Now" button.  Mail Orders: see details below.

 MAIL ORDERING INFORMATION 

We keep ordering simple!  Prompt, courteous 30 day refund policy.

BY MAIL....please send a Check or Money Order for $12.50 for a pair of DC Amplifier IC's to:

MTM Scientific, Inc.  P.O. Box 522, Clinton, Michigan 49236 USA

There are no shipping delays for Personal Checks.  We make every effort to ship promptly.

BY PAYPAL... Click the "Buy Now" button above, or send a Paypal directly to: mtm@mtmscientific.com and noting the catalog number.

(Paypal is a great way to send money using email and a credit card... check it out!)

Click Here to View other Products from MTM Scientific, Inc.