http://www.jinstartech.com/

General Attributes:

Thorlabs AMP220 very good price

AMP220

Gain: 10 V/V

Features

• 100 kHz Bandwidth
• <3 µs Rise/Fall Time
• Fixed and Switchable Gain Models
• Max Input Voltages:
  • AMP220: ±200 mV
  • AMP210: ±2 mV
  • AMP200: ±200 mV, ±20 mV, or ±2 mV (Differs with Selected Gain)
• Adjustable Voltage Offset for Dark Current Compensation
• Compact, In-Line Design for Use Between Two BNC Cables
• DS5 USB Power Supply and 1.5 m Long Micro-B USB Cable Included

Thorlabs' AMP200 Series of Voltage Amplifiers are designed to amplify the output signal from low-output-voltage devices such as thermopile power detectors, photoconductive detectors, or pyroelectric energy detectors. The offset caused by the dark current of a connected photodetector can be compensated for using the Zero Adjust screw on the output end of the amplifier (see Figure 1.2). A switch allows the output signal's sign to be set based on the connected photodetector's polarity (Invert: 1/On or 0/Off).

Each voltage amplifier has an in-line box design with two female BNC connectors and is intended to be used between two BNC cables. These amplifiers are powered through a Micro-B USB port using the included 5 V, 2 A power supply or any other available USB port. An LED next to the USB connector indicates active power supply. The internal electronics of the amplifier regulate the power to the amplification circuitry, isolating the device's performance from electrical noise that may be inherent to the power source.