The Multiboard allows simple and stable amplification of
our photodiodes or any other active optical components. In most applications of
optoelectronic photodiodes, such as the TW30-series, only very small
photocurrents are generated. These currents, ranging from a microampere down to
some picoamperes, cannot be measured by commonly available multimeters
an amplifier is needed. We supply this small multifunctional amplifier board
for developers in order to simplify and support application development.
Note: The board is shipped without any photodiodes.
Can be configured either as 2 independant amplifier channels
or as as a single two-stage amplifier
Fixed and variable gain settings
Single stage current gain of up to 107
Single stage voltage gain of up to 103
Can be used with either a single or dual power
Photodiodes plug directly into sockets or can be externally
connected via screw terminals
The Multiboard consists of two independant amplifier
channels with adjustable gain. By using jumpers one can select the amplifier
type (voltage or transimpedance amplifier) and configuration (two independant
amplifiers or single two-stage amplifier) as well as the gain.
The board provides current gain in the range
105 V/A to 107 V/A and voltage gain from 2 to 1000 V/V in
single-stage configuration. Additionally to the fixed gain factors are
potentiometers for custom gain factors in the range 104 to
106 V/A. By two stages one may reach current and voltage gains of
1010 V/A and 105 V/V respectively, if offsets are
carefully adjusted. The maximum usable output voltage range is +/-4 V and this
must be considered while calculating gain factors.
The circuit is ideally operated with a dual power supply
of +/-9 V to +/-24 V. For lower performance measurements a single supply of 24
V to 36 V may be used. In both cases stabilisation is not required.
Note: Applying a voltage with the wrong polarity will
destroy the board.
The photodiodes plug directly into sockets or are
externally connected via screw terminals. The output voltages are available at
The boards dimensions are 45 mm x 60 mm and the height
is about 12 mm without photodiodes.