Bridge Amp
Owner’s Guide
36
Introduction
Conventional amplifiers usually have controls on the front to adjust
for the connected transducer: this means making adjustments each
time you change transducers or amplifiers.
Front-ends controlled by ADInstruments software are designed to be
easily transferred between recording units, and to be quick to
disconnect and reconnect, so it makes more sense to adapt the
transducer. The change needs only be done once for any third-party
transducer, which can then be used with any Bridge Amp with the
same connector. Once set up, multiple transducers will work with the
same Bridge Amp without needing further adjustment, and one can
simply change connected transducers as required.
Some soldering of components is required to adapt third-party
transducers for use with your Bridge Amp. If you have little
experience with electronics and no technician to assist you, your
ADInstruments representative should be able to help.
Types of Bridge Amp and Adaptation
The ML118 Quad and ML119 Octal Bridge Amps have a fixed
excitation voltage of 8 V (±4 V with respect to ground). You cannot
adjust the offset voltage range of the zeroing circuit for these front-
ends. Adapting powered transducers for them is relatively simple.
Transducer Adaptations
This section covers adapting transducers for use with the
ADInstruments Bridge Amps.
To connect transducers that require some form of power supply from
the Bridge Amp, first read this section carefully. The requirements of
the transducer should be determined before attempting to connect it.
To adapt a transducer for use with the Bridge Amp, you need to:
•
set the excitation voltage for the transducer
•
wire the transducer to use the eight-pin DIN plug.
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