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Spectrum Techniques ST-350 is a self contained Geiger Muller Scaler-Counter Lab.
A built in digital counter, Ratemeter, Variable High Voltage Power Supply, Alarms, and precision Programmable Timer makes the instrument a real joy for any kind of experiments using GM tubes.
Designed specifically for GM tubes, the input sensitivity is factory fixed at about 1.5 Volts. Naturally this is far to high for use with a scintillator probe.
Another handicap is the lack of a "clicker" to indicates counts being received. In a classroom environment, this is a must-have.
To their credit, Spectrum Techniques also recognized the value of both of those features, and have recently added them to their latest offering the ST-360, an updated version of the ST-350.
For those of us lucky enough to have the earlier version, all is not lost.
My scintillator preamp project increases input sensitivity to 30 mV, perfect for scintillators,
and my Speak2Me module provides audio clicks.
A connection via the existing DB-9 connector on the back hooks the Speak2Me to the circuitry and in turn it provides the audio. Both the audio and preamp modules are self contained battery powered so there is no drilling or soldering required to add these features.
Schematics of both the Preamp and Speak2Me are located in FILES section of
Have fun
Geo
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