This preamplifier is suiteable for Russian corona counters, it uses a Schmidth trigger to discriminate the noisy baseline typical of these detectors. The trigger point or the LLD is adjustable via a 25 turn trimpot, a second trimpot is available for adjusting the level of hysteresis required. These two adjustments make it possible to tune this preamplifier to work with different tubes. 


Typical raw pulse from corona neutron counter

raw neutron detector pulse trace

When the input signal (red trace) exceeds a set threshold, the schmidt trigger output goes high, simultaneously the input lifts to a new level thereby maintaining the higher level (grey trace)  until it falls below the threshold, causing the output to go low. The resulting output is a clean on off signal.

           Clean output pulse


(note: due to the slew rate of the opamp and the short pulse time, the actual output pulse will look narrower at the top)


Some knowlege of electronics and preferably an oscilloscope and a DVM  is required to fine tune the preamp for use with your detector.

Connection Specifications

  1. HV Bias
  2. HV ground 
  3. Detector pos
  4. Detector Ground
  5. 9V Positive
  6. 9V Ground
  7. Signal Positive (DC coupling)
  8. Signal Ground

Coupling Specifications

  1. Coupling Resistor 100 M Ohm (or, specify other at time of ordering)
  2. Coupling capacitor 10 nF

Power Specifications

  1. Input power 9V Battery
  2. Regulated circuit voltage 2.5V
  3. Output Voltage typical 0 - 1.7V  150 ┬Ás


  1. Diameter 51 mm
  2. Height 14 mm

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  • USD 99.00

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Return shipping address: Bee Research, Po Box 6259, Alexandria, NSW 2020, Australia