Mini HV High Voltage Power Supply Module for 400V Geiger Tube with Pulse Output

Description

UNIQUE Mini High Voltage Module for 400V Geiger Tube with Pulse processing circuit
for laboratory usage, portable DIY Geiger Counters or building external Geiger probe with long cable
This is miniature specially designed power supply for Geiger tube with pulse processing circuit. The hardware will allow you to power 400V Geiger Tube and get ready digitized logic level pulses from the output. These ~10uS pulses can be counted by Arduino INT counter or any other microcontroller or ditigal counters. The module can be used for building portable DIY Geiger Counter, Dosimeter or external Geiger probe where you need to drive signal cable or make external probe. The module is ready-to-use unit to power Geiger tube. Can be integrated into battery operated portable equipment or used for laboratory setup.
The module has installed 10 Mega ohm load resistor that fit many 400V Geiger tubes.
Tube cathode is connected to ground GND. The circuit uses anode signal capture method with grounded cathode that's better for less noise. Keep red HV wire short length as possible to reduce parasitic capacitance on tube anode.
High voltage step-up converter has excellent regulation to
keep HV voltage within recommended plateau limits for
correct operation of GM tube!
Every module is professionally assembled and tested. Originally it was designed by me and used for industrial grade devices. Build with only high quality materials and certified components.
Every sample covered with insulation for environmental protection.
Module Size:
22mm x 35mm
Input Voltage:
5.0V - 5.5V
Output Voltage:
390V - 420V
Maximum output current:
50uA
Installed load resistor:
10 Mega Ohm
Quiescent Current on Background:
<1.5mA (may vary, depend on charge pump state)
GM Pulse Duration:
~10uS, VDD logic level
Pinout:
HV:
tube anode(+) (400V)
GND:
tube cathode(-)
VDD:
5.0V
GND:
power supply ground
SIG:
signal output, pulses ~10us
The module is compatible with following GM tubes:
SBM-20, SBM-21, SBM-10, SI-8B, PM-1208, SI-29BG and more 400V models.
The circuit
DO NOT HAVE reverse polarity protection
, be careful to connect VDD and GND in correct way, see the diagram! Do not short-cut High Voltage output! Use heat shrink tube to protect the module from short-cut if your enclosure is metallic!
Arduino UNO example code to catch GM pulses during 1 minute:
// Arduino UNO Example code to count GM pulses during one minute from the detector
// if the INT is floating you may need to add 1K resistor to pull down to GND the INT port
#include
unsigned long counts;            //variable for GM Tube events
unsigned long cpm;               //variable for CPM
unsigned long previousMillis;    //variable for time measurement
void tube_impulse(){             //procedure for capturing events from Geiger Kit
counts++;
}
void setup(){                                //setup procedure
counts = 0;
cpm = 0;
Serial.begin(9600);                        // start serial monitor
// uncommennt if you have time-out problem to connect with Radiation Logger
//  delay(2000);
//  Serial.write('0');                      // sending zero to avoid connection time out with radiation logger
//  delay(2000);
//  Serial.write('0');                      // sending zero to avoid connection time out with radiation logger
pinMode(2, INPUT);                         // set pin INT0 input for capturing GM Tube events
digitalWrite(2, LOW);                      // turn off internal pullup resistors, you may need to add 1K resistor to pull down to GND the INT port (if INT pin is floating)
//---------------------Allow external interrupts on INT0-----------------------------//
attachInterrupt(0, tube_impulse, RISING);  //define external interrupts low-high-low
//-----------------------------------------------------------------------------------//
}
void loop(){                                    //main cycle
unsigned long currentMillis = millis();
if(currentMillis - previousMillis > 60000){   // if 60 seconds are passed
previousMillis = currentMillis;
cpm = counts;
Serial.print(cpm);     // send cpm data to Radiation Logger
Serial.write(' ');     // send null character for "Radiation Logger" to separate next data, check your hardware for actual UART separate sing
counts = 0;
}
}
We'll use the best shipping method availiable to your destination, however some areas and some countries now will take much longer to receive international mail. Please allow longer delivery time than usually and conact me prior buying if you want to change delivery method to DHL Express (recommended).