New note: apparently this power supply (1000V option without the anode resistor) can be used to drive 100MOhm PMTs
Please find below a message from one of the buyers:
Hi, the item is arrived today, very fast delivery. The module was exactly set to 1000V as you write. With 100 MOhm NaI scintillator probe the voltage drop is between 1 to 2 V. Very good. As comparison theremino with same probe drop of 30V. I haven’t do a long test about voltage stability but in short time seems to be very good to. … … Anyway congrats for your power supply. Low price and good performance. 5 stars.
Robertino B.
—
Currently I also have the following tubes in stock (please inquire by message):
SBT-9 (alpha beta and gamma)
SBM20 (beta and gamma)
SI-29BG (beta and gamma)
SBT11 (alpha beta and gamma)
SI8B (alpha beta and gamma)
SBT10 (alpha beta and gamma)
SI22G (gamma)
IMEX-38-56-1 is an adjustable high voltage generator module for Geiger-M
ü
ller tubes.
The module is for use in geiger counters and dosimeters where portability, small size, very low power consumption and stability is required.
Specifications:
supply voltage:
3-6.5V
High voltage:
<400 to >550V
(
<700 to >1000V custom range possible on request)
adjustable with a 24 turn trimmer potentiometer. Practically all popular western and russian-made
Geiger-M
ü
ller tubes are supported. Current limiting 5M1 resistor is already installed (for most
Geiger-M
ü
ller
tubes of Russian
origin).
Low quiescent (standby) current:
< 10μA
(at 400V setting/no load typical average
quiescent current
is
7
μA)
Low ripple:
1 to 5V
(usually 1V)
Working temperatures:
-20 to +60
ºС
Dimensions: L
36
mm
x
D
23
mm
x
H
6mm
Pin from left to righ spacings from the left side:
HV pin 5mm, GND pin 10mm, Vcc 25mm
Vcc pin to the right side is 11mm
Weight: 5
g (0.17637 oz)
Three pin module: pin 1 HV, pin 2 GND, pin3 positive input voltage
Currently shipping modules are produced on the factory made PCBs (green color solder masked) and encapsulated in epoxy for isolation purpose.
Color of the resin may vary (transparent or black – depending on the current supply)
Each module is professionally tested after manufacture and before shipping.
—
In the below graph a dependency of the output voltage on constant load current is provided for when the device is preset for 400V and powered from 5V power source.
To correctly estimate the power of the HV generator, measurement was taken with the serial, output 5,1MΩ current limiting resistor removed.
Micro-ampermeter with a very low (10μV/1μA burden voltage) was used to do the measurement so the graph is rather precise.
The
continuous load
current where the voltage begins to drop below 397V is 107,8μA while one section geiger tube
pulse (noncontiguous)
currents are usually in magnitude of 1 to 3
μA.
Multi-section pancake geiger tubes are accommodated well too i.e. SBT11 ( which has 4 sections ) has a combined current specified at min. 4
μA
and max. 11
μA or
a 10-section SBT10 pancake tube
pulse
current
of one section is
min. 0.3
μA
to max. 1,5
μA
. It means that at the maximum specified count rate these tubes shall be correctly powered with the at the nominal working voltage without compromise.
On the shipping device
the
5,1MΩ
resistor
is installed
by default
as geiger tubes usually need such resistor with its values starting form around
5,1MΩ.
Therefore if for reasons of you intended use you would like the device without the above mentioned resistor please let me know during purchase.
The basic chematics for use of this module can be found on my blog on blogspot.
Can’t give a link here because as of September 2017  eBay started to prevent linking to proprietary sites, but you can search
arduino-geiger-pcb with your favourite browser. Then on the blog look for the article called “
Use of the IMEX-38-56 High Voltage generator – iPhone Geiger Counter (Geiger Bot app)
“
).
In video below you can see how the device can be used  (note: video is provided for reference only and is not a description of the item itself)
—
We accept paypal only and shall attempt sending the board within one working day after the receipt of the payment. You shall have to bear any customs or other duties and taxes of your country whatsoever.
—
We shall ship the item from Europe Worldwide as a Standard Int`l package. Please allow enough time for a shipment to arrive especially if item is sent between continents. Delivery times within Europe are <~1-1,5 weeks. To USA or Asia 2 to 3 weeks.
Shipping to Japan is free of charge.
Happy bidding!
Happy bidding!
Please check
other items I am selling on eBay
Thank you for reading!