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Pocket Geiger Counter with SBM-20 and Li-PO Battery

In this page I'm going to demonstrate which project boxes can be used to install our MyGeiger DIY Geiger Counter kit. Not all boxes can be found in our stock in the store, but I provide a links where it can be purchased. All works require you to have special tools to measure, cut, drill or glue.

MyGeiger ver.2.00

This is second edition of our MyGeiger kit. The kit has several advantages over first edition, such as built-in USB, Li-PO charger and smaller power consumption. The dimensions are very similar to MyGeiger ver.1.00 so it can be installed to the same box type. Here is the links to two models:

Black/Ivory Project Box 125x80x30  (source#1, source#2, source#3)

White Project Box 125x80x30  (source#1, source#2, source#3)

MyGeiger ver.2.00 installation

The black/ivory box has better quality and has 4 included screws, but it hard to cut. The white is cheaper and comes without screws, easy to cut. Internal and external dimensions are the same. I used the black one to install MyGeiger ver.2.00. First at all, you need to remove 4 standoffs that comes with the kit.

To allow PCB installation you need to deepen about 1.5-2mm in the area under SMD inductor. Be careful, the inductor can be broken if you apply to much pressure!smd inductor Check that you did enough to allow the space for the part.

I used dremel bit #100 to whittle away area of 10mmx10mm with 2mm deep to allow the inductor be drowned a little. The PCB can be installed with hot glue over the existing box standoffs. Three tact switches can be fitted with hot glue, but I suggest you to use two component epoxy glue to fix the buttons.

I used 3.7V 300mAh miniature battery installed upright near the LCD shield. The box does not allow a big size lipo be used, but sinse the kit consumes only 5mA even a 300mAh battery can serve it during 2-3 days non-stop. I didn't drilled any holes in tube area because my unit is used mostly for gamma backgorund monitoring and not for testing the samples, so I do not need direct contact with the tube. If you wish, you can drill several holes on the tube side to allow air flow.

MyGeiger ver.2.00 installationMyGeiger ver.2.00 installationMyGeiger ver.2.00 installation

Plastic Enclosure Box G959 (source#1source#2)

MyGeiger installed to G959B  MyGeiger wiring MyGeiger with USB logging

This is another nice box, manufactured by Gainta and really easy to cut. I used knife and file to make LCD window. Because the box has about 2.50cm height you need to solder the kit not exactly as it shown in PDF manual. You'll need 3 additional standoffs M3x8mm and 3 plastic washers. The final hight of the board with LCD shield will be slim. Be carefull with components in high voltage area, check that everything is properly isolated from the LCD shield and other parts. Remember to isolate pin#6 of the PIC18F2550, I just cut it away. Turn blue potentiometer to 300 ohm because its impossible to turn later after you solder LCD pins. Maybe it will be better to implement a non-solder LCD connection, check different connectors in the market. Or use flat cable connector for the LCD because since you solder the LCD shield it will be impossible to access the components under the shield.

SBM-20 cannot fit into this enclosure, only if you cut one of box standoff on the right side. Because of G959 height limitation I selected SI-29BG tube and 850mAh Sparkfun lipo battery. The battery can be fitted under the PCB. Because lipo battery can be easily punched, be sure to cut properly all sharp ends on the bottom side of the pcb. LCD protective foil with insulating tape can protect the lipo well.

MyGeiger pcb  MyGeiger slim installation  MyGeiger lipo installation

The charging red led fitted on the left side.

MyGeiger USB Logging and Charging

Serpac H75 designed by Atomic.Dave

This is the new MyGeiger2, hand fabricated and finished by Atomic.Dave. All factory tactile switches, event LED, and display were relocated from the PCB to the case. Even the event piezo was mounted under the radiation trefoil with an added port to increase volume. On the base plate is access to the mini usb for charging and data logging, as well as a relocated charge status LED and Geiger Bot port. On the underside of the case are multiple vent holes to increase sensitivity for the SBM-20 GM tube inside. The unit is powered with a single 3.7V AA sized lithium Ion 2300mAh rechargeable placed in a battery holder for easy removal and replacement. By using a triple pole triple throw switch, you are able to turn on the unit either in audible or silent alert mode. The enclosure is a Serpac H75 measuring 182.9mm X 92.7MM X 30.5MM.



MyGeiger ver.2.00 installation by Atomic.Dave  MyGeiger ver.2.00 installation by Atomic.Dave  MyGeiger ver.2.00 installation by Atomic.Dave

MyGeiger ver.2.00 installation by Atomic.Dave  MyGeiger ver.2.00 installation by Atomic.Dave MyGeiger ver.2.00 installation by Atomic.Dave wiring

White SerpacH75 with external LND-7317 tube probe and internal SBM-20

MyGeiger with Serpac H75 and Probe  MyGeiger with Serpac H75 and Probe  MyGeiger with Serpac H75 and LND-7317 Probe

The probe enclosure is Atomic.Dave designed metal box with LND-7317 installation kit. He have black and yellow colored samples in stock. External Probe require additional electronics to drive the tube. You can check the HV module with TTL output here.

HV TTL output probe with LND-7317 tube


Acryllic Laser Cut Box for MyGeiger  designed by cmug

You can download all required files for laser cut on thingiverse.com


Acryllic Laser Cut Enclosure design for MyGeiger