This project response to my need of an universal high voltage power supply to be used with mostly all type of geiger tubes that I have in my collection.
I’ve needed a selectable output voltage between 300V and 900-1000V, low power output, on board pulse counter and maybe a display. All powered by 5V
There is also a JTAG connector for uploading new firmware via a USBAsp programmer. During operation the jtag pins 3 and 4 becomes RX/TX uart. Pin 1 is GND.
The voltage selection jumpers are made to select output voltage when the board is used stand-alone. Make a solder bridge according with the table below and you’ll get the corresponding output voltage out.
The firmware is in currently developement but it’s already stable, counts pulses, display voltage and also send info like pulses/voltage via UART.
This project was published on Kickstarter and was active for pledges during all the month of September. I’ve realy appreciated the 30 pledges (one was for two boards) received, that made me capable of buy all the tooling needed to build the boards and further inprove their design.
At the moment the boards are travelling around the globe to reach their owners. I’ve send most of them to USA and Australia but also to Japan, Germany, Switzerland, Canada, Spain, Russia, Ireland and UK. I’m very happy about this result. This make me feel like a multi national corporate, it stimulate my hungry for new projects. Thank you again and stay tuned, you’ll see some new crazy project soon!
Here you cand download the board manual complete with schematic MadexpHV manual 0.3