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Registered Member #1412
Joined: Thu Mar 27 2008, 04:07PM
Location: Taipei Taiwan
Posts: 278
I want to build a geiger counter,but most of the geiger tube power supply I found on the internet seems to be not regulated or only rely on zener diodes to clamp the output voltage.I build some of them but the output voltage is unstable and producing spikes.I'm afraid that I may damage my tube.What is better solution?Should I use a SMPS controller IC to build a step up converter?
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
boost and flyback converters can be extremely efficient voltage sources, and when using divider feedback along with large filter capacitance and chokes, you wont even see the ripple.
Registered Member #3215
Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780
I checked with basic RLC filter, it is easy to get less than 1% of ripple if the original ripple is 50Vpp 400Hz, you should just design a one stage RLC with a Fres at that frequency
Registered Member #1412
Joined: Thu Mar 27 2008, 04:07PM
Location: Taipei Taiwan
Posts: 278
I build this circuit but it didn't oscillate.I use TL072 in my junkbox instead of max4162.Is this why it didn't work?the output of my opamp is 5V but 74HC14 didn't oscillate.
Registered Member #5136
Joined: Sun Jun 03 2012, 03:07PM
Location: Utrecht, Netherlands
Posts: 6
hsieh wrote ...
I want to build a geiger counter,but most of the geiger tube power supply I found on the internet seems to be not regulated or only rely on zener diodes to clamp the output voltage.I build some of them but the output voltage is unstable and producing spikes.I'm afraid that I may damage my tube.What is better solution?Should I use a SMPS controller IC to build a step up converter?
Thanks
I build this schematic, it works very well:
It's a HV generator that shuts off when the required voltage is reached and only recharges when voltage over the output cap gets too low. It has some ripple on the output due to the switching, but the circuit has a really low current draw, about 0,25 mA in idle. It's of course possible to add a RC filter to remove some of the ripple. To add a flashing light and clicks, just connect a 50K potmeter between the cathode of the tube and earth, and feed the wiper into a darlington transistor, I used a BC517.r
This circuit is one of the best I have found. It's small, uses fairly standard components and draws little current.
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Regulated power supply for geiger tubes?
