{"id":135,"date":"2021-11-27T02:13:08","date_gmt":"2021-11-27T01:13:08","guid":{"rendered":"https:\/\/rd-gammaspectra.xyz\/?p=135"},"modified":"2021-11-27T02:13:08","modified_gmt":"2021-11-27T01:13:08","slug":"super-simple-555-geiger-mueller-driver-circuit","status":"publish","type":"post","link":"https:\/\/rd-gammaspectra.xyz\/?p=135","title":{"rendered":"Super simple 555 GEiger Mueller Driver circuit"},"content":{"rendered":"\n

Recently someone asked if it was possible to build a cheap GM-Driver circuit which is a HV source and a pulse output connected to a speaker. When a gamma\/beta\/x-ray is detected by the tube, the unit will make a click noise.<\/p>\n\n\n\n

I’ve decided to make one only by using very standard parts everyone should be able to obtain. To be honestly, I have already built one of those some years ago but have not really documented it properly. The unit still works fine with all the parts shown below.<\/p>\n\n\n\n

\"\"
Schematic 1: Principal of a super simple step up GM Driver<\/figcaption><\/figure>\n\n\n\n

When the MOSFET Q1 shuts the current through L1 off, a current pulse rushes through D1 which is a standard 1000V rectifier diode. The current charges C2, a high voltage rated 100nF foil capacitor. When the set voltage is reached the Z-diodes regulate it to their limit. The voltage can be lowered by just shorting one or multiple Z-diodes out. In the given case, the voltage will stay at 400V. The diodes should be chosen with a reverse saturation current as low as possible to lower the idle power consumption to a minimum. The current to charge the GM-Tube MUST be limited by a 7-15M resistor R1. When a ionization is detected the GM Tube discharges through R2 into the base of a BC547B NPN transistor. The transistor lets current flow and pulls the pulse output low for a very short time. It is important NOT to use a FET as Q2 as it will be easily be destroyed when the HV builds up at the gate.<\/p>\n\n\n\n

The PWM drive for Q1 and the pulse-out-detector which drives an active buzzer can be both made by using a 555 type timer IC. <\/p>\n\n\n\n

Coming soon: <\/strong>Schematic for GM Driver with 555 timer ICs and Schematic for GM Driver just using one AtTiny microcontroller. Edit: March 24 2022, I have had many other projects since and have not forgotten about this one, there will be an update. <\/strong>Also check out my other projects. <\/p>\n\n\n\n

This is a work in progress…<\/p>\n","protected":false},"excerpt":{"rendered":"

Recently someone asked if it was possible to build a cheap GM-Driver circuit which is a HV source and a pulse output connected to a speaker. When a gamma\/beta\/x-ray is detected by the tube, the unit will make a click noise. I’ve decided to make one only by using very standard parts everyone should be […]<\/p>\n","protected":false},"author":1,"featured_media":138,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-135","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-allgemein"],"_links":{"self":[{"href":"https:\/\/rd-gammaspectra.xyz\/index.php?rest_route=\/wp\/v2\/posts\/135","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/rd-gammaspectra.xyz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/rd-gammaspectra.xyz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/rd-gammaspectra.xyz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/rd-gammaspectra.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=135"}],"version-history":[{"count":0,"href":"https:\/\/rd-gammaspectra.xyz\/index.php?rest_route=\/wp\/v2\/posts\/135\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/rd-gammaspectra.xyz\/index.php?rest_route=\/wp\/v2\/media\/138"}],"wp:attachment":[{"href":"https:\/\/rd-gammaspectra.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/rd-gammaspectra.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=135"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/rd-gammaspectra.xyz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}