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Tag: geiger counter

New items added to products

New items added to products

I have added quite a few items to the products recently, so I thought I would list some of them here:

      Description                Device ID                  Price  Link
  • Dual N-CH 60V 4A MOSFET    S4DNF60L  STS4DNF60L       $0.85  MOSFETs
  • N-CH 60V 80A MOSFET        FDB070 FDB070AN06A0        $1.00  MOSFETs
  • N-CH 55V 80A MOSFET D²PAK  STB80NF55-08T4 B80NF55-08  $1.50  MOSFETs
  • Nichia 110 Lumen 1 Watt    NCSL119T                   $0.45  Nichia 119 LEDs
  • Nichia 120 Lumen 1 Watt    NCSW119T                   $0.50  Nichia 119 LEDs
  • Nichia 130 Lumen 1 Watt    NCSW119AT                  $0.55  Nichia 119 LEDs
  • OSRAM 105 Lumen 1 Watt LED LUW W5AM                   $1.75  OSRAM LEDs
  • Nichia RGB LED             NSSM016GT                  $0.85  LEDs
  • Kingbright RGB LED         Kingbright RGB LED         $0.25  LEDs
  • Neodymium Diametric Disc N35H 6x2.5mm 120C            $1.50  AS5040 AS5045 AS5035 AS5043 Sensor Magnets

We will be adding a N35EH version of the Neodymium Diametric Disc 6×2.5mm sensor magnet that will operate at 200C in the next few weeks

Also note that we will be recieving PCBs for the ION Chamber Kit in about a week. We have improved the ion chamber radiation detector kit design to allow use of any can material so no more need to look for tins ( use any old can, like a tuna can for your ion chamber), also improved the adjustment of zeroing the kit. We will put the PCBs and kits up on the site when the instructions are rewritten to accommodate changes to the design. We also acquired a large supply of uranium Vaseline glass beads to use as low radioactive sources for the kits. see kits and supplies for radiation detection here: Radiation detection






Geiger Counter Audio Circuit Board

Geiger Counter Audio Circuit Board

This post shows the audio circuit portion of the radiation detector in the video, for the simple high voltage power supply portion of the circuit click here

Quick overview:
Q1/Q2 form a one shot that stretches the pulse generated by the Geiger tube output that is coupled by the 1nF 1KV capacitor. The pulse coming from the Geiger tube is very narrow and would not produce a nice sounding click if we just amplified it.

Q3/Q4 form the audio amplifier, the 500 ohm potentiometer connected to the collector of Q4 is for adjusting the volume of the clicks. The 8 Ohm speaker can be any speaker. I used a speaker from a cellular phone ringer and I have used one from an old PC case.

There is an optional meter out that can be connected to an analog meter circuit that will average the counts using a rc circuit (to be discussed later if there is interest).

There is an optional pulse output that will put out a pulse that will pull-down (go from 3V to 0V back to 3V) for every click that can be used for connecting to a micro-controller so that a counts per second display can be used. This output can be utilized if the logic level NMOS and R8 are populated (to be discussed later if there is interest). Also if you do not populate the R8 resistor you can use the fet as a level translator, for instance if you are using a micro-controller that needs 5v logic levels. Connect the fet drain to the micro-controller line with a 5V pull-up resistor and you have an instant level translator.

For a full size image click this image, then click image on the following page:

This is the circuit for the audio board of the Geiger counter in this video