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  • May 17, 2022 at 7:20 am #29336
    R_A_Ghosh
    Participant

    I have a 2xAA battery operated system that generates 500V for geiger counter. However for being 3V driven system the audio click sound for the system is very low. Mine is a basic transistor based driven system using a 3V passive buzzer. Can anyone please suggest how to get loud clicks in a 3V driven system ?

    May 21, 2022 at 11:54 am #29337
    Wolferl
    Moderator

    Hi Ghosh,

    Can you show what the circuit looks now?
    I’m happy to help you out, but I need to know from where we’re starting.

    Cheers,
    Wolferl

    July 6, 2022 at 2:01 pm #29349
    R_A_Ghosh
    Participant

    Attached schematic is driven by 3V or two AAA batteries. Trying to interface a buzzer through a transistor switch from gm tube pulse but buzzer output is feeble.
    Getting proper counts though.

    Attachments:

    1. Figure-8-Front-end-circuit-of-a-diy-Geiger-Counter-kit-.png

    July 10, 2022 at 4:39 pm #29351
    Wolferl
    Moderator

    OK, if I understood you right, you want to connect a passive unpolarized buzzer to the “pulse output” of your circuit diagram, correct?
    First, you need to test if the buzzer is loud enough if you just feed it with the 2 batteries power (3 volts).
    If it is, put that buzzer instead of R3 and you are good to go.
    If not, you’ll need a second transistor stage that inverts the “pulse output” via a 10k resistor and an additional NPN transistor. Connect the buzzer between the collectors of the two transistors. That will almost double the voltage across the buzzer.

    I do not really like that HV generation circuit, since it produces unregulated HV. That will lead to varying sensitivity and spurious clicks.
    Do you have an oscillscope to take measurements?

    Cheers,
    Wolferl

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