How to replace the transformer in this Geiger Counter?
Please the schematic:
Can someone tell me how the principle of high voltage generation here is called? And what the relation of the windings is if I would want to make a replacement.
Thanks in advance.
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M$5 Answers
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M$You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$
Voltage-In / Voltage-Out = Windings-In / Windings-out
sorry I can't help you any further, I just don't have experience with GM's
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M$First, please be very careful with this. The capacitor can hold a charge long after the battery is removed. It's enough to kill you. If you are not completely familiar with how to discharge -- and keep discharged -- the capacitor, or if you cannot find a friend with this knowledge, you're better off walking away from this.
Next, are you sure the transformer is bad and not Q3? Unless you are certain, that transistor is also a prime suspect.
The circuit is a astable multivibrator which drives a step-up transformer, followed by a rectifier and filter. In whole, it's called a DC-to-DC converter.
The transistor circuit converts the battery's DC to AC which the transformer needs. The transformer step up the 3 volts to over 400 volts. The rectifier re-converts the AC to DC, and the filter smooths out the ripples in the DC.
End to end, the DC converter converts "smooth" low voltage to "smooth" high voltage because the Geiger tube won't work on just 3 volts. You could, in fact, put 150 or so 3-volt batteries in series to make a 450-volt DC battery and this would work. DON'T do that, however. You'll have the voltage right, but available current will kill you on contact.
So, if it's really the transformer that's bad, carefully examine it and note any numbers. Search them on the Internet and see if you can't find a direct replacement.
It's a neat circuit, and if you simply cannot find the transformer you can built a voltage multiplier circuit with new components and get the job done that way. I have no idea what the counter is worth, so I can't say at what point you should just buy a new one.
Again, whatever you do, please be very careful.
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M$
