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| Sensitive voltage detector schematic diagram |
The headphones, most likely being stereo units (separate left and right speakers) will have a three-contact plug. You will be connecting to only two of those three contact points. If you only have a ”mono” headphone set with a two-contact plug, just connect to those two contact points. You may either connect the two stereo speakers in series or in parallel. I’ve found the series connection to work best, that is, to produce the most sound from a small signal:
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| Sensitive voltage detector illustration |
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