A simple signal level indicator on IN13. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Radio amateur designer
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The circuit is quite old, but quite simple and may be useful to someone as an indicator of the ULF output signal. In principle, it can also be used as a linear voltmeter by changing the input part.
IN13 is a gas-discharge indicator in the form of a glass tube about 13 cm long. Some modern high-voltage transistor can also be used.
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Publication: N. Bolshakov, rf.atnn.ru
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