This circuit is from a 60's documentation. The capacitance C1 can be between 20 pF and 0.01 uF depending on the generated frequency. Equivalent transistors may be employed.
This 1980s circuit uses components of the era that can be replaced by modern equivalents. For the FET we can...
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This is a traditional version of electroscope with FET. We found it at Popular Electronics. The...