This circuit from Ferranti was released in 1969. It makes use of the company's transistors that admit current equivalents. The input voltage is 30 mV for total deflection. The band pass is 800 kHz.
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...