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Post #1 assumption was "circuit is useless". Having shown that it can serve a purpose doesn't necessarily mean that it also has a useful application. The application range was never mentioned, unfortunately.

Returning to "how to probe". For high impedance nodes (photo diode, base circuit), you can't use standard probes. Best tool would be a high impedance (FET input) buffer. Question is, do you actually need to probe it in operation?

[QUOTE="FvM, post: 1790843, member: 152255"] Post #1 assumption was "circuit is useless". Having shown that it can serve a purpose doesn't necessarily mean that it also has a useful application. The application range was never mentioned, unfortunately. Returning to "how to probe". For high impedance nodes (photo diode, base circuit), you can't use standard probes. Best tool would be a high impedance (FET input) buffer. Question is, do you actually need to probe it in operation? [/QUOTE]

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