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Carl,
Lovely to see you're back. I have been elsewhere also, but now furiously examining log amplifiers for the input device. Alas!! My dear old 'scope has **** herself. Replacement on the way - hope my old eyes can interprete the pictures.
In the intervening months I have played with the input amplifier. Despite having a leaning towards balanced inputs, I have examined really low-impedance amplifiers - the best by far has been Self's circuit. The damn thing passes square-waves "right up there" - getting into Mhtz regions. This circuit is published in
Electronics World - it presents a noise-figure 15db below an NE5534 - that must be an improvement to be taken on board. If interested, then e-mail me, but I will have to respond with the article via snail-mail.
Has any-one fiddled with Joe Carr's thoughts upon MRI detectors? This concept involves two detectors - their responses are co-examined via a divider function - looks like a very-focussed although an enhanced response emerges. My understanding is that Joe has passed away some months ago. I lament his passing.
Lovely to see you're back. I have been elsewhere also, but now furiously examining log amplifiers for the input device. Alas!! My dear old 'scope has **** herself. Replacement on the way - hope my old eyes can interprete the pictures.
In the intervening months I have played with the input amplifier. Despite having a leaning towards balanced inputs, I have examined really low-impedance amplifiers - the best by far has been Self's circuit. The damn thing passes square-waves "right up there" - getting into Mhtz regions. This circuit is published in
Electronics World - it presents a noise-figure 15db below an NE5534 - that must be an improvement to be taken on board. If interested, then e-mail me, but I will have to respond with the article via snail-mail.
Has any-one fiddled with Joe Carr's thoughts upon MRI detectors? This concept involves two detectors - their responses are co-examined via a divider function - looks like a very-focussed although an enhanced response emerges. My understanding is that Joe has passed away some months ago. I lament his passing.
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