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MrBungle · 21st Jan 2018, 5:21 pm

I found out what it was in the end. I swapped the load resistor on the FET out for an inductor. Needed a current source really and the resistor that was there wasn't particularly ideal at the high end of the frequency range.

I'm doing this SMD next time. The average 1/4W carbon films aren't that great at that end of the frequency spectrum!

21st Jan 2018, 5:21 pm	#100
MrBungle Dekatron Join Date: Jun 2016 Location: London, UK. Posts: 3,687	Re: Spectrum Analyser I found out what it was in the end. I swapped the load resistor on the FET out for an inductor. Needed a current source really and the resistor that was there wasn't particularly ideal at the high end of the frequency range. I'm doing this SMD next time. The average 1/4W carbon films aren't that great at that end of the frequency spectrum!