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buggies · 24th Jul 2020, 9:16 pm

The small circuit extract below shows a 2N5245 FET with no resistor on the gate. The FET is used as an RF buffer and amplitude modulator.
I can't think of any good reason - thinking 100k to 1M?
There is no "R" number missing from the sequence of components.
The circuit comes from the radiomuseum and I have been unable to locate another on the internet.
Although this refers to the circuit of a Nombrex 41 signal generator, I have picked this forum department as I don't actually have that piece of gear - just rehashing an old biscuit-tin genny.

24th Jul 2020, 9:16 pm	#1
buggies Heptode Join Date: Jan 2009 Location: West Lothian, UK. Posts: 762	JFET sanity check please... The small circuit extract below shows a 2N5245 FET with no resistor on the gate. The FET is used as an RF buffer and amplitude modulator. I can't think of any good reason - thinking 100k to 1M? There is no "R" number missing from the sequence of components. The circuit comes from the radiomuseum and I have been unable to locate another on the internet. Although this refers to the circuit of a Nombrex 41 signal generator, I have picked this forum department as I don't actually have that piece of gear - just rehashing an old biscuit-tin genny. Attached Thumbnails __________________ George