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This is just a quick adaptation, something I threw into the Circuits Sim for giggles.
I was fixing my Hameg 203-4 Oscilloscope (the dual jfet - part# U440, in channel one had blown - they are as easy to source as rocking horse poo), and took this circuit out of the schematic diagram.
If you'd like to have a look at the original Service manual, go to the elektrotanya site and search for hameg 203-4 (which is obvious, lol)
On a wee side note: there is a hell of a lot that can be learned from reading and implementing circuits found in 'old' analog Lab equipment. Nowadays, it's all done with silicon chip packages, which takes away a huge amount of founding knowledge of how it can be done using standard components, IMHO. Sure, using the silicon packages reduces the total BoM costs, but I do not build marketable devices - I build and do this for myself and to satiate the un-ending hunger for knowledge. (I do this at work too....when not up to my guts in Tube Amps, lol)
Recommended old equipment from manufacturers like Philips (the old stuff was really top notch btw), blaupunkt, telefunken, HP, Rohde & Schwartz, Textronix, BK, and the old Heathkits too. The list goes on and on....
I'm blathering - teaching folk to suck eggs, lol
Be well....enjoy and keep on feeding your Cerebellums :)
p.s. building your own Lab equipment saves money (obviously) but it can also make you more productive.....and creative :)
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