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Old 6th September 2012, 10:00 PM   #91
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Originally Posted by juma View Post
Hi Wrench,
here is my take on "turning a (MOS)FET into a SIT/triode". Fair Zin, low Zout, BW(-3dB)=1MHz, rail-to-rail swing (almost), high PSRR, Id about 15mA, sounds wonderfull - what more could a man want ?

Built, tested, measured (except for THD) - here is the schematics:

Hm..very interesting What is the gain of this circuit?
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Old 7th September 2012, 10:45 PM   #92
juma is offline juma  Germany
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Originally Posted by supernet View Post
Hm..very interesting What is the gain of this circuit?
Already explained in posts #57, 63, 68, 76...
Pics are nice, but reading is still essential
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Old 27th December 2012, 05:18 AM   #93
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Taking this thread a little further, here's a circuit that uses a "fetfakesit" as an element in a feedback amp for line stage duty. I just finished bread boarding this circuit using a DN2530N3 current source instead of the perfect one used in the simulator, and a GaAsP deep red LED (~1.6 Vf) in the source of the ZVP3306A (simulated via a voltage source and a 1.5 ohm resistor). Voltage levels are very similar to those of the simulation shown. Distortion? Sound? We'll see, as soon as I build up the rest of the board, as it's the stripped carcass of one of my early RIAA/lineamp "preamp-on-a-board" efforts.
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Last edited by wrenchone; 27th December 2012 at 05:26 AM.
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Old 30th December 2012, 12:05 AM   #94
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This is the setup I'll be testing, as soon as I can throw the rest of it together. I'll probably throw things together into a box and change sources by shifting patch cords around, instead of having to do all the baroque wiring needed for the usual rotary source selector switch. At present. all the various elements have the proper quiescent voltages. What remains is to populate the shunt regulator and mount the board in a box with the right connectors.
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