X100 amplifier with high input Z

217

03:46:05

N MOSFET and PNP transistor amplifier. MOSFET permits high input impedance. Uses AC and DC negative feedback to determine gain. About 6 @ DC and about 100 for AC.

published 9 years ago

2ctiby

9 years ago

Nice, here's a cmos output variation 1.6A @ 22kHz http://everycircuit.com/circuit/5262112373080064

hurz

9 years ago

The circuit from @gasboss775 is a nice little preamplifier, my 2cents. But how the fuck is this related to an loudspeaker killer circuit with relay like modeled mosfets messed by Mr 2cent? We are all very impressed about this messy design, which supposed to be moved in category "trash for fun"?

zorgrian

9 years ago

The nmos and pnp combination is useful for a high Z input preamp. I had forgotten about this configuration. As @hurz points out using expletives, there is no real need for additional science fiction

2ctiby

9 years ago

Not science fiction, just exploring mosfet amplifiers...I have now just adjusted the mosfets slightly....no claims intended, simply exploration ideas.

gasboss775

8 years ago

I wasnt aware of any categories. I access this using an android version on my tablet. Is the categories feature only available to PC users?

gasboss775

8 years ago

I built a variation of this using a bs170 mosfet and 2n3906 pnp transistor, was able to get open loop gain of 168, but I expect this could be optimised.

gasboss775

8 years ago

I forgot to mention I used a pot to set the input DC bias because of the wide spread in Vgth in real mosfets.

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