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Elvee 1st March 2012 12:37 PM

UcD on half a shoestring
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So, you thought it was impossible to do simpler than 4 transistors?

Here is the 3 transistor version.

OK, performances are a bit on the weak side, but it's just the beginning, and I am sure that you, clever guys, will better that.

Note that this one has only been tested in sim (so far).

And as a bonus, it uses only N-channel MOSFETs: not even necessary to perform a transgender operation.

norazmi 1st March 2012 12:44 PM

DC component 16.81!! watch it

Elvee 1st March 2012 02:41 PM


Originally Posted by norazmi (
DC component 16.81!! watch it

That's upstream of the output coupling capacitor, obviously

norazmi 1st March 2012 03:12 PM

u can try with breadboard, try to measure it. I`ll also trying to simulate ur circuit, let see if the mosfet heat or not.

markusA 2nd March 2012 06:13 AM

Love the simplicity. :)
I can't help wondering if there's a way to clean it up (improve performance) and still keep the kiss approach?

sofaspud 2nd March 2012 07:26 AM

Now it's half a shoestring!? Gotta give ya props, Elvee. You're not a loafer! <rimshot>

Elvee 2nd March 2012 11:22 AM

I have tried to physically test it, but this one is a disappointment: it doesn't work as in the sim.

The self-oscillation isn't strong and healthy enough, which means the circuit takes a huge quiescent current (1.6A), and as a result, the transistors become boiling hot in a matter of seconds.

OK, maybe it has something to do with the breadboarding, which is not ideal for this kind of circuits, but the other one worked without problem in the same conditions.

norazmi 2nd March 2012 04:23 PM

Yup Elvee, same here hot, hmm.. i like N-ch only ucd maybe can be optimized and stabilized. :D

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