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Old 1st March 2012, 12:37 PM   #1
Elvee is offline Elvee  Belgium
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Default UcD on half a shoestring

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.
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Old 1st March 2012, 12:44 PM   #2
norazmi is offline norazmi  Malaysia
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DC component 16.81!! watch it
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Old 1st March 2012, 02:41 PM   #3
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by norazmi View Post
DC component 16.81!! watch it
That's upstream of the output coupling capacitor, obviously
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Old 1st March 2012, 03:12 PM   #4
norazmi is offline norazmi  Malaysia
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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.
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Old 2nd March 2012, 06:13 AM   #5
markusA is offline markusA  Sweden
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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?
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Old 2nd March 2012, 07:26 AM   #6
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Now it's half a shoestring!? Gotta give ya props, Elvee. You're not a loafer! <rimshot>
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Old 2nd March 2012, 11:22 AM   #7
Elvee is offline Elvee  Belgium
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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.
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Old 2nd March 2012, 04:23 PM   #8
norazmi is offline norazmi  Malaysia
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Yup Elvee, same here hot, hmm.. i like N-ch only ucd maybe can be optimized and stabilized.
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