This is a multi-part message in MIME format. ------=_NextPart_000_052B_01C26359.9F0A80A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hi, Roman > > Did I ever sent you the one I made with the MPSA42 that can run from 150 > > volts ?? It also performs beautifully ! > > I would like to see the circuit. :o) It is a pleasure :-) It works nicely and goes all the way from 160 volts downto 12 volts. I tested it for some weeks connected directly to the mains trough a simple rectifier and filter and another one connected to a car battery for the same period. Efficiency is very bad but reliability should be quite nice. Even with all the series resistors I still get 150ma with no heat at all in all test conditions. The ugly and inefficient circuit is attached. :-) It runs nicely, I can assure that. I tested it in all conditions I could simulate and regulation and efficiency is poor but it makes very little noise and should be quite reliable. There should still be a prototype running inside a train for some months with it and nobody called to say it stoped :-) > The 3-tran circuit will handle continuous short > circuits and all overload conditions. Thanks a lot.. I will surely try it out as I did with the others. I will surely find a nice product to put it in someday ;-) When that happens you can be sure I will get you a nice bottle of Champagne :-) What brand would you prefer ? Does that satisfies the "hippyware" aggrement ? ;-) > Re your over voltage question and possibility of a > shorted switching transistor, I would just use a small > fusible resistor 0.33 ohms etc in series with the > input voltage. This will save your $100 equipment! :o) > -Roman You mean with a zener or something else at the output to clamp the high voltage and make the fusistor open, right ? Am I missing something ? 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