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25th November 2010, 11:33 AM
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#1 |
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diyAudio Member
Join Date: Jan 2003
Location: Milwaukee, WI
 
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Discrete low current HV supply
Built this, this evening...
  Main switch is a 2N4401. Draws about a watt at 15V, making 60-120V at up to ~1.5mA, with pitiful efficiency (but it's only a watt, so who cares). Regulation is extremely good, thanks to the TL431's high gain. I built it for avalanche pulse generator experiments, but I'm posting it here as it would be excellent for a small tube preamplifier for battery, automotive or "wall-wart" operation. Tim
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See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!" |
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25th November 2010, 04:51 PM
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#2 |
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diyAudio Member
Join Date: Sep 2005
Location: in Slovenia :)
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cool!
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27th November 2010, 01:13 AM
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#3 |
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diyAudio Member
Join Date: Sep 2010
Location: Melbourne
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That is a novel construction technique, nice ground plane.
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27th November 2010, 04:39 AM
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#5 |
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diyAudio Member
Join Date: Jan 2003
Location: Milwaukee, WI
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As recommended by Jim Williams, so you know it's good :P Not really necessary for such a circuit, but it goes with said pulse generator's styling (where the RF performance *is* needed!).
Tim
__________________
See my Electronics webpage -- the home of Vacuum Tube Drag Racing. The key to being a successful Audiophile: "I reject your reality and substitute my own!" |
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28th November 2010, 09:44 AM
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#6 |
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diyAudio Member
Join Date: Sep 2006
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I often use 2-transistor converters, same sex or complementary to create supplies from a single cell or to light an LED.
The same principle can be used for higher voltages, see extrapolation. The efficiency is ~ 80%, not very good by today's standards but not catastrophic either. PS This type of converter can also be used for applications like this one: When you need +/- 15VDC and have only one pole at power levels up to ~500mW (higher with Zetex superbeta transistors) Last edited by Elvee; 28th November 2010 at 09:57 AM. |
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