Re: TIP50 for HT regulator

flipper wrote:
On Wed, 23 Jul 2008 10:00:28 -0500, John Byrns <byrnsj@xxxxxxxxxxxxx>
wrote:

In article <4prc84lsgbk0dvoorirkcnrk888gemis2v@xxxxxxx>,
flipper <flipper@xxxxxxxx> wrote:

On Tue, 22 Jul 2008 23:34:17 +0100, Ian Thompson-Bell
<ruffrecords@xxxxxxxxxxx> wrote:

At a local ham fest I picked up 100 of 150V zeners so I thought I would build myself a stabilised 300V HT supply - not big current, just enough for my mic pre projects. So, I have been looking at high voltage transistors and came across the TIP50 which are rated 400/500V. I picked this oas it the only one whose number I vaguely recognise.
Watch out for SOA and turn on surge into downstream caps. They're good
for about 45mA DC at 300V.

Has anyone used these for HT supplies or what else do you use?
STP2NK60Z is my sort of 'all purpose' N-MOSFET. 600V with built in
gate zener protection and relatively inexpensive. A few pennies less
than a TIP50 but more current and no base drive.

For power supplies I tend to use them as cap multipliers (note that a
cap multiplier is not a reservoir) and screen regulators. I've also
used them as source (cathode) followers when short a triode.
I'm looking for a capacitance multiplier design to replace the inductors in the power supply for a Single Ended amplifier, are you willing to share your capacitance multiplier design?

Sure. I used it on the headphone amp breadboard and, as fortune has
it, it's posted on the website.

http://flipperhome.dyndns.org/headphone%20amp.htm

Two ways to do the resistor divider. One is from input V to ground but
with large voltages you can end up with difficult values so I run it
from input to output.


If you combine it with a regulator, using zeners in the grounded leg of the pot divider, you avoid difficult resistor values and get a fixed output voltage too.


You want enough drop to cover MOSFET gate threshold, input ripple, and
supply droop. If I remember correctly that one has about 10V across
it.

Regards,

John Byrns


Cheers

Ian
.

Relevant Pages

  • Re: TIP50 for HT regulator
    ... flipper wrote: ... I'm looking for a capacitance multiplier design to replace the inductors in the power supply for a Single Ended amplifier, are you willing to share your capacitance multiplier design? ... If you combine it with a regulator, using zeners in the grounded leg of the pot divider, you avoid difficult resistor values and get a fixed output voltage too. ...
    (rec.audio.tubes)
  • Re: TIP50 for HT regulator
    ... flipper wrote: ... I'm looking for a capacitance multiplier design to replace the inductors in the power supply for a Single Ended amplifier, are you willing to share your capacitance multiplier design? ... If you combine it with a regulator, using zeners in the grounded leg of the pot divider, you avoid difficult resistor values and get a fixed output voltage too. ...
    (rec.audio.tubes)
  • Re: TIP50 for HT regulator
    ... For power supplies I tend to use them as cap multipliers (note that a ... I'm looking for a capacitance multiplier design to replace the inductors ... John Byrns ...
    (rec.audio.tubes)