High power Zener diode ?

[john]

Looking for a Zener diode of 13W for replacement of a faulty component
in a legacy system. Could anyone points to me where I can get one ?

Alternatively, can I use some small power Zener diode, together with a
transistor, to functionally replace the high power Zener diode ? It
seems I saw such circuit before, but cannot recall exactly how to do it
and is it reliable!

 

[Watson A.Name - \"Watt Su]

"john" <johnjohn9191@hotmail.com> wrote in message
news:cl37p7$mtu2@imsp212.netvigator.com...

Looking for a Zener diode of 13W for replacement of a faulty component
in a legacy system. Could anyone points to me where I can get one ?

http://www.nteinc.com.

[snip]

 

[mike]

john wrote:

Looking for a Zener diode of 13W for replacement of a faulty component
in a legacy system. Could anyone points to me where I can get one ?

Alternatively, can I use some small power Zener diode, together with a
transistor, to functionally replace the high power Zener diode ? It
seems I saw such circuit before, but cannot recall exactly how to do it
and is it reliable!

I've been using a small diode with a big transistor as a shunt regulator
on a motorcycle. Can't get much more abusive environment than that.
Biggest problem with the technique is that it looks like a resistor
below the threshold due to the bias resistors.
mike

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[petrus bitbyter]

"john" <johnjohn9191@hotmail.com> schreef in bericht
news:cl37p7$mtu2@imsp212.netvigator.com...

Looking for a Zener diode of 13W for replacement of a faulty component in
a legacy system. Could anyone points to me where I can get one ?

Alternatively, can I use some small power Zener diode, together with a
transistor, to functionally replace the high power Zener diode ? It seems
I saw such circuit before, but cannot recall exactly how to do it and is
it reliable!

The schematic below shows a very common high power zener replacement. (View
with fixed font). The zener voltage of the should be about 0.7V below the
required replacement. The transistor will need a heatsink otherwise required
by the power zener it replaces. The value of the resistor depends both on
the zener and the transistor you use and may need some
calculation/experimenting.


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petrus bitbyter




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