| Author |
Message |
kell
Guest
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 Posted:
Mon Feb 14, 2005 6:00 am Post subject:
Re: Zener Heat |
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You seem to get a big turn-on slapping people's shit.
What I "need" ain't what you got.
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Fred Bloggs
Guest
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| Posted:
Mon Feb 14, 2005 6:10 am Post subject:
Re: Zener Heat |
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Tim M wrote:
| Quote: | All of these things are from suggestions in this thread and not my
"foolish" idea, sir. I don't see you hassling them.
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The foolish idea of using zeners for a 150V voltage drop was your idea.
We know who you are the BTW, shooting your mouth off with all that right
wing born again christian crap. |
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Fred Bloggs
Guest
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| Posted:
Mon Feb 14, 2005 6:11 am Post subject:
Re: Zener Heat |
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kell wrote:
| Quote: | So the series line capacitor is a no-no?
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The problem comes with rating the capacitor and handling surges. For
example, when the LINE is first applied, and it happens to be 170V max
when you flip the switch, there will be a helluva surge through the cap
throwing the full 170V onto the load until it charges up. Now that I
have looked up these NIXIE tubes, it seems they don't require a doubled
line voltage, 180VDC is the required anode voltage. In a pinch you can
stack a primary with the secondary with an international type
transformer with dual primaries and keep the end circuit grounded. It
will be important to fuse both legs of the line and MOV it at 300V
between L-N and L/N-GND. The transformer is not safety rated for this
but it will provide isolation. The LV can plug directly into a 7805, and
the HV goes to the NIXIE anodes.
View in a fixed-width font such as Courier.
..
..
..
..
.. ,----------------------|>|---------------------+-->HV
.. | 1N4007 |
.. | 131VAC |+
.. | TERM 1 -8 |300V
.. ,---------------. ===
.. | | | 10U
.. | o----. | |
.. | 1 | | |
.. | o)|| | |
.. | )|| --o |
.. | )||(o 5 |
.. | )||( |
.. | )||( 6 |
.. | 2 ||| --o |
.. '----o----.|| | |
.. || | 1A .-----|--->LV
.. >--------o----.|| | 50V | |
.. 3 ||| | --FWB-- | |
.. o)|| --o----------------|~ + |----+ + |
.. )||(o 7 | | | 16V |
.. LINE 115VAC )||( 8VAC | -|>|- | === |
.. )||( 8 | | |470U |
.. )|| --o----------------|~ - |----+ |
.. 4 | ------- | |
.. >--------o----. | |
.. T1 | |
.. | |
.. GND >-------------------------------------------------+-----'
.. |
.. ---
.. ///
..
..
.. T1 TRIAD POWER p/n 553-FS16-150
..
.. 2.5VA DUAL PRIMARY 16VAC @ 0.15A CT
..
.. 1.2 x 1.125 x 1.375 inches
..
.. http://www.mouser.com/catalog/621/1302.pdf
..
..
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R.Lewis
Guest
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| Posted:
Tue Feb 15, 2005 12:58 am Post subject:
Re: Zener Heat |
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"kell" <kellrobinson@billburg.com> wrote in message
news:1108339200.620761.94210@o13g2000cwo.googlegroups.com...
| Quote: | You seem to get a big turn-on slapping people's shit.
What I "need" ain't what you got.
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glad you are so sure |
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Frithiof Andreas Jensen
Guest
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| Posted:
Tue Feb 15, 2005 5:53 pm Post subject:
Re: Zener Heat |
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"Tim M" <tym1@spammenot.cwru.edu> wrote in message
news:cul7vv$i8q$1@eeyore.INS.cwru.edu...
| Quote: | I am using multiple diodes because I would like a reliable voltage drop
|
*That* you will not get:
Eventually, one zener will fail stressing the others a bit more so one of
those fail - and directly on the mains too. At least the eventual explosion
of the entire stack and the group-suicide of the IC's should be impressive!
| Quote: | circuit. I am powering multiple ICs (older TTL which draw more current)
some of which require eclcectic operating voltages.
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Use a wall-wart and a custom switcher to generate the special voltages - how
hard can it be?
| Quote: | With limited board space as well, I need to crowd the diodes together.
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Planar transformers can be *very* small - even with mains isolation. |
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