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Old 14th September 2003, 01:24 AM   #1
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Question Which one with lower noise?

zener and gas tube regulator(0A2,0B2...), which one have lower noise level?
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Old 14th September 2003, 02:27 AM   #2
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Zener, especially because you can throw a lot of capacitance across it and it won't explode itself in exactly three seconds (...depending on RC time constant...). It has a positive, not negative resistance characteristic, so is stable. With adequate ratings, it also has more current capability.

For most applications, noise won't matter. If it does, make a circuit with lower PSRR

Tim
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Old 14th September 2003, 08:00 PM   #3
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Hi,

Quote:
zener and gas tube regulator(0A2,0B2...), which one have lower noise level?
If the glowdischarge tube doesn't have to do more than, say 20mA I'd much more prefer the tube over the zener string...

The only decent Zzzzzzeners I know of are the 5 Volters which are rather useless for tubed circuits.

Any noise left on a glow tube is much more spread across the audioband whereas zeners tend to throw alot of HF noise.

While I can hear the unpleasant presence of zeners in a circuit I can't hear any unpleasant sound I could attribute to the glowdischarge regs.

Besides, on a silly sidenote, aren't these glowers absolutely charming to watch in a dimmly lit room?

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Old 14th September 2003, 08:10 PM   #4
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Hi,

With enough 5.4V ones in series, the zeners win. High voltage zeners are noisy and have a poor temperature coefficient.
As Tim says, you can slug zeners with c.

Really, each has it's own set of problems.

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Old 14th September 2003, 08:14 PM   #5
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Hi,

300V with 5.4V zeners would require 55+ zeners in series...or two OA2s.

My choice is made...

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Old 14th September 2003, 09:10 PM   #6
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Or 1 0G3/medium-volt zener, a <pentode RF amp type> and a <pass tube>...

Tim
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