NTE109 good replacement for 1N34A?

M

Mike

Guest
Is the NTE109 a comparable replacement for the 1n34a? I am trying to
build a simple RF probe and can't find a 1N34A localllay, but can get
an NTE109, just wondering if the spaces are as good.
thanks
 
Mike (transtyle@mortimor.com) writes:
Is the NTE109 a comparable replacement for the 1n34a? I am trying to
build a simple RF probe and can't find a 1N34A localllay, but can get
an NTE109, just wondering if the spaces are as good.
thanks
Click to expand...
The only reason you'd see a germanium diode specified is because
the circuit predates silicon diodes, or because the low forward
signal drop is required. That any replacement is a germanium is
the key factor, not the specific part number, in all but a handful
of cases. 1N34s aren't hard to get because it's a hard to get number,
they are hard to get because there is little demand for germanium
diodes. Once you find a germanium diode, you are most of the way there.

Think of a "1N34" not as specifying that specific part, but as code
for a generic small signal germanium diode. It's used because it
traditionally could be had at small suppliers, which meant that it
continued to be specified. I suspect much of the time, you'd not
be getting a "1N34" but whatever they did have handy.

Micahel
 
"Mike" <transtyle@mortimor.com> wrote in message
news:3b0i31dvc02g2m6joq53h326bv7kdovbd1@4ax.com...
Is the NTE109 a comparable replacement for the 1n34a? I am trying to
build a simple RF probe and can't find a 1N34A localllay, but can get
an NTE109, just wondering if the spaces are as good.
thanks
Click to expand...
You didn't say what RF you were going to detect, so it's hard to make a
judgment. Looks okay but for a detector you might consider NTE583 which
is the same as a 1N5711 schottky diode, made for RF detectors, mixers,
etc. The V drop is half that of a 1N914 or 1N4148. The Ge diodes might
be better for HFs but for VHF on up the 1N5711 is a good choice.
 
Mike wrote:

Is the NTE109 a comparable replacement for the 1n34a? I am trying to
build a simple RF probe and can't find a 1N34A localllay, but can get
an NTE109, just wondering if the spaces are as good.
thanks



http://www.danssmallpartsandkits.net/
Click to expand...
 
It will be for HF frequencies - I was curious how the forward voltage
drop of the NTE109 compared to the 1N34, but it sounds like a Ge is a
Ge so maybe doesn't matter.

On Thu, 17 Mar 2005 08:51:44 -0800, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

"Mike" <transtyle@mortimor.com> wrote in message
news:3b0i31dvc02g2m6joq53h326bv7kdovbd1@4ax.com...
Is the NTE109 a comparable replacement for the 1n34a? I am trying to
build a simple RF probe and can't find a 1N34A localllay, but can get
an NTE109, just wondering if the spaces are as good.
thanks

You didn't say what RF you were going to detect, so it's hard to make a
judgment. Looks okay but for a detector you might consider NTE583 which
is the same as a 1N5711 schottky diode, made for RF detectors, mixers,
etc. The V drop is half that of a 1N914 or 1N4148. The Ge diodes might
be better for HFs but for VHF on up the 1N5711 is a good choice.
Click to expand...
 
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