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stupid substitution question.
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crashlander42



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PostPosted: Fri Jul 26, 2013 9:44 pm    Post subject: stupid substitution question. Reply with quote  Mark this post and the followings unread

I'm building a CGS wave multiplier, and only have 4.7v 1W zeners (1N4732). The parts list calls for a 4.7v 400mw zener.

Is substituting a higher wattage zener going to screw anything up?

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PHOBoS



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PostPosted: Sat Jul 27, 2013 2:25 am    Post subject: Reply with quote  Mark this post and the followings unread

nope, it could cause problems if it was the other way around (a circuit that needs 1W and you only have 400mW). but it'll work fine.
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analog_backlash



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PostPosted: Sat Jul 27, 2013 4:02 am    Post subject: Reply with quote  Mark this post and the followings unread

PHOBoS wrote:
nope, it could cause problems if it was the other way around (a circuit that needs 1W and you only have 400mW). but it'll work fine.

Hi PHOBoS, your answer has driven me to madness (a very short journey...). I'm sure that I read a reply to a thread very recently which said that there was a problem replacing 400mW zeners with 1W ones, but of course, I can't find it now Mad . I think it was along the lines of the optimum reverse currents of the two being different, affecting the "regulated" output. It may well have been (a) wrong or (b) a hallucination. Up until then, I was sure that replacing a 400mW with a 1W zener would make no difference.

If anyone remembers this (possibly imaginary) thread, please let me know!

Gary
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PHOBoS



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PostPosted: Sat Jul 27, 2013 4:15 am    Post subject: Reply with quote  Mark this post and the followings unread

you might be right, I know they need a certain current to work properly but am unware that there is a difference between 400mW and 1W.
But I bet someone here can confirm it.

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analog_backlash



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PostPosted: Sat Jul 27, 2013 8:13 am    Post subject: Reply with quote  Mark this post and the followings unread

Just worked it out - I saw it on the muffwiggler forum:

http://www.muffwiggler.com/forum/topic-86024.html&highlight=zener

I don't know if this link will work, because I always have problems with these links. Anyway, the quote from daverj says:

"There is a slight difference when substituting a 1W Zener in place of a 400mw Zener. The Zener voltage for each is defined at a specific current. Besides the maximum power that the part can handle (the wattage), the test current used to find the Zener voltage is typically higher on the 1W Zener.

What that means is that at a lower current the higher wattage Zener will typically have a lower than rated Zener voltage.

For example, the 1N4734A (1W) has a Zener voltage of 5.6 volts when 45ma is flowing through it. While the 1N5232B (0.5W) has a zener voltage of 5.6 volts when 20ma is flowing through it. Lower the current on either one and the actual voltage across it will be a bit lower."

I wasn't imagining it after all Very Happy . I don't think that it will make a huge amount of difference by the sound of it.

Gary
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PHOBoS



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PostPosted: Sat Jul 27, 2013 9:02 am    Post subject: Reply with quote  Mark this post and the followings unread

ah, thanks. learned something again Smile
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Blue Hell
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PostPosted: Sat Jul 27, 2013 9:05 am    Post subject: Reply with quote  Mark this post and the followings unread

analog_backlash wrote:
I don't know if this link will work


Prolly not ... well .. for members only:

Quote:
IMPORTANT NOTICE - In order to conserve server resources for active members, the forum permissions have been changed so that only logged-in users may now browse the site. At any given time around half our traffic has been coming from "guest" users, so I'm hoping this makes a significant difference in terms of server performance.


Too bad - I liked browsing there at times Rolling Eyes

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elmegil



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PostPosted: Sat Jul 27, 2013 11:14 am    Post subject: Reply with quote  Mark this post and the followings unread

Jan, the limits haven't solved the problem, so hopefully eventually when they find the REAL problem they'll open it back up for guests.
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crashlander42



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PostPosted: Sun Jul 28, 2013 12:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

analog_backlash wrote:


What that means is that at a lower current the higher wattage Zener will typically have a lower than rated Zener voltage.

For example, the 1N4734A (1W) has a Zener voltage of 5.6 volts when 45ma is flowing through it. While the 1N5232B (0.5W) has a zener voltage of 5.6 volts when 20ma is flowing through it. Lower the current on either one and the actual voltage across it will be a bit lower."

I wasn't imagining it after all Very Happy . I don't think that it will make a huge amount of difference by the sound of it.

Gary


That's what i was worried about. I've going to use them and cross my fingers.

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analog_backlash



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PostPosted: Tue Aug 06, 2013 4:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

Blue Hell wrote:
analog_backlash wrote:
I don't know if this link will work


Prolly not ... well .. for members only:

Quote:
IMPORTANT NOTICE - In order to conserve server resources for active members, the forum permissions have been changed so that only logged-in users may now browse the site. At any given time around half our traffic has been coming from "guest" users, so I'm hoping this makes a significant difference in terms of server performance.


Too bad - I liked browsing there at times Rolling Eyes


Just in case you haven't read it Jan, muffwigglers now says "We will be restoring guest browsing again in the next day or two as well." Hopefully, this will be the case. I mainly registered with them so that I could look at the links other people had posted here. I much prefer e-m (what a creep I am Very Happy ).

Gary
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Blue Hell
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PostPosted: Tue Aug 06, 2013 4:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

Ah cool.

creeps? where? Laughing

Anyway, hope they solved the problems then, and thank you for telling me.

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elmegil



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PostPosted: Tue Aug 06, 2013 6:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

That message has been up more than a couple of days, so I suspect Muff is running behind on that promise, but things ARE much better over there most of the time. There are occasionally slowdowns, but it seems likely that they correlate to the maintenance activities that Muff has added to the server, and they don't seem to be very long lived.
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analog_backlash



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PostPosted: Thu Sep 05, 2013 3:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

Just for info, looks like muffwiggler's finally open to the general public again Very Happy .

Gary
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Blue Hell
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PostPosted: Thu Sep 05, 2013 3:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

Looks like :-)
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