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Old 11th April 2003, 05:26 PM   #1
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Default How does one "breadboard" an amp?

Hi,

I assume breadboarding an amp means building it in a temporary fashion, i.e. not fastening all the components down and not soldering everything. Questions:

* Do you use alligator clip leads for all connections? I guess it would be a god idea to buy a large pack of these. Are there any requirements for minimum wire gauge or anything else?

* I could lay out transformers, resistors and caps on a table or a piece of wood or cardboard. What do you do for tubes and their sockets? Do you leave them standing upright, resting on the socket solder tabs? Do you lay them down on the side? (That seems like a bad idea, to have the tube envelope touching something)

* Anythin else I should know and/or be careful of?

One more question that's kinda related - how should I test noise levels when picking transformer positions and orientation? Let's say I'm trying to check the effect of the power transformer on the output transformer. Obviously, I need to supply AC mains to the power transformer. Do I put a load on the secondary, or leave it unloaded (making sure the wires aren't shorting)? Does it make a difference? Also, what do I do to the output transformer? I have a scope, so the probes go at the two output (secondary) taps, I guess. Does the secondary need something like an 8 ohm load resistor? How about the primary - do I leave that open?

Thanks in advance.

Saurav
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Old 11th April 2003, 05:48 PM   #2
dhaen is offline dhaen  Europe
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Some of us are just animals
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Old 11th April 2003, 06:01 PM   #3
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Default Nice, John!

Except yours is temporary--I'll listen to this for weeks!

Rick
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Old 11th April 2003, 07:11 PM   #4
Joel is offline Joel  United States
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I love your work Rick....
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Old 11th April 2003, 07:27 PM   #5
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OK, this is helping... somewhat I see a combination of hookup wire and clip leads. I also see that having a large workspace helps, but that's obvious. From the pictures, I can't see how the tubes are set up too well. Are the sockets just sitting on the boards?
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Old 11th April 2003, 07:56 PM   #6
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Default Need some help here!

Please don't look at my "breadboard"--very bad and very dangerous!

Others in this forum will post some better pics of decent breadboards--I liked John's though with all those layers of wires!!

What an animal!


Joel,

That really hurts!

Rick
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Old 11th April 2003, 08:01 PM   #7
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Default Breadboards

They do not have to be so rough.
Here is a shot of John Sheerwood's set up.
Lets him make changes and presentable too. The tubing comes apart easily.

Click the image to open in full size.

A look from the bottom

Click the image to open in full size.


There are a few more pictures at his site. Nice for something that is close but you may want to change and are not ready to commit to a chassis yet.
Cheers
Craig Ryder
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Old 11th April 2003, 08:49 PM   #8
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My version

http://www.diyaudio.com/forums/showt...508#post153508
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Old 11th April 2003, 09:16 PM   #9
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Ryder, that "breadboard" looks better than some of my finished projects
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Old 11th April 2003, 10:03 PM   #10
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Seriously, that amp came out very sweet looking....
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