Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => AmpTools/Tech Tips => Topic started by: six el six on March 15, 2013, 03:54:39 pm
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There's a thread from 2011 titled ---- Re:"breadboarding" amps?
Dummyload has a breadboarding setup with Tyco wire clamp screws for making connections.
I need to know what the right "barrier strips" are for those clamps.
It's in reply #7 on that thread.
Thanks,
six.
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i sent you an email with what i believe is the correct part for the barrier strips that have the clamp screw. the clamp screw in that thread is also the one i sent you in a private message. unless the part has changed, they claim that they fit the .375" spaced barriers. if you have a look at the specs, they DO FIT SERIES RSB6B SOCKET which are .437" spaced barrier. for sure they DON'T fit the .325" spaced barrier strips. TE's catalog is VERY confusing.
long of the short, with the TE screws below,
http://www.alliedelec.com/search/productdetail.aspx?sku=70088665#tab=specs (http://www.alliedelec.com/search/productdetail.aspx?sku=70088665#tab=specs)
then you should use TE double row barriers in SERIES 1546670 or 1546671.
10 poles
http://www.alliedelec.com/search/productdetail.aspx?SKU=70088630 (http://www.alliedelec.com/search/productdetail.aspx?SKU=70088630)
14 poles
http://www.alliedelec.com/search/productdetail.aspx?SKU=70088631 (http://www.alliedelec.com/search/productdetail.aspx?SKU=70088631)
mouser catalog page:
http://www.mouser.com/ds/2/418/NG_CS_1308389_BARRIER_STRIPS_0607-144787.pdf (http://www.mouser.com/ds/2/418/NG_CS_1308389_BARRIER_STRIPS_0607-144787.pdf)
scroll down to page 156 for .375" spaced barrier strips. again online components show they have stock (388 pieces) on the 20 pole part.
scroll down to page 157 for the .437" spaced parts. stock for the .437" parts is little to none.
HTH,
--pete
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Hey six,
Just figured I'd share a little research with you guys....
For the sake of safety I took a closer look at the 2 types of terminal strips that I had purchased for my breadboard
The Radio Shack model is the first pic and you can see where the barriers are low enough that if I took my finger and pressed lightly, I could make contact with my skin
The second pic is of a Molex brand strip that I got from Newark, that has much higher barriers, even though all other dimensions are similar
http://www.newark.com/jsp/search/productdetail.jsp?SKU=72K2063 (http://www.newark.com/jsp/search/productdetail.jsp?SKU=72K2063)
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> if I took my finger and pressed lightly, I could make contact with my skin
So don't do that.
Anyway, there's leads coming off those screws. Bus leads can be insulated, but resistors and caps will generally have bare-naked leads, very touch-able.
If the amp is not completely enclosed, it is just as safe (not!) as a basket full of deadly serpents. Except you DO have a Master Switch which de-fangs ALL the snakes (and status lights/meters to verify that the switch really killed all power).
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it is just as safe (not!) as a basket full of deadly serpents.
exactly. this thing is like smoking in an ammo dump. do be careful. the taller barriers are major pain in the youknowwhere. it is deadly so treat it like a loaded firearm AT ALL TIMES. you can put lids on it, whatever, NEVER lose that thought. EVER.
i have been playing with high voltage for over 3 decades, NEVER get in a hurry, if you do, you make mistakes, if you make a mistake with this thing, it could be your last.
when the board is hot, keep one hand in your belt-loop if you're making volume, tone adjustments. NEVER make changes when the board is hot.
common sense, caution, and patience - USE THEM or get bit.
respectfully,
--pete
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A raised edge (for the whole bread-board) and a transparent lid in plastic, hinged on the back, with a security switch operated by the lid ?
May be not very practical :rolleyes: but also may be more safe :dontknow:
K
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Thanks guys,
I am listening :thumbsup:
I just hope that anyone else that tries this is listening as well...
Ever since we had a 460V 3phase safety switch fail and arc 3 holes through the wall I have gained an enormous respect for electricity.....the fact that my friend still has use of his hand is amazing
My experience with welding machine testing is my grounds for believing that I am responsible enough to own one of these
My post was simply meant to show my findings, and I hope it shows you that I am concerned about safety
Thanks again for caring enough to take the time to warn EVERYONE WHO CONSIDERS BUILDING ONE OF THESE...
I've got plans for my retirement :icon_biggrin:
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> we had a 460V 3phase safety switch fail and arc 3 holes through the wall
Yes, a 10,000++ Watt fault is impressive.
But your _heart_ is nowhere near as tough as that wall. Less than 1 Watt through your chest (hand-to-hand or hand-to-foot) is potentially lethal.
And there's lots of ways to get a Watt coming out of tube circuitry. In fact the tube-amplifier impedances are generally "favorable" for good body conduction (which is bad for you).
For the record: 40 years back I took a 600V jolt from tip of little finger to heel of the same hand. That finger is still numb. Obviously the same jolt to the *other* hand, through my heart, would have been real-real-bad.
BTW: I'm working on the fusebox in my cellar. I found a rubber work-mat, similar to horse-mats sold at Tractor Supply, and stand on it. I probably should Ohm it out: rubber is usually cut with carbon which is conductive.
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BTW: I'm working on the fusebox in my cellar. I found a rubber work-mat, similar to horse-mats sold at Tractor Supply, and stand on it. I probably should Ohm it out: rubber is usually cut with carbon which is conductive.
Put a nice dry piece of scrap plywood under it that extends past the matts edges a few inches. Couldn't hurt.
Brad :icon_biggrin:
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For the record: 40 years back I took a 600V jolt from tip of little finger to heel of the same hand. That finger is still numb. Obviously the same jolt to the *other* hand, through my heart, would have been real-real-bad.
Thanks for sharing that...I'm sorry to hear it....
I got mine by trying to size up a nut on a voltage changeover board that was energized with 460
Made my hand shake for 2 days,,,and taught me more than 12 years of public school..........I got off easy