Re: Can you test a Voltage Reg. (MC7812CK) like a Transistor ?

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XYQE > Pinball > Re: Can you test a Voltage Reg. (MC7812CK) like a Transistor ? 1 April 2008 08:22:06

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Re: Can you test a Voltage Reg. (MC7812CK) like a Transistor ?
Gpe 1 April 2008 08:22:06
	No - these cannot be tested this way. The 7812K is actually a 3-legged integrated circuit ... with many internal components. Only way to test these is to test them in a live circuit. Note -- this style (TO-3) of 7812 has become somewhat hard to find. Hopefully, the one you have is ok. -- Ed "Scott" <eagle4@zoominternet.net> wrote in message news:052bb8e1-33bc-4c1b-97d8-0d66fff58342@p25g2000hsf.googlegroups.com... If I were to remove this part...is there a way to test it ? Red on this leg...black to the case...then switch...and you should get this for a reading on your DMM. Something like that, you know something simple for the electronicly challanged. The voltage reg. in on the PS for my Volcano's Sound/Speech board and has a metal case like a 2n5875 transistor. Thanks, Scott
		Add comment


Gpe 1 April 2008 08:14:22 [ permanent link ]
	That's not a good cross to the 7812CK but is a cross for the 7812CT. The "T" suffix is a TO-220 package. The "K" suffix is a TO-3 package. These will look like the LM323K voltage regulators as used in the older Bally and Stern boards. -- Ed "Steve Kulpa" <stevekulpa@yahoo.com> wrote in message news:7cce9ac3-fbe3-489b-beea-e34489acd46d@x41g2000hsb.googlegroups.com... Mouser sells something that's crossed to it: http://tinyurl.com/2tz2cx steve --- Steve Kulpa (cargpb10) Hermitage, TN http://www.geocities.com/stevekulpa/faces/rgpidx.htm - Faces http://www.geocities.com/stevekulpa/pinball.htm - Pinball On Mar 31, 9:31 pm, Scott <eag...@zoominternet.net> wrote: Thanks for the reply Ed...even if it wasn't the one I wanted to read. I was hoping you would tell me that you had another part # for this item on your site and that is why I couldn't find it I didn't have any +12 at my Sound/Speach board, and I traced it back to the voltage reg.. I have just over 30+ volts dc going into the one leg, but nothing coming out of the other leg. The input leg also has continuity with the case. I guess I'll start looking. Do you plan on getting any Contact Extracton Tools in anytime soon? (11-03-0016) Thanks, Scott
		Add comment


Gpe 1 April 2008 08:18:21 [ permanent link ]
	"Scott" <eagle4@zoominternet.net> wrote in message news:cadf4fea-22df-4431-906a-2e168b27e07b@2g2000hsn.googlegroups.com... Thanks for the reply Ed...even if it wasn't the one I wanted to read. I was hoping you would tell me that you had another part # for this item on your site and that is why I couldn't find it I didn't have any +12 at my Sound/Speach board, and I traced it back to the voltage reg.. I have just over 30+ volts dc going into the one leg, but nothing coming out of the other leg. The input leg also has continuity with the case. I guess I'll start looking. Do you plan on getting any Contact Extracton Tools in anytime soon? (11-03-0016) Thanks, Scott The 7812K / 7812CK is a tough critter to find. Although I don't like their packaging practices (maybe they've changed over the years) -- Jameco does seem to have a few. Look for 7812K (LM340K-12). I don't know when I will be restocking the 11-03-0016. Everytime I go to buy them - they go thru another price increase. These used to be $2 each... now are about $10 each... kinda sad for a simple piece of stamped steel. -- Ed
		Add comment


Gpe 1 April 2008 08:22:06 [ permanent link ]
	Whoa! What the heck is ST-Micro doing with their part numbering?!?! "T" suffix is typically used for TO-220 packages and "K" is typically used for TO-3 packages. ST trying to confuse us all -- they now use "V" for TO-220's and "K" for TO-3's. It looks like Steve is right -- the L7812CT is what you want. Just don't get the LM7812CT -- that one will be the wrong package. -- Ed "Steve Kulpa" <stevekulpa@yahoo.com> wrote in message news:7cce9ac3-fbe3-489b-beea-e34489acd46d@x41g2000hsb.googlegroups.com... Mouser sells something that's crossed to it: http://tinyurl.com/2tz2cx steve --- Steve Kulpa (cargpb10) Hermitage, TN http://www.geocities.com/stevekulpa/faces/rgpidx.htm - Faces http://www.geocities.com/stevekulpa/pinball.htm - Pinball On Mar 31, 9:31 pm, Scott <eag...@zoominternet.net> wrote: Thanks for the reply Ed...even if it wasn't the one I wanted to read. I was hoping you would tell me that you had another part # for this item on your site and that is why I couldn't find it I didn't have any +12 at my Sound/Speach board, and I traced it back to the voltage reg.. I have just over 30+ volts dc going into the one leg, but nothing coming out of the other leg. The input leg also has continuity with the case. I guess I'll start looking. Do you plan on getting any Contact Extracton Tools in anytime soon? (11-03-0016) Thanks, Scott
		Add comment

XYQE > Pinball > Re: Can you test a Voltage Reg. (MC7812CK) like a Transistor ? 1 April 2008 08:22:06

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Re: Can you test a Voltage Reg. (MC7812CK) like a Transistor ?

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