79L12 datasheet, 79L12 pdf, 79L12 data sheet, datasheet, data sheet, pdf, Wing Shing Computer Components, Negative-Voltage Regulators. Changed layout of National Data Sheet to TI format. 79L LM79L12ACZ/ NOPB. ACTIVE. TO LP. 3. Green (RoHS. & no Sb/Br). CU SN. N / A for . 79L12 Datasheet, 79L12 PDF, 79L12 Data sheet, 79L12 manual, 79L12 pdf, 79L12, datenblatt, Electronics 79L12, alldatasheet, free, datasheet, Datasheets.

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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. So my senior project is due Thursday and because of my extreme wits and knowledge I accidentally connected A Voltage regulator the incorrect way because I was unwary of the different pin-out.

I went to radio shack and they did not have any regulators. Is there any common household objects that have a or equivalent that someone may know datashheet

I understand this is a long shot but I really need this part my project will not work without it. This question appears to be off-topic. The users who voted to close gave this specific reason: Instead, describe your situation and the specific problem you’re trying to solve. The thing dataheet both the and is that the pin out is different as you are aware but there is a strong possibility that the 79l21 connected incorrectly is not actually damaged.

Pin 1 for the is the most positive pin i. Pin 2 is the most negative for the i. So, given the above, there is a strong case for assuming the regulator is undamaged and therefore reusable. If your negative regulator is blown and you need a quick fix, replace the whole thing with a off the shelf 12 V power supply. The power supply output will be isolated, so can float arbitrarily. Connect the positive of the two leads to your ground, and the negative will be your V supply.


Something like this should suffice for a quick setup. D1 is a 13V 1W Zener and could be made up from some combination of zeners in series. R1 is a 2W power resistor and could be made from combining other values. That’s a negative regulator. You could build something similar if you don’t need high performance.

Connect collector to negative input supply. Connect emitter to the V output. You didn’t post your circuit. What I mean by split the power supply at the transformer secondary is to actually split the center tap carefully to make 12, 0 and another 12, 0. Now bridge rectify these two secondaries individually and then use two to create regulated and isolated two 12V supplies. Now connect them in series and take the center tap as your common ground.

Home Questions Tags Users Unanswered. I am Basically building the power supply scene here kerrywong. If it’s only for a reference voltage with a very small current, maybe the shop has a 79L24 absolute max. The 79L series are mA regulators in TO packages. Possibly also available 7l912 a “variety bag”.

Andy aka k 10 When The Regulator is in the circuit it just passes the original voltage right though so on the output pin i get around 36 volts. Well there’s your basic problem – the absolute maximum input voltage you can put on a is 35 volts – if you have 36 volts on the output then datazheet likely have even more on the input side.


Read the data sheet.

79L12 TO-92 voltage regulator -12V 0.1A

The diode droppers in your circuit, at low currents will not drop the supply voltage below 35 volts. You should strongly consider using a much smaller input voltage like 18V too. I also posted the link to the website in my first comment.

So you are telling me that the regulator is just passing the voltage though because it is over volted?

I cannot be sure but over-driving at maybe 37 or 38 779l12 is a good reason you destroyed it. If this is just for a short demo, then you may be able to use a few batteries.

79L12 Datasheet, PDF – Alldatasheet

Olin Lathrop k 30 I Just feel guilty doing that for all they judges know who I am presenting to I could just Put a in there and say look it works and stuck a bunch of wires in there and they would be beyond impressed: Spehro Pefhany k 4 I have a few 2n transistors laying around would that work?

So my local radioshack has a ina they sell it in a pack of two could I use these 2 in series and therically have double the current capacity? And for a quick fix just so it works tomorrow datasbeet might work correct?

At uA load, you won’t need a heatsink. Your transformer must be center tapped 24V type, commonly denoted as 12,0, Your problem solved without need to have the Series diodes drops 0.