LMK datasheet, LMK circuit, LMK data sheet: ISC – isc Three Terminal Positive Voltage Regulator,alldatasheet, datasheet, Datasheet search site. LMK 1A Positive Voltage Regulator The TCI LM78xx family is monolithic fixed voltage regulator integrated circuit. They are suitable for applications that. LMK Datasheet PDF Download – Three Terminal Positive Voltage Regulator , LMK data sheet.
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Discussion in ‘ DIY ‘ started by elnaldoJun 24, Log in or Sign up. Why this Voltage regulator is so expensive?? Datasheeh it some very special part? Is it lm78122k to availability? Is the metal TO-3 case too expensive to manufacture? Is the TO-3 version much better than the plastic TO?
Mouser link No Affiliation https: The Valley of Chief Black Hawk. It’s likely that not many are made in T cases.
MA7812 (LM7812K) Voltage Regulator
I’d also be getting the TO and heat sink it as necessary. WatthourLm7812i 24, I’m guessing demand must be near zero. ConradHJun 24, Is my math right?
I don’t think the mixing console it feeds will draw 1. I’d suggest sinking it directly to the chassis with an insulator and lots of thermal paste. You can always stretch the leads to fit the board. Maximize air space around it as well. Bill Ferris and Lavane like this. I redid a Soundcraft Delta power supply that had like 5 of those TO-3 guys in it.
One was an NTE and I wanted to replace it but saw datasjeet prices you did and thought otherwise. You’re probably best off retrofitting with a TO however. Main problem of doing so is that the thermal resistance of the TO-3 is better than TO Remember that heatsink paste only complements the contact – fill the air voids. You want metal-metal contact ideally, not through heatsink paste.
LM7812K – Voltage Regulators
Torque down properly – don’t overtorque and cause the flange to bend or too little, leaving air voids. Of course if you have to deal with insulation, you’re screwed. Other possibilities include adding a series pass transistor or diode drops so that the LMT doesn’t take the brunt of the drop.
The former will require significant redesign however. I’m running a dual regulator right at its max rating to regulate a pair of B tube filaments. Adding a much bigger heat sink mounted to the chassis top plate really helped.
Why this Voltage regulator is so expensive ?? | Audiokarma Home Audio Stereo Discussion Forums
It’s been a year so far and not one time has it shut down from over heating. If your close to the max extra heat sinking should work. You could mount the regulator somewhere else to make km7812k easier to add one if needed as sKiZo suggested. That’s what I did it worked fine.
LavaneJun 24, It’s a Soundcraft CPS power supply, this is the heat-sink, devices are om7812k. I don’t have the plastic covers. I think I’m going the TO route I can get it locally. I’ll check the mixer specs to see if I need a second device in parallel, but I think with 25W it will be fine. I can add some smaller heat-sinks inside the cabinet, using one of the TO-3 screws unused with the TO device. Pict from the internet, not mine: NTE is the replacement and cost datashert.
Funny, I have a new old stock that I purchased in for a power supply project and ended up using a to instead.
LMK_PDF Datasheet Download IC-ON-LINE
The PS is rated 1. I’ll try this one and see how long it lasts. If it blows this next month I’ll modify the circuit to install To devicesperhaps with a resistor in parallel.
Lavane and Pio like this. They’re long gone out of production.
That explains the price. I know its real because its from I’m pushing it hard and although a TO pkg. Check the 78xx regulator application notes for how to use a high power parallel bypass transistor to xatasheet a high current regulator. Careful, bare metal contact is always better than adding anything in between – especially air voids.
The soft silicone insulation at least removes some of the air voids, but still not better than metal-metal contact. If you go the TO route, you l7812k indeed hook up two TO’s in parallel with a low value resistor say vatasheet. You may still need to check whether the circuit will support the extra current from the ADJ pin.
You may be better off drilling new holes for the TOs, using the existing TO-3 holes may not work well. You must log in or sign up to reply here. Share This Page Tweet.
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