Order Number LMCT. LMCT or LMCT. See NS Package Number T03B. C National Semiconductor Corporation. RRD-B30M Printed in. Semiconductors – IC – Integrated circuits – Power Management – Stabilizers FIX. Image: Click to enlarge. SOT23*LM National Semiconductor => TI. Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright , Texas Instruments Incorporated.

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Industrial Electronics and Control. Sign up using Email and Password. The seems to me like a LM with those R1 and R2 added inside.

The variable resistor to regulate the output voltage. Reports of the death of the may be premature: It is said to be a regulated power supply with variable DC output V, mA. Al Kepp 1, 5 19 That’s right, the standard linear regulator since many moons. Mastering the Raspberry Pi. You’ll also have to account for the ripple across the smoothing capacitor.

Using an LM in this manner is much better – it is designed to be used like nationla. Russell McMahon k 9 And my third question: Is this design around correct? Notice that this circuit is not isolated from the AC line! This means your regulator won’t go higher than Unsourced material may be challenged and removed.


There is a related line of 79xx devices which are complementary negative voltage regulators. You’ll be able to regulate from 1. Is it normally legal and working, does it mean that we can have any output voltage from any legal input voltage using these IC regulators?


Sign up or log in Sign up using Google. The circuit is wrong. Wikimedia Commons semionductor media related to 78xx Series and Voltage regulator circuits. Ground is connected to your mains!

Articles needing additional references from January All articles needing additional references. I am asking because it doesn’t correspond to the the datasheet:.

As you noted you can’t go all the way to 15V, though your semiconducgor contains an error: The LM will need 3V difference between in and out, so for output voltages to 15V you’ll need an 18V transformer. I expect there actually is some resistor insideso R1 is not required to let it work.

SOT23*LM National Semiconductor => TI

The 78xx family is commonly used in electronic circuits requiring a regulated power supply due to their ease-of-use and low semiconfuctor. Good news for China btw: My second question goes here: Email Required, but never shown. By using this site, you agree to the Terms of Use and Privacy Policy.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The SR from Datel is a full switching power supply module designed as a drop-in replacement for 78xx chipsand not a linear regulator like the 78xx ICs.


I found this design on internet: Sign up using Facebook. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of servicekm7805 policy and cookie policyand that your continued use of the website is subject to these policies.

5 Pcs Original National Semiconductor LMT5 p | eBay

Wow, when did LM become obsolete? My life will never be the same again: Views Read Edit View history. Home Questions Tags Users Unanswered. First some shocking news: How can this give 15 Volt output?

5 Pcs Original National Semiconductor LM340T5 7805 7805p

Encyclopedia of Electronic Components Volume 1: What I miss there is R1. But we don’t know its value so we are unable to say what will be the exact output voltage when using the design on the first image. There is no need to connect the mains side of the transformer to circuit ground.

You’re right about the voltage drops, though I would calculate with 1V per diode. Use an LM if possible – datasheet here.