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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You’ll also have to account for the ripple across the smoothing capacitor. Industrial Electronics and Control. The transformer’s output on the above picture is 12V, then 2 diodes take 0.

78xx – Wikipedia

My life will never be the same again: It is said to be a regulated power supply with variable DC output V, mA. To protect against the back polarity problem that you mentioned, connect a diode from output to input usually non conducting. There is a related line of 79xx devices which are complementary negative voltage regulators. Email Nqtional, but never shown.


The seems to me like a LM with those R1 and R2 added inside. This means your regulator won’t go higher than OlinLathrop don’t forget s and s There are some problems with the design.

5 Pcs Original National Semiconductor LMT5 p | eBay

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Natilnal as a guest Name. That’s right, the standard linear regulator since many moons.

Wow, when did LM become obsolete? I am asking because it doesn’t correspond to the the datasheet: In the datasheet for the LM the LM is recommended as a variable output alternative.

In other projects Wikimedia Commons. The 1N for the rectifier is overkill. What I miss there is R1.


semicondductor Wikimedia Commons has media related to 78xx Series and Voltage regulator circuits. It can withstand a reverse voltage of V, while the 50V of the 1N will do nicely. Reports of the death of the may be premature: By using this site, you agree to the Terms of Use and Privacy Policy.


How can this give 15 Volt output? For the years, see 8th millennium. Ground is connected to your mains! Some devices provide slightly different voltages than usual, such as the LM78L62 6. Is this design around correct? semicondutor

First some shocking news: You’re right about the voltage drops, though I would calculate with 1V per diode. This is the first I’ve seen of consolidation between TI and National part numbers, but you knew lm805 had to come sooner or later.

5 Pcs Original National Semiconductor LM340T5 7805 7805p

There is no need to connect the mains side of the transformer to circuit ground. 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?

From Wikipedia, the free encyclopedia. Mastering the Raspberry Pi.