Be prepared to read lots and lots and lots of books and watch lots and lots and lots of videos and make your own circuits and attempt repairs on broken electronics. it will be at least one year before you are decent at troubleshooting. Electronics repair is not for someone who cannot remain dedicated to learning.
At 3:08, the comment referred to a measure between ground and output. That confused me until I realized that was a no continuity reading between input and output.
Check the Pinout: The 79xx series typically has three pins: Pin 1: Ground (GND) Pin 2: Input voltage (Vin) Pin 3: Output voltage (Vout) Use a DC power supply, set to a voltage higher than the negative output voltage of the 79xx regulator. For example, for a 7912 (−12V regulator), the input voltage should be more negative than −12V, like −15V. Connect the Regulator: Pin 1 (GND) to the ground of the power supply. Pin 2 (Vin) to the negative voltage from the power supply (e.g., −15V). Pin 3 (Vout) will give the regulated negative voltage (e.g., −12V for a 7912). Measure the Output: Use a multimeter to measure the output between Pin 3 and Pin 1 (ground). The output should be stable and equal to the rated value (e.g., −12V for a 7912, −5V for a 7905). Load Testing: To check performance under load, connect a load resistor across the output (Pin 3 and Pin 1). The output voltage should remain stable at the rated value. Good luck
How to fix L7812 ic load time functionality inactivity while device connected on running mode ? Query1: ===== I used 12v*2 3000mA with 2 diodes 5408 and 2200uf/35v . Which other capacitor value need to use in the output section of L7812 ic ? Query2: ======= My 12v*2 3000mA transformer where i connected 2200uf and 2 diodes 5408 and out shows 16.68 v. Then i added L7812 and voltage shows 12v with heatsink . But while i charged a lead acid battery then ic gone over heat and this continuty i cheaked got result 16.68v . Then i stoped the charging and refresh . Again on the switch and voltage shows 12v . That neans heating the ic automatically ic is gone inactive . In this time if i used any device by this power supply due to over vault connected device will be damaged automatically. How can i keep my circuit safe while the output turn 16.68v to 12v while L7812 is inactive due to overheat ?
You are saying we shouldn't get any continuity between ground and input, and we should get continuity between ground and output? How about between input and output?
it took me searching through so many videos to find one that explains things perfectly thank you!
I'm so glad! thank you
You are a very good teacher, thank you sir..
So nice of you
Another excellent video
Thanks again!
it is nice explanation thank you
You are welcome
Can I use an LM7805 in place of a L7805CV? I couldn't find what the CV stood for.
Thanks.Very interesting.
Glad you enjoyed it
Thank You.
thank you very much sir for sharing...god bless.
Always welcome
Any test for 3-TERMINAL NEGATIVE VOLTAGE REGULATOR NJM7900 1. COMMON 2. IN 3. OUT
Can you test the voltage regulator in circuit ? Thanks!
Thanks for the video. Really helpful for out of circuit ICs.
Glad you liked it
tnks master! i found you
I need to know about electronics
Be prepared to read lots and lots and lots of books and watch lots and lots and lots of videos and make your own circuits and attempt repairs on broken electronics. it will be at least one year before you are decent at troubleshooting.
Electronics repair is not for someone who cannot remain dedicated to learning.
Exactly like that and more at times…
At 3:08, the comment referred to a measure between ground and output. That confused me until I realized that was a no continuity reading between input and output.
So nice
How do you test 79xx
Check the Pinout: The 79xx series typically has three pins:
Pin 1: Ground (GND)
Pin 2: Input voltage (Vin)
Pin 3: Output voltage (Vout)
Use a DC power supply, set to a voltage higher than the negative output voltage of the 79xx regulator. For example, for a 7912 (−12V regulator), the input voltage should be more negative than −12V, like −15V.
Connect the Regulator:
Pin 1 (GND) to the ground of the power supply.
Pin 2 (Vin) to the negative voltage from the power supply (e.g., −15V).
Pin 3 (Vout) will give the regulated negative voltage (e.g., −12V for a 7912).
Measure the Output:
Use a multimeter to measure the output between Pin 3 and Pin 1 (ground).
The output should be stable and equal to the rated value (e.g., −12V for a 7912, −5V for a 7905).
Load Testing:
To check performance under load, connect a load resistor across the output (Pin 3 and Pin 1). The output voltage should remain stable at the rated value.
Good luck
@@electronicsrepairbasics_erb thanks 🙏
Nice video
Thanks
Hi master
I want from you put all short component and show if this beep or no beep then is short
This will fast testing for finding shorts
I have a voltage regulator it very very so hot and the device wldnt turn on. What is the problem
Witch kind of voltage regulator, is it SMD voltage regulator or THT VR.
Waiting for your reply,
This test is also valid go all smd regulator ?
yes to 80%
How to fix L7812 ic load time functionality inactivity while device connected on running mode ?
Query1:
=====
I used 12v*2 3000mA with 2 diodes 5408 and 2200uf/35v . Which other capacitor value need to use in the output section of L7812 ic ?
Query2:
=======
My 12v*2 3000mA transformer where i connected 2200uf and 2 diodes 5408 and out shows 16.68 v.
Then i added L7812 and voltage shows 12v with heatsink .
But while i charged a lead acid battery then ic gone over heat and this continuty i cheaked got result 16.68v .
Then i stoped the charging and refresh .
Again on the switch and voltage shows 12v .
That neans heating the ic automatically ic is gone inactive .
In this time if i used any device by this power supply due to over vault connected device will be damaged automatically.
How can i keep my circuit safe while the output turn 16.68v to 12v while L7812 is inactive due to overheat ?
Tha is pnp or npn?
It is not a transistor but linear power regulator.
My L7805CV is giving me 2.4Volts
You are saying we shouldn't get any continuity between ground and input, and we should get continuity between ground and output? How about between input and output?