I suffered with 10pcs of? bad 78t05 from ali seller and demanded refund and got it.
I am using the Nextion 5"display. When building my Ubitx V5 I used a small step down converter to generate the 5V for the Nextion display. It all worked 100%
Now the building is almost finished i want to replace the 5V stepdown converter. ( It is giving a little amountt of noise¡)
I ordered ( Aliex..) 5 pcs of KA78T05 TO-220 stabilisors. ( is the 3A version-? )
Then I replaced the 7805 mounted on the Arduine and replaced it for the KA78T05 version¡. No working Arduino and no working display.
I find input=12V output=0V. ? Checked before and after the pinning? 1=input / 2 = earth/ 3 =output ? Find a datasheet on Internet and can not find what I am doiing wrong.
After that make a test print only for the KA78T05 and I can not get the 5V output. Output also on a 2nd KA78T05 is still 0Volt. ? Frustrating.? ( I used a 7809 on the same test and output was 9.00 Volt!)
What I am doiing wrong...¡¡.? ? ? ( ordered today local few 78S05 ? ( = 1.5A version? )
So who knows what I am doiing wrong...? ? ? ? ? ? ? ? ? ? ? ? Tnx.? Herman
