Good Morning Jose,
Please send your mailing address to me at kb9yig@... and I will mail a letter to you with a 74AC74 contained within at no cost to you.
Regards,
Tony, kb9yig
toggle quoted message
Show quoted text
On Oct 18, 2021, at 6:46 AM, EA4B <ea4bmg@...> wrote:
Good Morning Group,
Finally I have been able to verify that the DIVIDER U5, IC 74AC74 gets hot when I connect the power.
Yesterday, I removed the integrated circuit IC U5 (74AC74) and the voltage returned to normal.
I have verified that the 7805's output voltage is the expected 5v as well as the RX OpAmps and TX OpAmps stage IC voltages are correct.
I checked IC5 again, soldered PIN 7 (ground) and PIN 14 (+ 5V) and again all voltage dropped as before.
The bottom line is that U5 (74AC74) is the cause of all the problems.
Thank you very much for your help.
73
Jose Maria, EA4B
P.D. Now I have a new problem because the 74AC74 costs only � 0.50 but the shipping cost is � 20 !!!
