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Yet one more ATU-10 PCB

#ATU-10

Sardar (AC8L) All Messages By This Member #3473 Hi, ? I have designed a yet one David's (N7DDC's) ATU-10 PCB based on Glenn's (VK3PE's) schematic (v1.32). It fits 100x88mm enclosure. I want to release it for as an open source for JLCPCB ordering (SMD assembled) as is and later use the design for an internal ATU for QMX+. See my ABS solution here: (). ? Since JLCPCB have PIC16F1454 SMD completely out of stock and only handful of PIC16F18877 - I used through hole versions of both to be installed in sockets. Before placing a test order of 5 (costs 134$ plus shipment from China to VA) I want to clarify some confusions I had while reviewing the original design. I hope Glenn and Dave will be able to review my KiCAD schematic (attached). ? These are my confusions: 1. Should COMM_C indeed go pins 7&2 of relays, not 4&5 pins? 2. Should each L indeed be connected to pins 5&4, not 7&2? 3. There is only one pair of electrolytic tantalum caps C78 and C79 connected to S1 source of driving FET's SW8 and SW9. Is the PCB size the only concern why they are not placed to every source of driving FET's. And, does just than one pair make a difference? 4. Should not relays have heavy caps on COMMON side also (like C78 and C79) since voltage has to be reversed to switch the relay?? 5. Glenn's schematic does not mention pins CC1 and CC2 of USB connector. Should not they be connected to ground through 5k1 resistors to communicate the cable plug event to the charger? ? -- 73, Sardar (AC8L, 4K6SA, VA3DUA). ATU-10_AC8L_Schematics.pdf ATU-10_AC8L_Schematics.pdf
David Fainitski All Messages By This Member #3474 hello, Sardar 1) common C goes to 3-6 pins of relay K1, Common L to 4-5,? correct 2) 4-5,?correct 3) 2 power buses have 2 caps 4) I cant understand, no reversing power supply voltage there 5) yes, use 5k1 for both those pins.
Glenn All Messages By This Member #3475 开云体育 Nice work Sadar, I haven't looked closer at your questions as yet but can tell you the 5k1 resistors are on my V1.32c PCB. Glenn vk3pe
Sardar (AC8L) All Messages By This Member #3476 Glenn, ? Thank you! It looks like the only difference between 1.32 and 1.32c are those R24 and R25 resistors, right? I will be updating my schematic accordingly. ? When you got time could you look for the rest of my schematic to make sure I did not make unrepairable PCB errors :) ? -- 73, Sardar (AC8L, 4K6SA, VA3DUA).
Glenn All Messages By This Member #3477 开云体育 No problem, Sardar, glad to help It might be some time though before I can check your schematics.? We have had a death in the family and not convenient at moment . Glenn On 28/01/2025 2:41 pm, Sardar (AC8L) wrote: toggle quoted message Show quoted text Glenn, ? Thank you! It looks like the only difference between 1.32 and 1.32c are those R24 and R25 resistors, right? I will be updating my schematic accordingly. ? When you got time could you look for the rest of my schematic to make sure I did not make unrepairable PCB errors :) ? -- 73, Sardar (AC8L, 4K6SA, VA3DUA).

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