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YIHUA-937D Repair
#14
Da sve to stoji ali ja odkad sam zavrsio davno elektrotehničku školu rekao sam sam sebi da trafoe ne diram..znam da nije sad tu neka tabu da se napravi ali nevolim da se petljam sa AC naponom...zahvaljujem na info...

Mislim da nece da bude problema jerima jednu 1N4007 diodu koja sluzi za poluvalni ispravljač (drugu nevidim na PCB-u) koja ide na LM7805 i okolo ima 10uF/16V i 10nF keramicke kondove koji napajaju MCU i LED display...a onaj 24VAC ide direktno na trijak B137 i optiocoupler koji je upravljan preko MCU...mislim da nebi trebalod a bude problema jer i ovaj kineski poštop ima izvode 24VAC i 10VAC dodje ti isto kao i 12VAC+12VAC samo što ce da bude veca disipacija na LM7805 jer sa dosadasnjih 10VAC (14,4VDC) ce skociti na 12VAC (cca 17VDC) sto je oko 2,6VDC visi napon...ali netrose toliko LED displayi i MCU i optocouipler da nebi malisan od LM7805 mogao to da izdrzi...
SAMO-BANOVAN OD 01.11.2024
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Messages In This Thread
YIHUA-937D Repair - by ronovar - 03-24-2018, 10:43 AM
RE: YIHUA-937D Repair - by deksi - 03-24-2018, 10:55 AM
RE: YIHUA-937D Repair - by Milan94 - 03-24-2018, 10:58 AM
RE: YIHUA-937D Repair - by ronovar - 03-24-2018, 11:17 AM
RE: YIHUA-937D Repair - by Dragan83 - 03-24-2018, 11:27 AM
RE: YIHUA-937D Repair - by ronovar - 03-24-2018, 11:43 AM
RE: YIHUA-937D Repair - by Milan94 - 03-24-2018, 11:52 AM
RE: YIHUA-937D Repair - by Milan94 - 03-24-2018, 11:33 AM
RE: YIHUA-937D Repair - by TDA - 03-24-2018, 12:02 PM
RE: YIHUA-937D Repair - by Dragan83 - 03-24-2018, 12:06 PM
RE: YIHUA-937D Repair - by ronovar - 03-24-2018, 12:09 PM
RE: YIHUA-937D Repair - by ronovar - 03-24-2018, 12:42 PM
RE: YIHUA-937D Repair - by Khadgar2007 - 03-24-2018, 12:56 PM
RE: YIHUA-937D Repair - by ronovar - 03-24-2018, 01:02 PM
RE: YIHUA-937D Repair - by ronovar - 03-25-2018, 12:21 PM
RE: YIHUA-937D Repair - by nik - 03-25-2018, 12:59 PM
RE: YIHUA-937D Repair - by ronovar - 03-25-2018, 01:06 PM
RE: YIHUA-937D Repair - by nik - 03-25-2018, 01:20 PM
RE: YIHUA-937D Repair - by ronovar - 03-25-2018, 02:50 PM
RE: YIHUA-937D Repair - by euronymous - 03-25-2018, 03:09 PM
RE: YIHUA-937D Repair - by ronovar - 03-25-2018, 04:42 PM
RE: YIHUA-937D Repair - by ronovar - 03-26-2018, 06:41 PM
RE: YIHUA-937D Repair - by Dragan83 - 03-26-2018, 07:40 PM
RE: YIHUA-937D Repair - by ronovar - 03-26-2018, 07:52 PM
RE: YIHUA-937D Repair - by euronymous - 03-26-2018, 08:43 PM
RE: YIHUA-937D Repair - by euronymous - 03-26-2018, 08:44 PM
RE: YIHUA-937D Repair - by ronovar - 03-27-2018, 10:00 AM
RE: YIHUA-937D Repair - by euronymous - 03-27-2018, 11:14 AM
RE: YIHUA-937D Repair - by ronovar - 03-27-2018, 02:09 PM

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