https://jestineyong.com/peculiar-case-of-secondary-wire-found-open-in-2-1-multimedia-speaker-system-model-deltron/ Semiconductors, Test Equipments, Circuit Board Troubleshooting, Electronic Repair Courses and Many More! Sat, 16 May 2026 10:56:17 +0000 hourly 1 https://wordpress.org/?v=5.4.19 https://jestineyong.com/peculiar-case-of-secondary-wire-found-open-in-2-1-multimedia-speaker-system-model-deltron/comment-page-1/#comment-457800 Sat, 16 May 2026 10:56:17 +0000 https://jestineyong.com/?p=37317#comment-457800 Glad that you were able to fix this speaker system with partly defect transformer by adding a second 9V AC transformer to feed the 7805 regulator to be able to create the previously missing 5V DC. Instead of adding a new transformer another option would be to add a small 5V 3A module that can easily be fed by inputting 230VAC. This affordable ones: https://www.youtube.com/watch?v=ihUAA20oxik
They are not expensive, and light weight and about the same size as a small transformer so would make an easy fit.
I bought a couple of these to make safe replacement power supplies for the well known famous Commodore C64/128 computers. The power adapters I made with them require both a 9VAC transformer (9VAC/1A) and a 5V DC voltage (at least about 2,5A DC) but the modules are 3A max.
And good to know is that the 5V/3A modules that are sold on Aliexpress are a bit bigger why those on Amazon are to be prefered!

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]]> https://jestineyong.com/peculiar-case-of-secondary-wire-found-open-in-2-1-multimedia-speaker-system-model-deltron/comment-page-1/#comment-457798 Sat, 16 May 2026 10:20:38 +0000 https://jestineyong.com/?p=37317#comment-457798 Good Job!Sir
Still i found linear power supply supply are more reliable then SMPS.
SMPS Circuits having more protections still failure rate is high.

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