Hola Humberto,
Podrias dejarme tener el plano electrico de este protector. Es que necesito proteger los equipos de mis padres y ya no lo venden en ningun lado. entonces lo construire.
Si tienes el esquema , enviamelo si se puede por favor.
Yo tambien me gradue de Tele en la Cujae.
Gracias.
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Hello Humberto,
Could you let me have the electrical plan of this protector. It's that I need to protect my parents' equipment and they don't sell it anywhere anymore. then I'll build it.
If you have the schematic, please send it to me.
I also graduated from Tele at Cujae.
Thank you.

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Thank you for your feedback. There is no need to hurry for sending me the info I asked. Perhaps you will fall again in a similar repair very soon…Anyway keep this in mind and send me this info whenever possible. I need it just because I like op amps very much. Analog control attracts me! Thank you in advance!

Best Regards

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Hi Paris, first of all I´ve seen this kind of situation as you say: painted terminals. But I´ve seen too another method of isolation: the terminals are cover by a spaghetti, as we usually call in my country.
This device is transformeless (capacitive). It has one or two (do not remember exactly now) ICs. It´s a pitty I do not have this device with me now, the owner is using it, but I´ll look for a similar to take some pictures and send them to you by means of Jestine Yong.

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Thanks Parasuraman, a new experience for me with this repair.

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Thnaks Robert, I could not find the culprit, me was finding a bad component all the time in the circuitry, as usaul, and finally the culprit was two leads together. A new experience for me and for the readers too.

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Yes Mark, we comment all our experiences in this blog and every one of us learns day after day.

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Thanks Jogesh

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You are right Albert, this devices protect our electronics and appliances and therefore they are necessary. Thanks.

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Good job! Now, a few words about the shorted resistors and the effect they caused. First of all, the main problem is of course a design quality issue. Wherever (through hole) resistors are intended to be used in vertically mounted position on the PCB, if quality obeys high standards they should always have their long exposed terminal fully painted and therefore isolated to their adjacent and similarly exposed ones. Otherwise the space economy attempt through their vertical positioning (on the manufacturer’s part) has a high cost in failures (reflected on the owner’s part) as in your case here. Apart from that, and most likely, the previous technician himself had inadvertently caused this short trying to restore its proper function without taking equally proper care in what he was doing during his attempt.
And some questions…Is this device powered by L.F transformer or is transformerless (capacitive)? Is it using the quad op amp LM324? Can you please answer me these questions? (It would be clearer to me if you had provided us with an additional photo showing the overall component side PCB view)…

Best Regards

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