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Old 13th December 2007, 05:27 PM   #1
tadiam is offline tadiam  Argentina
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Default speaker protect schema here

I build this the last week and work well.....this detect +/- tension.
I use one circuit for each channel and idividual relay...
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Old 13th December 2007, 09:09 PM   #2
Donk is offline Donk  Europe
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The circuit was published by the Elektor magazine. Should work fine.
Anyway I'd add an AC loss detector.
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Old 14th December 2007, 06:16 AM   #3
Nordic is offline Nordic  South Africa
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No offence, but the upc1237 chips are less than a dollar,
will detect AC loss, as well as DC offset... All it needs is about 5 resistors 3 small electrolytics, 2 diodes, and a small film or ceramic cap. can be used with as many channels as you like as long as they are powered by the same PSU... as it samples AC before the rectifier and DC after it...

Better yet, it needs no dedicated power supply like your 12V rail, it powers itself through the senseing wires... can be used on amps from 25 to 60VDC.
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Old 14th December 2007, 08:11 AM   #4
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Default As you know i am in South America... despite we are not too much delayed


I have to explain you dear Nordic, to inform you the differences we have, related development, compared to other more modern countries, we use shops to buy those things....of course... i am talking about Brasil...and i could perceive those things are changing and fast.

And even the bigger ones, the big shops, have not complete line of chips.

The transistorized option, even beeing worst, is an option to us that have not the easy way to buy those things.

We cannot order by mail.... in my place customs block those things saying it is an imported good subjected to taxation... sometimes they block and ask your presence into the Mail department..sometimes your parts just disappear without left track.

So...we do not use internet to order things, in such a confortable way., sitted in front our computer.. we move our.... our..... our bodies to downtown... we spend gasoline (4 bucks!), we pay parking place (one more buck!), we walk as a hell, we go to the streets were the electronic shops are... we enter strips...we ask for the unit and the salesman answer you.

- "UPC we have 1221 and 1225...but we do not have the one you ask...i will take note of that and soon (6 monthes of new importation period of time...and if the shop owner perceive many folks asking for the same part number) we will have that part for you."

To assemble with transistors we can do those things easier... i am also searching for a complete schematic..but i want off set sensor.. also o would like to adjust the time delay to enter the speaker... would like to have monitoring leds to show me the circuit operation and so on.

I do not know, exactly, what happens in Argentina...but as we are neighboors...it is possible that happens the same way.

regards,

Carlos
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Old 14th December 2007, 10:49 AM   #5
tadiam is offline tadiam  Argentina
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Ok in argentina happen the same...have good parts at hight prices and normal (fakes) at normal prices.
The stores sales the normal components...have specials parts but your need import this and yours prices are higth (in most cases the salesman no know the conponent)

I need make amps or circuits at normal and easy find parts no rare....maybe the upc are best but here make "for necessity" easy find parts components and circuits...

Carlos..build the dx..work well at my ls70 speakers....but the search continue......
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Old 14th December 2007, 10:55 AM   #6
tadiam is offline tadiam  Argentina
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Default re2

too heve 2-3 second delay.
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Old 14th December 2007, 11:55 AM   #7
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Default I am happy you have build it Tadiam


Yes... the search continue.... for whole life!... this is the fun!

regards,

Carlos
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Old 14th December 2007, 04:54 PM   #8
Nordic is offline Nordic  South Africa
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I have 2 of the chips left if you want em...
They are very small, with 8 pins in line...
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Old 14th December 2007, 05:58 PM   #9
teemuk is offline teemuk  Finland
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As much as I agree with Nordic about the superiority of chip-based solutions it’s always nice to see examples of how discrete circuits accomplishing the same things are put together. After all, if no one would pass on this know-how there eventually wouldn’t be people left to design the chips in the first place.

Could someone perhaps present some simple ideas of how this circuit could be modified to house features such as a fault indicator LED and the aforementioned AC loss detector?

And I can totally relate to Carlos and Tadiam: Around where I live all these ICs that have some kind of a special function are rarities in local component shops and if you have to order them they become quite an expensive solution. ...Assuming the ordering is even an option. I was under the impression that they discontinued manufacturing of uPC1237 anyway?
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Old 14th December 2007, 06:55 PM   #10
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Default Into the present moment, it is not my priority to study this subject, but


near future i will search for or develop a discrete protection with all features.... i think i am able to do that... at least i can try.

Fully agreement Temuk..... hard to find parts..... well..... i do not love too much those chips....black boxes.... we do not know what is inside...i felt discrete more kind, more interesting, more romantic...well.... i prefer discrete...maybe because i am an old folk.... from the transistor era..... i was able to have the first transistorized radio.... was very interesting those days.

People say the transistor was not human discovery... that was found into an Unindentified Flying Object (UFO) , an outside earth aircraft that fell down in Roswell, down the fifties.... i do not know exactly, but make a lot of sense...also laser and some material bullet resistant too..metals with memory of shape... those things.

Of course we are not alone in this enormous Universe...no chance to be alone!

regards,

Carlos

.................................................. .................................................. ...

Of course i want dear Nordic

But also i do not want you to spend more money sending me things... you have already made a lot of those things to me.... you have sent me some heatschrink material and Field Effect Transistors..... mail to Brasil is not cheap....because of that, with my thanks because your kindness, i decline your kind offer.

regards,

Carlos
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