Why is doesn't work

Note: The text is auto translated from the Greek version

 

You have, after long times and labor, assembles the manufacture that so much you waited for. Him you supply and, while you wait for run the electrons in in the circuit, you remain with the soldering iron in the hand to wonder and to wonder: ma because it does not work. First you begin to accuse villain your star or misfortune that you hits you when you go to touch a manufacture, you read the directives that follow. We believe that from you they will remove sure from the labyrinth of your queries and, mainest, will make your manufacture work with first.

I more from us, when we find the manufacture of our dreams, we badly go, - the lies -, at straight line to the list of materials, passing all the directives of manufacture. Cause for this, from that we have concluded has been the excessive confidence in our knowledge. Because, however, no one is not perfect and all, sometimes, we can make mistakes, small big, our own humble advice is to examine with attention your each previous movement front you execute next. In electronic, a small error it can cost simply your time (you remember that the time it is money)  or some burned element. A big, however, error, can destroy the manufacture but also create bigger problems, special if it is supplied by the network.

En any case, good is we anticipate the error, front it develops, with unanticipated for the circuit, but also for us, consequences. The directives of manufacture and use of appliance exist for one and unique aim: in order to they are read. Differently they would exist. Of course it should we forget also their educational character. Through them, can the beginner, but also experienced, learn various things that up to that moment ignored. Prefer, therefore make a careful reading, despite a… premature repair.

 

Attention in order to not. .. recheck.

You stuck all the elements, you believe that you have finished? Do not be in a hurry. Have work still. Turn in reverse  pcb and check all him you stick to. If somebody to you she appears cold, warm it again with the soldering iron. The cold solder doesn't glow, is bedazzle and creates a small clod round pin the element causing problems in the circuit. Check carefully the place and the time of each element, comparing him with the topographic diagram, the table of materials and the theoretical circuit.
Be sought some element that probably has been placed in error Place. In case where the erroneous element is sensitive, as diac, triac, desolder with attention and, before reset in his right place, good it is him you check - an this is possible. If it exists also the least doubt for his integrity, you do not hesitate him to replace with other new. Because, apart from the abnormality that will create in the circuit his reset, exists and the probability it destroys also many but elements.

 

The  right power supply is. .. everything

Because all the appliances are not same exists always somebody power supply that suits in every from them. They simply exist power supply, stabilised, with protection, but also next, symmetrical, with specifically anti-RF circuits that each one of them it accompanies also from a different type of circuit. Best, naturally, would be to prefer power supply that have been drawn specifically for the manufactures that you have chosen to assemble. Experiment consequently with doubtful quality power supply, specifically if you do not have elements for them.
The circuit of your manufacture has been drawn it works with the tendency that is reported in the drawings. His different tendency from proposed, except that you it will give the results that you wait for, exists case it destroys some element or, at worst, and entire the circuit. The same problems it can cause also reverse polarity of catering.

 

Not begrime the pcb

The solder, that circulates the last years in the market, contains all the essential components for the right welding, so that it does not soil your nose soldering iron. Consequently, you insist to use even today solterine, it is at least unnecessary, if no detrimental, for pcb your. If you use excessive quantity solterine, it is likely, her residues above in printing they specifically create problems in the operation of circuit, if, the circuit works in high frequencies.
For these reasons it is essential, front you place in operation the circuit, you clean meticulously pcb with spray cleaning (p. x. Electrolube PCB cleaner) the isopropyl alcohol, acetone, or other similar resolvent. The cleaning pcb except the other, you will help you locate more easily by any chance short-circuits elements that have not been stuck.

 

Attention in sort circuits

At the welding, it is likely short-circuit two near lines of the printed circuit between them, or pins completing, the transistors and generally all the modern microscopic materials. Check, consequently, carefully all him you stick above in pins, as also and the lines of printed circuit that approach a lot between them In order to you can make the control more easily, you lit up pcb from under and observe carefully all the lines. Thus you might discover some accidental short-circuit or even cut somebody from them. If you realized short-circuit, you clean carefully the neighboring points. If you realized however somebody cut, you link the two points with a small small piece cable. The circuit, apart from the elements that are found above in pcb, contains also elements that are connected outside by this, as for example a lamp, potentiometer etc These will be supposed they are connected without errors, after also these parts of circuit. Be certified that you have made all the connections rightly. If no, you are consulted the diagram of exterior connections that accompanies the directives of manufacture. There you will find all the directives on the connections of catering and the remainder exterior elements of circuit.
The diagrams are so much analytic, that only from carelessness the excessive certainty you can make error. Check an the connections of all exterior materials have become as should in the corresponding metal spikes (pins). Use the exterior elements that are reported in the list of materials, and no similarly, in order to you have the expected results. In opposite case, it is likely you cause irreparable damage in the circuit.

 

Not. . chase the circuit.

The circuit of each manufacture, has been tried exhaustively so that are satisfied in full all the technical specifications that are reported in the table of technical characteristics. Consequently, each attempt of his improvement except that it involves changes in the behavior of circuit, includes also his danger of destruction,  if this becomes from not special. Without we want to underestimate your faculties, you we recommend you do not intervene in the circuit, if you are not sure that what you make will lead to positive results. Attention therefore in the interventions…

Copyright Magazine: ELECTRONIC KIT AND MANUFACTURES COPY 2

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