Problems with J5 build...

    Hi, I wondered if anyone could advise on what I might have done wrong with my J5 build?

    After wiring everything up and plugging it in, C16 started to make clicking noises and then actually popped/exploded! I'm going to get a replacement capacitor but, in the meantime, would like to figure out what I've done wrong.

    I've double checked the wiring against the layout plan and the pictures in the manual and it seems to be fine. The polarity of C16 was as it should have been. The only thing I can think of was that I maybe wired up BR1 wrongly? The + and - legs of BR1 are wired up as they should be. MY question is whether it makes any difference which of the "~" legs is wired to tap 8 or 9 of the PT and, if so, how exactly that should be wired up?

    Any other suggestions as to what I might have done most welcome too!

    Thanks in advance.

    Phil

    Re:Problems with J5 build...

    The problem was as I suspected - BR1 wrongly wired up.

    It's now wired up correctly and a new capacitor is in place. The voltages seem to be correct across most of the board but I have no sound yet - a bit of tweaking to be done, but at least I've had no more explosions!

    ;)

    Re:Problems with J5 build...

    Check your soldering - it's the most common cause of electrical problems (second is probably that you have followed the layout correctly - electronic component failures are rare but not unheard of and may be exacerbated by how well you solder!).

    • Have you tinned all your conductors before you join them?
      Simply heat one conductor for a short amount of time whilst applying solder to the conductor (not the iron - a very small amount of solder may need to be applied to the tip of the iron then removed to ensure it is clean (by the action of the flux core) and is not going to contaminate your joint) the tinning should be shiny silver, allow you to still discerne the shape of the conductor and should not be "blobby". Dirty conductors may require cleaning (some form of solvent) before being tinned!
    • Do you have any dry joints?
      Your solder joints should look bright (unless using lead free solders - another whole topic I won't go into) and the outline of the two conducters you have joined should be clearly visible (though I acknowledge this is trickier to achieve on these eyelet boards).
    • If your joints are not coming out shiny ensure that your soldering iron is man enough for the job as some cheaper irons aren't worth the money you spend on them as they either can't achieve the required temperature or they simply don't pump enough power into the thing. REMEMBER though to much heat for too long can potentially damage or reduce the life of your components!
    • To solder a joint hold your two conductors against each other touch your iron to both and apply the solder to one or both of the conductors until it flows freely (not very long perhaps a second) then keep the conductor in place until the joint cools it should look shiny and the outline of both coth conductors should be discernable.
    • If your unsure how much heat your component can take or you are soldering an IC package (Bridge rectifier (amp PSU), diode (amp switching circuit), chips) it may be useful to put a heatsink between the solder joint and the package (pinch a set of pliers on the conductor above the joint or you can buy a heatsink for about £4)


    Hope some of that is useful to someone. :)

    Madamp - Amp Mad more like!

    Re:Problems with J5 build...

    Thanks, that's a useful checklist.

    I've had a look over things again and still can't get any sound out of it whatsoever.

    The voltages all seem to be what they should throughout the circuit. There seems to be a problem around the output - I can measure a voltage at the primary taps, but nothing at the secondary taps at all.

    One thing I'm not sure about still is the wiring for the input and output jacks - I think I may have done this wrong. Does anyone have any decent pics of how this wiring shoud look?

    thanks,

    Phil

    Re:Problems with J5 build...


    I think the problem may be in the wiring of the tone stack, I'm going to check that (for the fifth time!) tonight.

    By touching the pins on the tubes, I can create a bit of pop and buzz throught the speaker, for what it's worth.

    ???

    Re:Problems with J5 build...

    Don`t worry Phil - please procedd as suggested and make pics and definitely a voltage chart of all PINs for all sockets (be happy - just three here :D ). Thats always useful.

    Read also the B+-line step by step from the first filter down to PIN 1 and 6 of V1.

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