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rosch

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Blog Comments posted by rosch

  5. pcbatterij

    Posted

    yes that's what i meant.

    so you take the outer pins and connect them to pins 4 and 1 of the 9090 connector.

    the inner pins to 2 and 3. they're connected on board according to the 9090 schematic (just checked that on the board with a beeper, too)

    so as printed on your trafo 8 and 10 are one coil, 12 and 14 the other. both have 15V AC. continuity check should prove that.

  6. pcbatterij

    Posted

    usually you'd need to use both coils to generate positive and negative rail. one for positive and one for negative. the middle pins are connected , this is the GND point of your whole circuit. then the positive and negative ends go to the rectifying circuit.

    at least i built a +/- 15V supply and a +/-9V supply that way.

    but i don't know the wiring of your transformer. it should be shown in the datasheet.

    but you can also measure (power not connected) the continuity between the pins and find out which are physically connected

    to each other, and which aren't. also, you can then measure the AC between the pins you determined.

    there are some psu circuits that show how it is done, i believe somewhere here in the wiki.

  7. pcbatterij

    Posted

    cool! so the new boards are green!

    i got mine early december and they're red. i've only built the power supply so far, and all sockets (also for the transistors).

    i haven't made the big order yet, as i was not sure about some cap spacings too, and also not about the type. i was tempted to start soldering in the resistors, as i should have at least most of them in stock.

    i've also bought the rare parts kit from Gaetano.

    in fact i've started so many projects that i just manage to get through all of them step by step, ie very slowly....

    i'll watch your blog!

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