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    0-30 Vdc Stabilized Power Supply

    If Aqmas want to use  mje3055, he could put 5 or more mje3055 in parallel ;)
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    0-30 Vdc Stabilized Power Supply

    Can 2N3055 be replaced with 2N3773 as it was mentioned in other forum? datasheet: http://www.ortodoxism.ro/datasheets2/b/0f582lg1l7hqtexofow7tsggc5cy.pdf
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    Q: about IrDA interface for mainboard

    It can be used to connect two computers or to transfer data from mobile phone to PC and vice versa.
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    0-30 Vdc Stabilized Power Supply

    Hi again  ;D Is that normal that R2 get hot ~60
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    Ignition coil driver circuits and experiments

    I built mine based on this scheme: http://www.electronics-lab.com/forum/index.php?action=dlattach;topic=261.0;id=1708;image I used IRF530.
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    Ignition coil driver circuits and experiments

    Im using that driver posted on 2nd page. I have 25k pots instead of 10k.  :P PS. That ignition coil is from this car:
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    Ignition coil driver circuits and experiments

    Here are some more pictures: I think this ignition coil is from old car.
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    Ignition coil driver circuits and experiments

    Here is little better picture of that ignition coil:
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    Ignition coil driver circuits and experiments

    Hi! Here is my ignition coil There si little more tham 1cm space between wires. I need to fix that driver, because I didnt have samo parts like on scheme. Sorry for bad quality  :P I have captured this images from video recorded on my mobile phone.
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    0-30 Vdc Stabilized Power Supply

    That was it, thanks ;D It was cold joint at D1  :-[
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    0-30 Vdc Stabilized Power Supply

    Hi I have checked C3 and it is not shorted, yes I have 4 rectifier diodes. My D5 is also installed corectly. Transformers terminal #2 is not grounded.
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    0-30 Vdc Stabilized Power Supply

    that colored ring is pointing to ground (0V) ??? Here are some more measurments on -5.6V elements: Ud5=266mV Ur2=0V Ud6=420mV Ur3=5mV Ur14=-220mV (common of instrument was on Q1 base) Uc2=40V (common of instrument was on negative of cap.) Uc3=650mV (common of instrument was on negative of cap.)
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    0-30 Vdc Stabilized Power Supply

    Voltage across D7 is 0.71V  :o
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    0-30 Vdc Stabilized Power Supply

    I have desoldered -5.6V elements and measured them, but they are working properly. Im not sure for D7 zener, because I don't know how to measure reverse voltage (5.6V).
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    0-30 Vdc Stabilized Power Supply

    Is it possible that that was caused because that short circuit? Elements on -5.6V are D5, D6, D7, C3, R3, R14?
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    0-30 Vdc Stabilized Power Supply

    hi again Yes, I have two 2N3055 with emitter resistors for Q4 U2 gets hot after few minutes. There are no poor solder joints around C1. It is possible that there was short circuit on one of 2n3055 between emittor and base or collector.
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    0-30 Vdc Stabilized Power Supply

    Hi, I have built this PSU few months ago with modified parts (with no casing). :P Few hours ago I have plugged it and spark came out near C1. Now output is ~0.42V and I cannot set any voltage. :'( I Have done few measurments: Q4: Ucb = 39.5V Uce = 39.5V Ube = 0V U1 (pin4-6) = 11.35V U2...
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    0-30 Vdc Stabilized Power Supply

    HI I went to city and bought 2N3055, but they didnt have TIP31 so I bought TIP41 http://pubpages.unh.edu/~aperkins/pdf/TIP-devices/TIP31.pdf TIP31 datasheet http://pubpages.unh.edu/~aperkins/pdf/TIP-devices/TIP41.pdf TIP41 datasheet TIP41 is similiar to TIP31 but is made for higher power...
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    0-30 Vdc Stabilized Power Supply

    But is it possible to use 2N2219 with modified parts? I was just asking this, because I dont have TIP31 yet. As soon as I will get out to city Ill buy it and another 2N3055 (have heatsink for 2 of them). :P
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    0-30 Vdc Stabilized Power Supply

    Thanks for your fast response :) Yes, free samples are nice and I also get them very quick  :P one more question, could be anything wrong, because I am using 2n2219(w/ heatsink) instead of TIP31 with modified parts written in a text file few pages back?
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