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  1. mastrila

    Mini Metronome

    I would like to build the "Mini Metronome" for my daughter. Sure I could buy one but what's the fun (Besides, I do like to impress my kids). The instructions specify that SW1 needs to be "ganged" with P1. Can somebody please explain what this means and how to do it? I plan to replace Q3 (hard...
  2. mastrila

    Replacement for 3DD15A

    I need to replace a 3DD15A power transistor in my power supply. I have not been able to find one where I live. I think that a 2N3055 might work but I am not sure because, whereas I can understand voltage/current/power limits, when it comes to beta, hfe, and the likes I am completely lost. Can...
  3. mastrila

    0-50V 2A Bench Power Supply.

    Hey everyboby, I have a 36V 6A transformer that could be used to built this power supply. Although it likely will not support a full 50V output, it will greatly expand the range of my battery chargers (based on the MAX 712/713). A few questions: 1) The article...
  4. mastrila

    need datasheet for D711

    I need to replace a power transistor in switching power supply. The only markings on the metal case (TO-3) are "D711". Could it be a 2SD711? Can you help me find a datasheet for it? Mastrila.
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