�ke Neehr wrote:

> I�m wondering if there is someone who can help me with this and both
> tell and show me if it�s possible to do this "selfholding" with
> transistors instead ?

  As ever, a bit more info on what you want to do with it might make it
easier to suggest an optimum solution.  A thyristor = "SCR" would likely
be one easy way to do it.

  Note that a thyristor is just like a transistor; you either use it in
common cathode mode with the load in the anode side and a current limit
resistor in series with the switch to the anode supply, or in common
anode mode with the load in the cathode side to negative, in which case
the switch (pushbutton) goes directly between gate and anode.

  Two other things, also like a transistor you generally have a resistor
between cathode and gate to prevent spurious tripping, and a clever way
to turn it OFF using a normally open switch, is to put the switch
between cathode and anode.  Pressing the switch holds the load on, but
when it is released, the thyristor has ceased conducting.

  You know that it is just lack of time that prevents me answering all
your enquiries - if you need circuits to the above, I will have a go at
drawing them...
-- 
  Cheers,
        Paul B.