Re: 2N3055 failure (power supply)


Phil Allison wrote:

<cbarn24050@xxxxxxx


I cant read this circuit very well, it appears to be an emmiter
follower. If thats the case then you have 2 basic problems. Firstly
your output is not inside the regulation loop so your regulation will
be poor. Secondly you have no short circuit protection, or indeed any
current control.


** Nonsense.

The OP supplied a partial schem and STATED that it was a current limited
supply.

Well i guess Phil, one of us cant read.


Both these problems are easily solved by looking at
the application notes for the 723.


** The OP very likely has a schem like figure 4 here:



http://www.national.com/ds/LM/LM723.pdf

Maybe but since he didnt state it its just speculation on your part.



Rsc is probably one of the 0.1 ohm ballast resistors shown in his schem,
resulting in a 6.5 amp limit per 3055 device.

That would be too bad if it was since the 2n3055 wont survive a short
at that current for long.





....... Phil

.

Relevant Pages

  • Re: 2N3055 failure (power supply)
    ... Phil Allison wrote: ... The OP supplied a partial schem and STATED that it was a current ... Seems you cant read a data sheet either. ... PSU design is obviously way over your pointy head - ASSHOLE. ...
    (sci.electronics.design)
  • Re: Controlling a motor in presence of phase shift
    ... Phil Allison wrote: ... What you want is IMHO impossible with your circuit. ... Shaded pole motors are difficult to control. ... ** Triacs are widely use to control the speed of AC fans. ...
    (sci.electronics.basics)
  • Re: Turn off delay circuit
    ... Phil Allison wrote: ... at first, the circuit is completely powered off. ... Then a mechanism maintains the power active, even if the switch has been released. ...
    (sci.electronics.basics)
  • Re: Measuring mA (debate solution needed)
    ... Phil Allison wrote: ... Since you trying to measure LED currents in a given circuit, ... really DON'T want to have the measurement changing the circuit values. ... the world is full of educated derelicts. ...
    (sci.electronics.design)
  • Re: How can I make a spk simulator load
    ... > Phil Allison wrote: ... >>> The rise of impedance caused by the 90 microhenry choke starts at about ... >>> is well up at 10 KHz, ... >> Then the figures are like your circuit. ...
    (rec.audio.tubes)