albert22
Full Member level 6

0-30v power supply circuit
I have been looking for a good circuit of a "laboratory" power supply. I finally found this one. That looks fairly good. It features a floating regulator that could be scalable to more voltage. And selects diferent secondaries to keep down the power dissipation at the series regulator.
Specs:
**broken link removed**
Schematics:
http://www.technica.ru/objects/images/scheme/50.gif
I dont understand something:
Please see the the N1 op amp (741C)
As far as I understand this is the voltage comparator
The Inverting input (Pin 2) is connected to the emitter of transistor V26A
This transistor drives relay K2A that switches secondary windings.The base is driven but what it seems a schmitt trigger.
Does this make sense ? I think that there is to be a sample of the output
voltage on this pin. Could this circuit work ? Or may be the schematic is drawn wrong in purpose?
May be this circuit would be useful for others, like me, wanting to build a bench power. If it works.
Regards
I have been looking for a good circuit of a "laboratory" power supply. I finally found this one. That looks fairly good. It features a floating regulator that could be scalable to more voltage. And selects diferent secondaries to keep down the power dissipation at the series regulator.
Specs:
**broken link removed**
Schematics:
http://www.technica.ru/objects/images/scheme/50.gif
I dont understand something:
Please see the the N1 op amp (741C)
As far as I understand this is the voltage comparator
The Inverting input (Pin 2) is connected to the emitter of transistor V26A
This transistor drives relay K2A that switches secondary windings.The base is driven but what it seems a schmitt trigger.
Does this make sense ? I think that there is to be a sample of the output
voltage on this pin. Could this circuit work ? Or may be the schematic is drawn wrong in purpose?
May be this circuit would be useful for others, like me, wanting to build a bench power. If it works.
Regards