Linear regulator any question

[Astrid]

Can someone explain fonction of the resistance R229,230,217,231 and R205,210,220 in this circuit diagram

 

[rfredel]

Hello Astrid,

please attached the circuit, else nobody can help you.

Regards

Rainer

 

[mir.ku]

Describe the device from which comes this scheme

 

[Astrid]

OK device is output section of profesional laboratory power supply. I would say that it is a linear regulator.

 

[rfredel]

Hello Astrid,

do you have a schematic of the circuit, or give the type of the Power supply and the manufacturer.

Regards

Rainer

 

[Astrid]

I do not have to scan other parts in electronic form.
I do not think it would be important
+RAILis +60V
-RAIL is -10V from transformer
CONTROL is drivet from error amplifier, this amplifier drive voltage or current betwen +Out and centr +Rail / -Rail
Funcion in CV mode, Error amplifier over Control signal drive XQ 201,3,7 so had to +OUT the required voltage 0-60V.

 

[mtwieg]

I assume that R229-231 are on the schematic because Q202 Q204 Q206 and Q208 are optional, and adding in those jumper resistors bypasses them. R217 is just there so the op amps don't have to drive a capacitive load directly. R205, R210, R215, and R220 seem to just be there as pullup resistors, but it looks like they're not really necessary for the circuit to work.

 

[Astrid]

Super, whole night I was thinking what are the resistors R209, ... and this logical solution occurred to me
R205,210,20 have different values ​​do not affect current or somehow something at the XQ transistor?
Resistors in the base of the NPN POWER XQ201,3,...
In original have every XQ 2x0,25Ohm in serie (R225+ R201,etc..
When I use on place XQ201 MJ15003, I could reduce the size of these resistors?
I have no resistor 250m Ohm, but I have 100m Ohm.
Thank you for the clarification R209.