[Elecraft] Astron RS-35A-Output Voltage adjustment?

Wed Jul 30 16:24:01 2003

In most cases there is an internal pot.  In sume supplies this is a fixed
resistor.  It is a common 723 regulator circuit, so it shouldn't be too
difficult to find the resistor to change.

On Wed, 30 Jul 2003, John Webster wrote:

> Does anyone have precise information on if/how/what
> /where the output voltage of an Astron RS-35A linear 
> PS can be changed?  Internal pot?
> 
> Currently, it reads 13.95volts at its output terminals
> without load (same with minor load, i.e. K2 on receive).
> This is measured with a DMM.  Reading on K2 internal
> voltmeter is 13.2v and on my K1 it is 13.3 (for what 
> that's worth).
> 
> I would like to raise the output voltage slightly (14.2v?) 
> so that the PS could float charge the K2 internal battery 
> at 13.8v across its terminals.
> 
> Note: the Astron RS-35A is a 220volt input version,
> but that's on the other side of the transformer :) and 
> should not be different to 120volt versions.
> 
> Any help would be much appreciated,
> 
> Thanks,
> 
> John, N6JW
> 
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