[GreenKeys] REC-10 Loop Supply Wiring Diagram

[Roy Morgan]

On Dec 16, 2013, at 11:30 PM, Jeffrey D Angus <jdangus at att.net> wrote:

> On 12/16/2013 10:13 PM, Jim Haynes wrote:
>> So it would be a good idea to replace the selenium stack
>> with a silicon rectifier bridge. 
> Be advised that doing so will substantially increase the output
> voltage if the equivalent series resistance that the selenium
> rectifiers have is not added in series with the new silicon diodes.

Thanks to Jeff and Jim for advice and information and to Don for sending a schematic.

The transformer has two sets of taps: “Coarse” and “Fine”  It could be that with those set to lower than normal settings the voltage will come out right.  Replacing the selenium stack with a modern bridge block will be easy.  A series resistor to replace the selenium stack forward resistance makes sense.

The thing includes a “ .3 amp fusestat”, so the rating is likely 200 ma.

It may be that the two caps (2 and 10 uF) involved in the regulating function are oil caps - I’ll have a look when I can.  I think I have recently seen some higher voltage electrolyitcs around, so will investigate that tomorrow.  The output filtering cap is 200 uF on the schematic, but no voltage rating is shown.

It is pretty clear that this thing is meant to operate 24/7 continuously.  I have come across a loop supply for the Model 28 machines - it is about one twentieth the weight of the REC-10!

Thanks much.


Roy

Roy Morgan
RoyMorgan at alum.mit.edu
K1LKY Since 1958