[GreenKeys] Model 19 Power Supplies

[w9ddd at tapr.org]

A long discussion about replacing selenium with silicon diodes here:
https://antiqueradios.com/forums/viewtopic.php?t=305477

My take away is you can approximate by putting a 100-200 ohm resistor in series with the silicon.

John, W9DDD


> On Jan 13, 2020, at 4:46 PM, E. <hanyou at xsmail.com> wrote:
> 
> 
> That’s one of the reasons why I have two power supplies on mine… one for the loop and the second for the DC punch side ;) .  Overkill, but better safe than sorry :) ~
> 
> 
>> On Jan 13, 2020, at 4:39 pm, Jim Cooper <jim.w2jc at gmail.com> wrote:
>> 
>> On 13 Jan 2020 at 15:44, Jim Haynes wrote:
>> 
>>> If you're using that rectifier for
>>> loop power as well as for running the
>>> punch you'd need to adjust the loop
>>> current because of the higher voltage.
>> 
>> Keep in mind, also, that the reason for the 
>> regulation in the case of the Model 19 is 
>> that the punch solenoid takes a LOT of current 
>> in sharp, irregular bursts ... which could do lots 
>> of mess with the loop current if not regulated. 
>> 
>> 
>> 
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