[amsat-bb] KR400 controller question

[W3AB/GEO]

Nice Paul. Very colorful. Your LED's should last forever.

I converted my Yeasu controllers to LED's years ago but have now gone to RS-232 controllers which use a LCD panel. I'm prepping my station for remote control.

⁣___
Sent from my two way wrist watch
73 de W3AB/GEO​

On Jan 7, 2019, 01:29, at 01:29, Paul <paul at ukdx.org.uk> wrote:
>Thanks George, I tried it with and without the resistor and couldn't
>see 
>any difference with the LEDs so wondered if it was just put in to 
>increase the life of the bulb. I'll leave them in and see how we go.
>
>The controllers now look like this adding a splash of colour to the 
>shack. http://www.ukdx.org.uk/tv/rotator/400s.jpg
>
>Paul
>Sussex Coast. JO00
>
>On 06/01/2019 22:33, W3AB/GEO wrote:
>> Paul,
>> 
>> It appears that one unit uses 28V to  light the bulb & the other uses
>
>> 14V. If the mod is for the unit that is 14V, leave the resistor in
>the 
>> circuit.
>> 
>> ___
>> Sent from my two way wrist watch
>> 73 de W3AB/GEO
>> On Jan 6, 2019, at 03:26, Paul <paul at ukdx.org.uk 
>> <mailto:paul at ukdx.org.uk>> wrote:
>> 
>>     As both my KR400 controllers have blown bulbs I've modified them
>to use
>>     LEDs as per https://bit.ly/2TzeHud  There is however a small
>difference
>>     that I'd like an opinion on as I'm not very electronically
>minded.
>> 
>>     Eddie modified his KR-400RC however on my KR-400 controllers
>there is an
>>     additional 100R between the transformer and bulb. What is its
>purpose
>>     and should I leave it in or remove it when adding the diode,
>limiting
>>     resistor and LEDs shown in the mod?
>> 
>>     CCT grabs showing the difference https://bit.ly/2FbKIo5
>> 
>>     Paul
>>     Sussex Coast. JO00
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