[Elecraft] K1 Dumb Question

[Roger Steyaert, K7RXV]

You also have to consider the power dissipation of the regulators. This 
will vary with the heat sink if any o each of them.

You can connect diodes in series with the power input. The voltage drop 
will e the junction voltage plus the the IR drop due to the current. You 
can find out the total drop by measuring the current drain and going to 
the spec sheet on the diode used. The spec sheets can be found by doing 
a Google search on the part number of the diode used.

Roger K7RXV


Larry wrote:
> 
>>
>> What would happen if you connected the K1 up to say 16 vdc?
> 
> As far as I can tell it would work just fine.
> 
> I went through the  schematics and found all of the components (I hope) 
> that use the unregulated input voltage and researched them on the net. 
> The results are:
> 
> Part            Description   Max Input Voltage
> ZR78L06   6v regulator   20vdc
> LM2930    8v regulator   26vdc
> LM380      Audio Amp   22vdc
> LT1252     Audio Amp    28vdc
> 
> I looks like the 6v regulator is the limiting component at 20vdc max input.
> 
> 73
> Larry
> kb5dxy
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft   
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>