K1 Dumb Question
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Hello,
I have a dumb question and wonder if this might have happen to anyone. What would happen if you connected the K1 up to say 16 vdc? 72 and Thanks, Ron Polityka WB3AAL www.wb3aal.com www.n3epa.org/ K1 - SN 01011 K2 - SN 01392 _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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> -----Original Message-----
> > What would happen if you connected the K1 up to say 16 vdc? > -------------------------- Ron, OK, I'll go out on a limb here and say that probably nothing would happen if the K1 were accidently connected to 16 volts. 20 volts create a problem but I don't believe 16 volts would matter. However, since the spec voltage range for the K1 is 15 volts on the high end, I would not vouch for long term operation at 16 volts. If you have a power supply that is developing 16 volts, put a couple of adequately high current diodes in series on the K1 power lead. 73, Don W3FPR -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.430 / Virus Database: 268.15.3/562 - Release Date: 12/1/2006 1:12 PM _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Hi Don,
The Li-Poly battery I have when fully charged is 16.63 VDC. It will discharge as I am using it. I tried a 13.0 VDC zener diode but with the protective circuitry on the battery it will shut down the battery. I am going to experiment with a resistor in line to lower the voltage. 72 and Thanks, Ron Polityka WB3AAL www.wb3aal.com www.n3epa.org/ K1 - SN 01011 K2 - SN 01392 ----- Original Message ----- From: "Don Wilhelm" <[hidden email]> To: "Ron Polityka" <[hidden email]>; ".Elecraft" <[hidden email]> Sent: Saturday, December 02, 2006 8:12 AM Subject: RE: [Elecraft] K1 Dumb Question >> -----Original Message----- >> >> What would happen if you connected the K1 up to say 16 vdc? >> > -------------------------- > Ron, > > OK, I'll go out on a limb here and say that probably nothing would happen > if > the K1 were accidently connected to 16 volts. 20 volts create a problem > but > I don't believe 16 volts would matter. > > However, since the spec voltage range for the K1 is 15 volts on the high > end, I would not vouch for long term operation at 16 volts. If you have a > power supply that is developing 16 volts, put a couple of adequately high > current diodes in series on the K1 power lead. > > 73, > Don W3FPR > > > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.5.430 / Virus Database: 268.15.3/562 - Release Date: 12/1/2006 > 1:12 PM > > _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by WB3AAL
> > 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: [hidden email] 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 |
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In reply to this post by WB3AAL
I think he meant simple diodes rated to handle the power you will use. Each
biode should have a voltage drop of 0.6V, so 2 would total 1.2V drop and I believe that would be current independent. Placed in series the battery shuld just see it as part of the load and not be concerned. David, k3tue . --- Ron Polityka <[hidden email]> wrote: > Hi Don, > > The Li-Poly battery I have when fully charged is 16.63 VDC. > > It will discharge as I am using it. I tried a 13.0 VDC zener diode but with > the protective circuitry on the battery it will shut down the battery. > > I am going to experiment with a resistor in line to lower the voltage. > > 72 and Thanks, > Ron Polityka > WB3AAL > www.wb3aal.com > www.n3epa.org/ > > K1 - SN 01011 > K2 - SN 01392 > > > ----- Original Message ----- > From: "Don Wilhelm" <[hidden email]> > To: "Ron Polityka" <[hidden email]>; ".Elecraft" > <[hidden email]> > Sent: Saturday, December 02, 2006 8:12 AM > Subject: RE: [Elecraft] K1 Dumb Question > > > >> -----Original Message----- > >> > >> What would happen if you connected the K1 up to say 16 vdc? > >> > > -------------------------- > > Ron, > > > > OK, I'll go out on a limb here and say that probably nothing would happen > > if > > the K1 were accidently connected to 16 volts. 20 volts create a problem > > but > > I don't believe 16 volts would matter. > > > > However, since the spec voltage range for the K1 is 15 volts on the high > > end, I would not vouch for long term operation at 16 volts. If you have a > > power supply that is developing 16 volts, put a couple of adequately high > > current diodes in series on the K1 power lead. > > > > 73, > > Don W3FPR > > > > > > -- > > No virus found in this outgoing message. > > Checked by AVG Free Edition. > > Version: 7.5.430 / Virus Database: 268.15.3/562 - Release Date: 12/1/2006 > > 1:12 PM > > > > > > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > 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 > _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by KB5DXY
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: [hidden email] > 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 > Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by WB3AAL
You could put a switch across the diodes so that you can shunt around them when the battery voltage reaches a safer level.
Paul WD8OJL Roger said: "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" _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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