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 Post subject: ABC battery eliminator kit K-101A
PostPosted: Nov Thu 07, 2019 6:53 pm 
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Joined: Nov Thu 07, 2019 6:43 pm
Posts: 3
I just finished the battery eliminator kit K101A from Antique Electronic Supply and it came on with no problems except the B voltages are off: 22V is 25.5, 45V is 48.5, 67V is 71.5, 90V is 94.6, ?V is 118, 135V is 141. My radio is a Philco 38-38. Will these voltage differences cause any problems? Thanks in advance!


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 Post subject: Re: ABC battery eliminator kit K-101A
PostPosted: Nov Thu 07, 2019 9:11 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 375
Location: Bristol TN 37620
The slight differences in voltage shouldn't affect your set. the B string is not adjustable
as the A and C strings are. Check the volts after the radio is running. The load will
probably take it down to the stated levels.


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 Post subject: Re: ABC battery eliminator kit K-101A
PostPosted: Nov Thu 07, 2019 11:38 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 10094
Location: Mountains of Mourne. Ireland.
If you use a power supply disconnect the 900ohm resistor...
viewtopic.php?p=3011902#p3011902

Greg.


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 Post subject: Re: ABC battery eliminator kit K-101A
PostPosted: Nov Sat 09, 2019 1:26 am 
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Joined: Nov Thu 07, 2019 6:43 pm
Posts: 3
Thanks for the replies! Funny thing is I just replaced the 900ohm res cause the original was cooked. I'll disconnect. So the PS only has one C voltage connection (2V adjustable). Do I understand that I will still need to use a battery for the other C voltage of -9V that is required?


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 Post subject: Re: ABC battery eliminator kit K-101A
PostPosted: Nov Sat 09, 2019 3:15 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 7617
Location: Minneapolis, MN USA
The B string voltages vary slightly from nominal because they are determined by the zener diodes. Those zener diodes have a voltage spec where the output voltage will vary by a plus/minus percentage. The zener diodes are in series so each contributes to an overall net variance from the nominal rating.


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 Post subject: Re: ABC battery eliminator kit K-101A
PostPosted: Nov Sat 09, 2019 3:11 pm 
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Joined: Nov Thu 07, 2019 6:43 pm
Posts: 3
It seems a shame to use batteris for the -9V with all those extra voltage outputs on the PS. Can't I just use the 22V output divided in half (accepting the extra 2V) or maybe use a DC converter?


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 Post subject: Re: ABC battery eliminator kit K-101A
PostPosted: Nov Sat 09, 2019 4:17 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 10094
Location: Mountains of Mourne. Ireland.
Follow the link at the top of this post...
viewtopic.php?p=3013805#p3013805

and see (in blue, on the schematic) arf member Burdawg's Voltage divider network modification.

Greg.


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 Post subject: Re: ABC battery eliminator kit K-101A
PostPosted: Nov Sat 09, 2019 5:13 pm 
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Joined: May Sat 30, 2015 11:49 pm
Posts: 861
Location: Keystone Heights, FL, USA 32656
Maybe something like this would work?
Attachment:
DSC03877.JPG
DSC03877.JPG [ 296.7 KiB | Viewed 116 times ]

_________________
Jeff
“Nothin’s worth nothin ‘till somebody wants it.”—Irv Metter


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