[ARC5] BC-348 Dynamotor

[Mike Feher]

Mark -

 

Can you measure the current drawn on the output of the dynamotor with the
brushes in but without connecting to the 348? Sounds like maybe one of your
re-stuffed capacitors may have blown. Or, just disconnect the dynamotor
output from the base, with the brushes in, and then measure the output
voltage at the dynamotor.73 - Mike 

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell, NJ, 07731

732-886-5960 

 

From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Mark McKeown
Sent: Saturday, January 02, 2016 4:12 PM
To: ARC5 at mailman.qth.net
Subject: [ARC5] BC-348 Dynamotor

 

I appreciate all the suggestions.  I have replaced (restuffed all the caps
in the base of the dynamotor assembly so it shouldn't be the caps.  I am
running the unit on the bench using a 24 volt supply.  The supply is
regulated and isn't pulled down by the dynamotor.  A vibratach says the unit
is running at 5000 rpm which may be reasonable although higher than
specified.  The armature gets hot with the brushes out of the high voltage
end but you can still touch it.  With the brushes in I get 103 volts out
instead of the 226 or so specified.  The entire unit gets too hot to touch
when the high voltage section has the brushes in it.  I disconnected the hot
leads from the dynamotor to the base wiring and still only get 103 volts.
Any more ideas?  Thanks!

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