TenTec
[Top] [All Lists]

[TenTec] TT Scout on batteries?

To: <tentec@contesting.com>
Subject: [TenTec] TT Scout on batteries?
From: geraldj@ames.net (Dr. Gerald N. Johnson, electrical engineer)
Date: Sun, 10 Dec 2000 10:55:38 -0600
Sounds to me as if the Scout has a 7810 or LM340-10 regulator for the
VFO. That regulator needs about 2.5 volts headroom input to output to
maintain regulation. Very likely the TO-92 version 78L10. I have no
Scout and no scout manual to see. Perhaps that regulator could be
replaced by a LM2937ET-10 or LM2940-10 or a series resistor and a TL431
family programmable zener diode. The LM29xx family works with down to
0.6 volts drop, the TL431 would work lower though a bit less efficiently
than the series regulator. The TL431 programmable zener diode is a far
better regulator than any plain zener diode.

73, Jerry, K0CQ

--
FAQ on WWW:               http://www.contesting.com/FAQ/tentec
Submissions:              tentec@contesting.com
Administrative requests:  tentec-REQUEST@contesting.com
Problems:                 owner-tentec@contesting.com


<Prev in Thread] Current Thread [Next in Thread>