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motodd(at)frontier.com
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 Posted: Sat Jul 20, 2013 8:21 am Post subject: Battery capacity tester-was flyback diode, now clock source |
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| Quote: | From: "Eric M. Jones" <emjones(at)charter.net>
There probably should be a "flyback" diode there. Actually I've been searching
the antique shops for an AC plug-in clock and haven't been able to find one.
I went ahead and added the coil diode per yours and Bob's advice. As for
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the clock, I gave up on finding an AC clock. I didn't want an AC
dependent time piece anyway. I just piggy-backed an 8V regulator
(MC7808C) I had on hand and a couple of resistors for a voltage divider
to give me a regulated 1.8 volt supply that seems to work just fine with
the quartz clock I got at Goodwill for $1.
Boy, that 55W light bulb sure gets warm after a few minutes. I bet a
big ol' heat sink and a surplus computer cooling fan would probably
extend bulb life. Back to the workbench!
Mark
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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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| Posted: Sun Jul 21, 2013 5:18 am Post subject: Re: Battery capacity tester-was flyback diode, now clock so |
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| Quote: | From: "Eric M. Jones" <emjones>
Actually I've been searching the antique shops for an AC plug-in clock and haven't been able to find one. |
FYI: That was humor. Humor is a delicate thing and I never use emoticons.
Do Not Archive
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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