From: "ks1u" 
To: "Ron DePack" ,
        "ATM" 
Reply-To: "ks1u" 


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Ron:
     Hello.  It's been awhile since I looked carefully at Mel's circuit, =
and I have not yet built one.  However, as I recall the zener diodes = were
there to prevent reverse voltage from the motors from destroying = the
transistors.  If you didn't use the exact zener diodes, that could =
explain the problem.  Zener diodes are available in many different =
voltage and current ratings and it usually does matter what value you =
use.  You didn't say what values you used, only that you didn't use the =
ones specified.  If you just went down to say, Radio Shack, they usually =
only carry 6, 9 and 15 volt diodes rated at ( I believe) 500 mw, which = is
pretty light weight.  I'd definitely use the diodes specified.

George

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Ron:
     Hello.  It's
been awhile since I =
looked=20
carefully at Mel's circuit, and I have not yet built one. 
However, = as I=20
recall the zener diodes were there to prevent reverse voltage from the = motors=20
from destroying the transistors.  If you didn't use the exact
zener = diodes,=20
that could explain the problem.  Zener diodes are available in many =

different voltage and current ratings and it usually does matter what = value you=20
use.  You didn't say what values you used, only that you didn't use = the=20
ones specified.  If you just went down to say, Radio Shack, they =
usually=20
only carry 6, 9 and 15 volt diodes rated at ( I believe) 500 mw, which = is pretty=20
light weight.  I'd definitely use the diodes specified.
 
George

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