🚀 go-pugleaf

In article <5188@burdvax.PRC.Unisys.COM>, coltoff@PRC.Unisys.COM (Joel Coltoff) writes:
> The January (I think) issue of Radio-Electronics in the Ask R-E section
> has a circuit for monitoring a car battery voltage. I was trying to
> understand how the sucker works but get stuck when it comes to the
> 1N470 zener diode. I can't find this past listed anywhere. Is this a
> mistake. The original schematic came from the December 1976 Electronic
> Engineering which our library, of course, doesn't have anymore. Is the
> 1N470 an obsolete part? I sure would appreciate it if someone could
> tell me the voltage of this diode.

	The 1N470 is a zener diode rated at 7.1 volts @ .250 watts.  The
tolerance is +/- 10%.  Today, 7.1 volts is an unusual zener voltage.
	You might consider using a common 1N4736A (6.8 volts) or 1N4737A
(7.5 volts); these diodes are rated at 1.0 watts.  While this zener series
does not offer a 7.1 volt part, one or the other of the above values is
probably good enough since I have specified numbers with a 5% tolerance.

<>  Larry Lippman @ Recognition Research Corp., Clarence, New York
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