Subject:
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Re: learning some electronics
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 6 Jul 2001 05:32:00 GMT
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Original-From:
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Rahul Tarkunde <RTARKUND@PTC.saynotospamCOM>
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Viewed:
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681 times
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Hi,
OA 47 is a germanium diode used in old transistor radios for RF
detection. You can find one in old salvaged radios.
For details please see :
http://members.tripod.com/baec/articles/crystal.htm
For a 3V0 zener diode ( that is 3 Volt zener diode ) you you can use
4-5 silicon diodes (1N4001 in series, commonly available) if the voltage
is not very critical.
---|<|------|<|------|<|----|<|---- 4 or 5 silcon diodes (1N4001)
=
-------|>\|---------- (3.0 volt zener. Note the symbol direction)
Each 1N4001 has a drop of .6 to .7 volts which add up to 2.6V
(average)zener if you use 4 diodes to 3.25 (average zener) if you use 5.
You can go on higher or lower side depending on the application.
regards,
-Rahul
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