| | | 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 : (URL) a 3V0 zener diode ( that is 3 Volt zener diode ) you you can use 4-5 silicon diodes (1N4001 in (...) (23 years ago, 6-Jul-01, to lugnet.robotics)
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