Electronic Morse Key (CB7313E)

This circuit was found in the magazine of radio amateurs 73 in a 90's edition. The components are current and the transistor is of general use.

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50 kHz Fiber Optic Transmitter (CB13533E)
This circuit was obtained in a 1977 technical documentation. The PUT admits equivalent and the...
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High Voltage Pulser (CB6253E)
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