Tape recorder oscillator (CB8289E)

Found in National Semiconductor documentation from the 1980s, this oscillator is used for polarization for cassette tape recording heads.

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5 V x 5Aconverter (CB9333E)
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Common base transformer stage (CB22223E)
Found in an old American documentation, this step has as input and output transformers coupling. Two...
MW Wireless Microphone (CB4385E)
This circuit was found in a 1963 magazine, but can still be easily assembled with some current...