50W Inverter (CB21485E)

This circuit for a frequency of 40 kHz was found in an old Electronic Design. There were no constructive data for the transformer used in the output.

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Ocean Sound Generator (CB25489E)
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Oscillator triggered by light (CB20355E)
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Bipolar Transistor Colpitts Oscillator (CB4582E)
The oscillator shown in the figure can generate signals between 3 and 15 MHz approximately, depending...