1 W amplifier (CB8948E)

This circuit was obtained in a 90s American documentation. The integrated circuit used is uncommon today. The circuit has a low RFI level.

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Diode Bridge Power Supply (CB4244E)
This is the traditional configuration of an unregulated bridge rectified power source. The circuit...
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In the figure we have a circuit that produces interval pulses, reproduced in the piezoelectric...
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Found in American documentation from the 90s, this circuit passes frequencies above 1 kHz. The...