Personal amplifier (CB8928E)

This circuit was found in a 90s Popular Electronics. The integrated circuit used is uncommon today. The power is about of 2 W.

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Time relay (CB22074E)
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In the figure we present a circuit that has an insulation voltage of 2,500 V at 60 Hz and...
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The circuit shown is based on National Semiconductor buffers and was found in the 1994 Linear...