Power buffer (CB8903E)

Found in a 90s EDN, this circuit uses components from that time. The circuit supplies a current of 100 mA with a 5V voltage.

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Sine and Cosine Oscillator with the 741 IC (CB9513E)
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Using a 4046 PLL, which is not very common nowadays, this circuit was found in the October 1994...
CMOS Logic Switch (CB1276E)
This configuration was found in a 1970s American magazine. The circuit uses both CMOS logic and...