Band-Pass Filter (CB14921E)

This circuit was found in a Poptronics of the 90's. The components can be changed to the desired frequency. The power supply must be symmetrical.

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Peak Recorder (CB25371E)
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High current regulator L200 (CB15142E)
This circuit was obtained in the SGS manual of linear integrated circuits of 1982. The transistor can be...
48 V to 15 V step down converter with 1.5 A (CB1572E)
To operate with high input voltages using a 3-terminal voltage regulator such as the LM340-15, we...