This circuit was found in an English publication in 1986, but it can still be implemented by replacing the original transistor with a BC548. The power supply must be symmetrical and can also be 9 V. The LF347 integrated circuit can be replaced by equivalent operational ones. The circuit is for small signals that are switched by the 4016 logic-control, which can also be replaced by the 4066 with less resistance to the signals.
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