This circuit from the 80's makes use of two transconductance operationals of the time. Modern equivalents can be used. The circuit does not need to be powered by a symmetrical source.
Unlike the previous one, this circuit uses only one resistor in the base polarization. The...
This conventional LED effects circuit uses integrated CMOS. Today we can achieve the same effects...
This circuit was found in an old American publication. It makes use of an integrated circuit...