colour generator - using couloured light for an effective display

1-06 — elektor january 1980 colour generator using coloured light for an effective display Circuits for producing light effects are well-known — but this one is different. It generates a fairly constant amount of light, shifting slowly through the spectrum. When used for indirect lighting, it produces a beautiful effect that can be useful in all kinds of applications: parties (both indoors and outside), shop windows, or even as a permanent "light play" in the garden. W.H.M. van Dreumel Figure 1. The three primary colours are faded up and down as shown here; the result is light at fairly constant level that runs through the complete spectrum every 7 seconds. The circuit consists of three almost identical sections. The heart of each section is a Siemens IC, type S 566B*, that was originally intended for a touch- activated light dimmer (see Elektor, Summer Circuits 1978, p. 7-90). When the control input of this IC is operated continuously, it will provide a drive signal to the tr...