Found in a 1967 General Electric documentation this circuit uses unijunction transistors that may be equivalent to those indicated. The number of stages can be modified.
This LED special effects circuit was found in the February 1992 Radio Electronics magazine. The...
This low-pass filter with 741 op and symmetrical source was found in the August 1993 issue of...
Using the well-known SAA1027, this circuit serves as interface for PC. No English documentation was found...