This circuit was obtained in a 1964 Electronic Design. Equivalent modern transistors can be used. The circuit requires a 6 V symmetrical power supply.
April 2017 - The Shields of Seed Grove Modules for Intel Joule can now be obtained from Mouser...
This circuit is from an Electronics Now, American magazine from December 1992. The magazine no...
This circuit is from 1995 documentation, but can be easily assembled today, as the components used are...