This circuit was found in an Electronics World of 1969. The components of the time. The operational can be replaced by modern equivalent type.
We find this circuit in a 1995 documentation. It warns when the timing is nearing its end, with...
This percussion circuit was found in an Electronics World of 1968. The transistor may be general...
The circuits shown by figure below are simple stages using JFETs. The gain are 25 and 150...