This 3-digit circuit was found in the 1992 special edition of the Radio Electronics Handbook. The circuit produces a standard voltage for bench testing.
In the figure we have an astable multivibrator driving a speaker to produce audio signals for...
This circuit, which we found in an Argentine publication from the 1970s, uses a large high voltage...
This circuit is from a 1965 General Electric hobby manual. The circuit can be assembled with...