This interesting circuit for SMD assembly appeared in the November 1987 issue of Radio Electronics magazine. The phonons are generated by selected resistors that are fitted to the assembly.
This circuit was found in an English documentation from 1969. The transistors are of the time,...
When establishing the voltage at the input of this regulator, the output voltage rises smoothly until...
To obtain an AND gate we have the configuration shown in the figure. With the values indicated for the...