This circuit produces the sound of percussion such as blocks, drum, bell, etc. The frequency depends on the marked capacitors, which can have a wide range of values depending on the desired sound.
The two-channel mixer shown in the figure is the ideal solution for cases where we need an...
Found in Popular Electronics from the 90s, this circuit generates signals in a frequency range set to...
Found in National Semiconductor publication from the 1980s. This gain-100 circuit can be...