Found in a 90s documentation, this circuit appears in other configurations on this site. The circuit can be powered with voltages from 5 to 12 V.
This two-channel DC volume control uses a transconductance operational amplifier. The transistors can be...
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...
This is the project we have described, as found in a 1981 documentation. In the figure we show the...