In the figure we have the typical circuit of a Baxandall tone control applied to an operational amplifier. The operational can be of any type.
The amplifier presented with the TDA2003 can provide a power of up to 10 W (rms) in a load of 2...
These 6 to 12 V source with current up to 100 mA was found in Radio Electronics magazine from June...
A low frequency divider can be made using common unijunction transistors as shown by the figure...