Do it by self with wiring diagram: simple 741 pre ampli circuit 741 pre circuit control tone ic preamp preamplifier using opamp ampli simple audio amplifier diagram schematic circuits single schematics devreler
4558 Ic Tone Control Circuit Diagram
Low noise pre tone control circuit using 4558 Circuit tone pre low noise control using 4558 diagram ne5532 bass treble mid amplifier board preamp audio circuits pcb layout