STK400-290 Amplifier Material values ​​in the circuit diagram is not selected, but so what values ​​are read in the PCB top view of a beautiful design Amplifier based on the tone control circuit STK400-290 and effects created with the... Electronics Projects, STK400-290 Tone Controlled Amplifier Circuit (audio effected) "audio amplifier circuits, ic amplifier, " Date 2019/08/02