5Pcs 47 AMP 6V Classic Power Earphone Amplifier PCB DIY Electronic KitFeature:PCB Size: 8.3 × 4.6cmPlate thickness and specifications: 1.6mm KB A grade FR4 boardVoltage: 9-15V DCThis is a DIY kit、 you need to have some knowledge of electronics and ability、 this package does not provide instructions、 please note about this before buying.Installation Notes:1、 7 op amp use NE5532、 scalable OPA2134、 compatible with OPA2604 \/ OPA2132 \/ LME49720 、etc.2、 Suitable 9-15V DC power supply、 depending on the op amp voltage range、 transformer power needs more than 10W.3、 You can use two 9V battery (package does not includes).4、 Potentiometer: 10-50K5、 Power connector VCC means positive voltage、 VDD means negative voltage!          Name       Model       Quantity           Six-ring resistance       47       4           Six-ring resistance       10K       3           Six-ring resistance       4.7K       2           Six-ring resistance       100K       2           LED       LED       1           Film Capacitor       0.1uf 100V       4           CD5-CD6       XXuF 25V       2           CD1-CD3       XXuF 25V       2           CD2-CD4       XXuF 35V       2           Headphone socket       Headphone socket       2           Power socket       P5.08-3       1           Potentiometer       50K       1           IC socket       DIP-8       2           Op amp       NE5532       2   Package includes:5 x DIY Electronic Kit