Compact DJ Station

General Circuit diagram:




Magnetic Pick-up Amplifier Module




Microphone Amplifier Module



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Mixer Module



Headphone Amplifier Module



General Circuit diagram:
Parts:

P1,P2,P4,P5____22K Dual gang Log Potentiometers
P3_____________22K Dual gang Linear Potentiometer
P6_____________22K Log Potentiometer

R1 to R10______30K 1/4W 1% or 2% tolerance Resistors
R11_____________1K 1/4W Resistor

C1___________2200µF 25V Electrolytic Capacitor

D1_____________3mm. or 6mm. red LED

J1 to J10______RCA audio input sockets
J11____________6mm. or 3.5mm. Stereo Jack socket
J12____________6mm. or 3.5mm. Mono Jack socket
J13____________Mini DC Power Socket

SW1,SW2________DPDT toggle or slide Switches
SW3____________2 poles 3 ways Rotary Switch
SW4____________SPST toggle or slide Switch


Magnetic Pick-up Amplifier Module
Parts:

R1,R10__________2K2 1/4W Resistors
R2,R3,R11,R12_100K 1/4W Resistors
R4,R13__________1K 1/4W Resistors
R5,R6,R14,R15__18K 1/4W Resistors
R7,R16________390K 1/4W Resistors
R8____________220R 1/4W Resistor
R9,R17_________10K 1/4W Resistors

C1,C5,C6,C10___22µF 25V Electrolytic Capacitors
C2,C7__________47µF 25V Electrolytic Capacitors
C3,C8___________2n2 63V Polyester or Polystyrene low tolerance Capacitors
C4,C9__________10nF 63V Polyester or Polystyrene low tolerance Capacitors
C11___________100µF 25V Electrolytic Capacitor

IC1__________LS4558 Dual High Performance Op-Amp


Microphone Amplifier Module
Parts:

R1______________1M2 1/4W Resistor
R2______________5K6 1/4W Resistor
R3______________1K 1/4W Resistor

C1,C3___________4µ7 63V Electrolytic Capacitors
C2____________100µF 25V Electrolytic Capacitor

Q1____________BC550C 45V 100mA Low noise High gain NPN


Mixer Module
Parts:

R1,R2,_________68K 1/4W Resistors
R3,R4_________120K 1/4W Resistors

C1,C2,C4,C6,C8__4µ7 63V Electrolytic Capacitors
C3,C7__________10pF 63V Ceramic Capacitors
C5____________100µF 25V Electrolytic Capacitor

IC1___________TL062 Low current BIFET Dual Op-Amp


Headphone Amplifier Module
Parts:

R1,R5___________18K 1/4W Resistors
R2,R3,R4,R6_____68K 1/4W Resistors

C1,C2,C6_________4µ7 25V Electrolytic Capacitors
C3,C7___________22pF 50V Ceramic Capacitors
C4,C5,C8_______220µF 25V Electrolytic Capacitors

IC1___________NE5532 Low noise Dual Op-amp




Technical data

Sensitivity:
Microphone Input: 3.5mV RMS
Phono Input: 8mV RMS
Line Input: 500mV RMS

Maximum undistorted output:
Main output: 2.5V RMS
Headphones: 1.27V RMS into 32 Ohm load

Frequency response:
Microphone and Line: flat from 20Hz to 20KHz
Phono: according to RIAA curve ±1dB
Headphones: flat from 40Hz to 20KHz; -2.3dB @ 20Hz

Total harmonic distortion @ 1KHz and 1V RMS output:
Line: 0.013%
Phono: 0.016%
Headphones: 0.025%

Total current drawing @ 9V supply:
Standing current: 10mA
Mean current drawing: 13mA