By admin | Published: 02/18/2010
P1____ 22K Log. Potentiometer
R1___ 22K 1/4W Resistor
R2,R3____ 100K 1/4W Resistors
R4___ 47K 1/4W Resistor
R5_____ 2K2 1/4W Resistor (See Notes)
R6_____ 6K8 1/4W Resistor
R7________22K 1/2W Carbon or Cermet Trimmer
R8_______ 2K7 1/4W Resistor
C1,C6_____100nF 63V Polyester or Ceramic Capacitors
C2,C3___ _10µF 63V Electrolytic Capacitors
C4________22µF 25V Electrolytic Capacitor
C5________22nF 63V Polyester or Ceramic Capacitor
C7________470µF 25V Electrolytic Capacitor
Q1_________BC547 45V 100mA NPN Transistor
IC1________TDA7052 Audio power [...]
Full-duplex Intercom PCB for your office and house