electronics circuit

Tag Archives: Intercom

Full-duplex Intercom PCB for your office and house

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 [...]
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Practical Application – Intercom Circuit

By admin | Published: 11/28/2009
The simple switch shown so far can be used in simple audio applications. Here is a simple “all-master” intercom circuit that steers an audio amplifier towards one of several distant receivers. All units shown are identical and are connected to the same multipair cable. One battery powers all units. You press the button corresponding to the [...]
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