供暖系统温控器电路

下面是 [供暖系统温控器电路]的电路图
  　　
  
   
  材料BOM表：
  P1 1K Linear Potentiometer
  R1 10R 1/4W Resistor
  R2 1K 1/4W Resistor
  R3 3K3 @ 20°C n.t.c. Thermistor (see Notes)
  R4 2K2 @ 20°C n.t.c. Thermistor (see Notes)
  R5 10K 1/2W Trimmer Cermet
  R6 3K3 1/4W Resistor
  R7,R9 4K7 1/4W Resistors
  R8 470K 1/4W Resistor
  R10 10K 1/4W Resistor
  C1,C2 470µF 25V Electrolytic Capacitors
  C3 1µF 63V Electrolytic Capacitor
  D1,D2,D4 1N4002 100V 1A Diodes
  D3 LED Red 3 or 5mm.
  Q1 BC557 45V 100mA PNP Transistor
  Q2 BC547 45V 100mA NPN Transistor
  Q3 BC337 45V 800mA NPN Transistor
  RL1 Relay with SPDT 2A @ 220V switch
  Coil Voltage 12V. Coil resistance 200-300 Ohm
  J1 Two ways output socket
  SW1 SPST Mains Switch
  T1 220V Primary, 12 + 12V Secondary 3VA Mains transformer
  PL1 Male Mains plug & cable(责任编辑：电路图)