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