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Three-way CH Boiler Valve Monitor

Three-way CH Boiler Valve Monitor
In the author’s homeland natural gas powered combination boilers are the standard source of central heating (CH) in private homes. These highly efficient apparatus not only provide heating via the radiators, but also take care of the hot water for the kitchen and the bathroom.
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R1,R2 = 1kOhm
R3,R5 = NTC 10kOhm
R4 = 1MOhm
P1 = 10kOhm trimpot, vertical
C1 = 4.7µF 25V radial
C2 = 10µF 25V radial
C3,C4 = 100nF
T1 = BC547B
IC1 = 78L05ACZ
IC2 = TLC271CP
BZ1 = actieve buzzer (i.e. internal oscillator), e.g. Kingstate KPEG-200A
K1 = adaptpr socket, PCB mount, e.g. DCJ0202
PCB # 130140-1

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