Digital Remote Thermometer

Transmitter parts:

R1,R3________100K 1/4W Resistors
R2___________47R 1/4W Resistor
R4____________5K 1/2W Trimmer Cermet
R5___________12K 1/4W Resistor
R6___________10K 1/4W Resistor
R7____________6K8 1/4W Resistor
R8,R9_________1K 1/4W Resistors

C1___________220nF 63V Polyester Capacitor
C2____________10nF 63V Polyester Capacitor
C3_____________1µF 63V Polyester Capacitor
C4,C6__________1nF 63V Polyester Capacitors
C5_____________2n2 63V Polyester Capacitor
C7,C8_________47nF 400V Polyester Capacitors
C9__________1000µF 25V Electrolytic Capacitor

D1__________1N4148 75V 150mA Diode
D2,D3_______1N4002 100V 1A Diodes
D4____________5mm. Red LED

IC1___________LM35 Linear temperature sensor IC
IC2__________LM331 Voltage-frequency converter IC
IC3__________78L06 6V 100mA Voltage regulator IC

Q1___________BC238 25V 100mA NPN Transistor
Q2___________BD139 80V 1.5A NPN Transistor

L1___________Primary (Connected to Q2 Collector): 100 turns
Secondary: 10 turns
Wire diameter: O.2mm. enameled
Plastic former with ferrite core. Outer diameter: 4mm.

T1___________220V Primary, 12+12V Secondary 3VA Mains transformer