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Construction
13. Electrolytic Capacitor.
Watch the polarity !
C2 : 100µF
14. Fuse holder & Fuse
F1 : 100mA
(slow)
15. Relay
RY1 : VR15M121C
8
16. Electrolytic Capacitor.
Watch the polarity !
C1 : 1000µF
C ...
17. Transformer
F...
TRAFO1 : 12V - 0,1A
18. IC. Watch the position of
the notch!
IC2 : LM324
19. Flat cable
C...
220V
12V
20. Choosing hysteresis
TRANSFORMER
If you desire a small hysteresis
(adjustable from 0,2 to 1°C or
from 0,4 to 4°F), then fit for R24
and R25 a 180K metal film resis-
tor (brown, grey, black, orange).
If you prefer a larger hysteresis
(between 1 and 10°C or 2 and 20°
F, for instance for water heaters
and such-like), then fit a wire link
for R24 an R25.
J3 : FC8 "9 wire"
Small hysteresis
Larger hysteresis
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