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HYST1

HYST2

V+

OUT1

OUT2

22k

Ω

1.5M

Ω

22M

Ω

1M

Ω

27k

Ω

V+

1M

Ω

ALARM SIGNAL

FOR DRIVING

LEDS, BELLS,

ETC.

LOW TEMPERATURE

LIMIT ADJUST

+-

5V

470k

Ω

TEMPERATURE

SENSOR

(GENERAL PURPOSE

NPN TRANSISTOR)

10K

Ω

HIGH

TEMPERATURE

LIMIT ADJUST

ICL7665S

FIGURE 16. SIMPLE HIGH/LOW TEMPERATURE ALARM

110VAC

60Hz

20V

CENTERED

TAPPED

TRANS.

4700

µF

601k

Ω

100k

Ω

HYST1

HYST2

OUT1

OUT2

1M

Ω

1M

Ω

7805

5V REGULATOR

5V, 1A

1M

Ω

+5V

POWER FAIL

WARNING

ICL7665S

FIGURE 17. AC POWER FAIL AND BROWNOUT DETECTOR

ICL7665S