7/22/2019 Tens to Frecv Convertor Cu Ci 555

1/1

Figure 1 Preceding an NE555 timer with a Miller integrator yields a voltage-to-frequency

converter that costs less than 50 cents.

VIN

0 TO10V

15V

VCC

15V

Q1

Q2

1/3V

CC

2/3V

CCP

1

220k

C1

4.7 nF

C2

100 nF

CONT

TH

TL

UPPER

COMPARATOR

5k

5k

5k

LOWER

COMPARATOR

R1

270k

2

1

8

6

5

7

3

2

3

7

4

4

6

CONTROL

FLIP-FLOP

POWER

OUTPUT

fOUT

OUTPUT

RESET

IC1

TL071

IC2

NE555