LESHAN RADIO COMPANY, LTD.

3/6

Figure 1. Zero Crossing Detector

(Single Supply)

Figure 2. Zero Crossing Detector

(Split Supply)

Figure 3. Free−Running Square−Wave Oscillator

Figure 4. Time Delay Generator

10

D1 prevents input from going negative by more than 0.6 V.

R1 + R2 = R3

R3

≤

R5

for small error in zero crossing.

10 k

D1

R1

8.2 k

6.8 k

R2

15 k

R3

+15 V

10 M

R5

220 k

R4

220 k

LR393

*

Q

10 k

DQ

Q

LR393

−

+

LR393

51 k

51 k

51 k

10 k

t

0

1.0 M

W

0.001

mF

−

+

LR393

0

0

0

t

‘‘ON’’ for t

where:

Dt = RC n (

)

R

C

R1

t

−

+

LR393

)

*

)

APPLICATION CIRCUIT

LR393