115VAC

OR

220VAC

C1

T1

L

C2

R1

R2

R3

C5

D1

1

2

3

4

8

7

6

5

C3

C4

+

LS7231-4

G

MT2

MT1

Z1

-

R4

OUT

TO

LAMP

AC ON-OFF SWITCH

PUSHBUTTON

SWITCH

FIGURE 8. A SWITCH-OPERATED LAMP DIMMER

(SEE NOTE

)

NOTE: Operation is independent of Line Plug Polarity

C1 = 0.15µF, 200V

C1 = 0.15µF, 400V

C2 = 0.22µF, 200V

C2 = 0.1µF, 400V

C3 = 0.047µF, 25V

C3 = 0.047µF, 25V

C4 = 470pF, 25V

C4 = 470pF, 25V

C5 = 47µF, 25V

C5 = 47µF, 25V

R1 = 270

Ω, 1/4W

R1 = 1K

Ω, 1/4W

R2 = 1.5M

Ω, 1/4W

R2 = 1.5M

Ω, 1/4W

R3 = 100

Ω, 1/4W

R3 = 100

Ω, 1/4W

R4 = 1M

Ω, 1/4W

R4 = 1M

Ω, 1/4W

D1 = IN4148

D1 = IN4148

Z1 = 15V, 1W (Zener)

Z1 = 15V, 1W (Zener)

T1 = Q4008L4 (Typical)

T1 = Q5004L4 (Typical)

L

= 100µH (RFI Filter)

L

= 200µH (RFI Filter)

115V

220V

7231-4-032995-8

APPLICATIONS:

1. Foot-Switch Dimmer for large floor lamps.

2. Hand-Switch Dimmer for end-table lamps.

The information included herein is believed to be

accurate and reliable. However, LSI Computer Systems,

Inc. assumes no responsibilities for inaccuracies, nor for

any infringements of patent rights of others which may

result from its use.