32led bmp

1+5V

R

'1

CLK V( DO Dl D2

74374

D5 D6 D7 / OE

H

GND

CLK DO Dl D2

81«3M

D5 D6 D7 /OE

GND

470    360

Circuit is designed to be

used on 220V S TRIAC - 4A 400V or similar

T=

x

39

0.01

330

Capacitor: 0.01 uF 400V

Mains Live

Mains Meirtial

Danger: Mains current Keep Isolated at all times

Tomext 74374

Global Circmt L

Overview (błock diagram)

Each ot the 4 74374‘s get a sęperate clock signalfrom the port.

Thesegoto eachoftheir own

optoisolated TRIAC switch • see diagram above.

74374 pinouts
/OE	1	20	UCC
Q1	2	19	Q8
D1	3	18	D8
D2	4	17	D7
Q2	^5 74374	16	Q7
Q3	6	15	Q6
D3	7	14	D6
D4	8	13	D5
Q4	9	12	QS
GND	10	11	CLK

^x To stop the diagram from gettingtoo largo, another 2 74374‘s had beern omitted. as well as the other 31 (!) optoisolated TRIAC switches.

		—U6
3	7	K na
i w.r. i 2n crcssiwŁ I 1		-Ck

MOC3041 pinouts

14

13

W.

25

Małe pług (pins facing you)

Pin assignments foi LPT

GND = 18..25 DO = 2 D4 = 6 C0=1 D1 = 3 D5 = 7 Cl = 14 D2 = 4 D6 = 8 C2= 16 D3 = 5 D7 = 9 C3= 17

^x This circuit canbe contructedforuse with 1-4 74374's -i.e. 8,16,24 or 32 łez. (Ałthough it would be a waste to build the circuit for 8 łez • unless your paraTlel port needs abuffer to dtwe the optoisolaters)