HT640 TWS434 transmitter

HT640 TWS434 transmitter



C1


Keypad


GND

IN • RF OUT


P3.1

P1.1

P3.2

PI.2

P3.3

PI.3

P3.4

PI.4

P3.5

P1.5

P3.7

PI.6

PI.7

yo

AZ

X1

RST

|T4

15



S9C2051


TRX1


TWS-434


GND


HT-640


U3


11

itr

tT

~r

~T

~T

J3

■HD

Antenna

0SC2-

AD

13

T4

0SC1

Al

T5

DO

A2

Te

D1

tO

T7

D2

M

Ts

D3 •

T9

D4

te

"70

05

A7

Ti

D6

to

12

D7

to

TC

T

1 c

.1

cl

r_o

l/cc

GND


GN.

U2

VflM V,YTIIT

3

9J1

VIN VUU I

An I

2

MUJ

ad

LT317T


Power


-oi/cc

R2

220 1%


GND


R3

659 1%



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