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- (, , , ) , :
■ (), , , ,
■ (), , .
:
■ ( );
■ -
.
. 1,
ӳ, -
(). 璺 R1, R2, R3
Rt, . , Rt R1, R2 R3. Rt (. 1,) - ( ). : (a,b,c,d), (a,b,c) (a,d,c)
U Ubd.
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. 1. ӳ.
. , . , , . ,
.
, , Ubd = 0 () . . , - (), , Ubd = 0, . , (.1,) . ³ , (50 ) , - . , .
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(. 1,)
U ,
(-), ( ) ( ). I 1 = I 2 , I 3 = I 4 - , b d,
R1 R3:
Ubd = Ub - Ud = U { R1 /(R1 + R2) - R3 /(R3 + Rt)}. (1)
ϳ ( !!!) (1),
: Ubd = U {(R1 * Rt - R2 * R3)/ (R1 + R2) (R3 + Rt)}. (2)
, , Ubd =0, ,
(2) . , :
R1 * Rt = R2 * R3. (3)
г (3) :
Rt = R2 *(R3 / R1). (4)
R2 ,
, (.1,).
R1 = R3 , R2,
Ubd = 0, -, - Rt R2.
(. 1,,),
.
, (. 2.)
Rp R1 R2, c Ucd , .
(. 1,,) , , (. 2) () .
, Ucd , (2), () , , , 180 Ucd . () , . 90. , . R4 0 180. , . ( ) , . ' , , , (, ), ,
.
䒺
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.
(. 1,) 璺
R ( Rt) , , . : R1 (Rt +2 R) = R2 * R3,
Rt = (R2 * R3 / R1) - 2 R.
. 2.
䒺 R4 .
(.1,), 璺 ( R), . , (. 2) 璺 R, R' 2,5 . ',
: = 2 (R + R) = 5 .
( 20 ) 璺, . 璺 , 璺 . , 䒺 (. 1, . 3).
.3. ' R4 .
, ( . 3), . 璺 , 璺 R ( .1,) :
R1 (R4 + R) = (R2 + R) R3. (5)
( !!!), , R1 = R3 ( ) 璺 R, , 璺 R
, ,
.
R4 .3.