1. TR204
DTA114EKA
VL18V
G2
VCC
Y A
GND
G2
U38
MC74HCT14ADTR2G
R246
11k
R243
29.4k
VL5V
R246: 11k is to big for U38
input, change to value less
than 2.2k
Technical Memo
Equivalent Circuit
11OCT2014
Tsuyoshi Horigome
2. G2
C130
G2
VL18V 0.1uF
R138
47k
R139
11k
VL5V
G2
V
V
V-INV
NINV
OUT
V+
U100
LM2903
0s 5ms 10ms 15ms 20ms 25ms 30ms 35ms 40ms
T i m e
V(U101:1) V(R139:1)
1.0V
0.8V
0.6V
0.4V
0.2V
0V
In normal condition OUT = 1, but it
should be 0 for the circuit to work,
change INV with NINV then the circuit
can switch in normal condition