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Uploaded byTsuyoshi Horigome
Equivalent Circuit MEMO(12OCT2014)
This technical memo discusses changes needed to an electronic circuit diagram. The memo notes that the value of resistor R246, which is connected to the input of chip U38, is too large and should be changed to a value less than 2.2k. It also states that the inverting symbol on chip U100 should be changed to a non-inverting symbol in order for the circuit to switch in normal conditions as the output is currently 1 but needs to be 0. Simulation waveforms are included showing the voltage levels over time at nodes U101:1 and R139:1.
Equivalent Circuit MEMO(12OCT2014)
- 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