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- Mon Sep 04, 2017 1:36 pm
- Forum: Module Discussion
- Topic: Using 1N4148 As A Temperature Sensor
- Replies: 1
- Views: 3805
Hi there, I could not see your circuit however, any semiconductor forward voltage will change with temperature. If you look at fig 1 of your datasheet for the 1N4148 you will see that at (for example) 1mA the forward voltage is about 0.7v @ 25c but drops to 0.4v @ 125c. This is quite a small change ...
Hi, I am intending to power the EtherMega from a remote 9v supply using a passive power injector with pins 1&2 and 3&4 of the PoE connector linked . I assume the voltage will be available at the VIN pin (less a diode drop). My question is what is the current rating of the diodes in the RJ45 socket? ...