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Forward voltage drop of 1N depends on resistance?
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Read times previous topic – next topic. According to the datasheet on4004 forward voltage drop of 1N is 1V. I was planning to use the diode in series with a 6V battery pack to power a ATMegaP, so that I get the voltage below the maximum rating of 5.
But when I connect the diode to the battery pack and measure the voltage at the unconnected end of the diode with a multimeter I get a voltage drop of only 0. If I connect a 10k resistor between the diode and ground, the voltage drop over the diode is about 0. So Datasheey conclude that the voltage drop of the diode depends on the resistance of the circuit.
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I mean, I have so far assumed that the voltage drop of a diode in0404 almost constant but clearly I have been mistaken Related question, is it a good idea to use a 1N to cut down the voltage like I was planning to?
I’m not too eager to try this without first understanding what is going on here. Now with Unlimited Eagle board sizes!
What do you measure with more load, like ohm so 10mA is flowing, which would be more “real-world”vs 0. Just tried it with 1k and ohm resistors and measured voltage drop of 0.
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Ok, after reading the datasheet more carefully, I can see that it mentions that the forward voltage is 1V with 1A passing through the diode. But nowhere it says that the voltage drop is so heavily dependent on the current Hmm, still puzzled by this.
The voltage drop depends on the current, of course. Usually there are graphs in the datasheet showing the drop vs forward current.
A better solution for you is using an LDO voltage regulator instead. The forward voltage drop of a diode isn’t exactly ‘heavily’ dependent on current.
Data sheets often show graphs of forward voltage vs current for several different temperatures. The one I just looked at for 1N shows: I’m sorry, I don’t know how I missed the forward voltage curve in the datasheet. Sometimes the datasheets are so convoluted that it’s hard for me to read them. Again sorry for the noise and thank you all for the responses! The voltage is at 5. So, ok, I’m now looking at MCP voltage regulator as an alternative.
It inn4004 a “voltage drop” of only mV, so it should be better the diode. However, I’m having a hard time locating the part from nearby electronics shops, so any tips for alternative parts are most welcome!
You might consider using a two cell battery and using the below DC to DC switching regulator to step up the voltage to a regulated 5vdc and power the board via it’s USB connector.
I just bought five of them but it will be days until I see them. Yes, voltage drop on the diode is datazheet dependent on the current.