[sdiy] Diode Matching

[Schwarz Raphael]

> 
> 
> Get a single 1N4148 diode.  Stick it in your meter in diode check mode.  Observe the reading.  Leave it for five minutes.  Observe that the reading has changed.  Squeeze the diode between your finger and thumb.  Notice that the reading changes wildly with the temperature.
> 

Wildly is a bit of an overstatement , look up the temperature curve in any 1N4148 datasheet, (https://www.vishay.com/docs/81857/1n4148.pdf <https://www.vishay.com/docs/81857/1n4148.pdf>) you have 200mV over a 90°C range, and less than 5mV if you stick to a normal temperature range. 

So unless you start freezing or boiling your diodes :)

Current has a far larger incidence than temperature.
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