Crowbar Diode... resistance?
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Sinbios

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Is there supposed to be resistance across the crowbar? I had to mangle mine up a bit to fit, and now it reads 180 ohms from cathod to anode o_O. If it's supposed to have this, wouldn't this affect the supply voltage?
 
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peranders

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Do you mean D1?

You can't really talk about resistans in a diode and if you put your DMM on Ohms and measure, this reading will only be true for true resistances.

If you switch over to "diode"/"buzzer" you will read "something" (unimportant) when you have DMM plus wire on plus and minus on minus. If you switch to your DMM cables and have "red" wire on minus you will read less than 0.7 volts, probably around 0.3-0.4 V.
 
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Here is an example of a diodes behavior as the forward voltage is increased.
Unlike a resistor they are not linear devices and their conductivity increases
with voltage.[they are classified as semiconductors]
So if you connect one to an ohmmeter the reading you obtained will depend upon
the voltage the meter applies to the diode.
Generally diodes will require anything form .1-.6v to begin conduction.





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