Always double check the pinout of 2N2222 transistors.

 

The puzzle is why did some swap the C and E locations ?? Aside from just choosing to be anti-social.

 

The puzzle is why did some swap the C and E locations ?? Aside from just choosing to be anti-social.

It would seem that the engineers for one of those companies made no note of what the standard pinout is for an NPN BJT in that plastic package.

 

It would seem that the engineers for one of those companies made no note of what the standard pinout is for an NPN BJT in that plastic package.

It does not seem like an engineering sort of mistake, more like a marketing group revision. A bit like those EVIL center-negative coaxial power connectors. Those packages never provide reverse polarity protection.

 

In post #1, is the signal Vin, rms or peak?

Thanks,

M

 

In post #1, is the signal Vin, rms or peak?

Thanks,

M

I don't know. I don't open asc files.
Post a picture of the input waveform.

 

I don't know. I don't open asc files.
Post a picture of the input waveform.

 

That shows 500 mV amplitude which is 354 mV rms.

 

It does not seem like an engineering sort of mistake, more like a marketing group revision.

Don't see that marketing would have a say in the pinout order of a transistor.
It was likely made by the engineers who specified the package.

 

That shows 500 mV amplitude which is 354 mV rms.

Thanks MrChips!
M

 

One reason transistor pins may have been reversed is preference, If some oddball early concepts were taken literally the confusion might remain.
Is a transistor really happier looking forward? A good simulation can correct concepts that were not developed correctly.
Probably the navy wanted someone who would multiply the base current * hFE, full speed ahead!
Should we always trust a simulation? Would a circuit check involve a little math?

 

Is a transistor is really happier looking forward?

Sorry, but I have no idea what that means.

 

Sorry, but I have no idea what that means.

The face of the guy in the picture. A frown when looking the input, a smile when looking st the output.

 

The face of the guy in the picture. A frown when looking the input, a smile when looking st the output.

Call me dense.
Is there some supposed reason for that?