Teensy 2.0++ or Teensy 3.1

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cchristoph

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Hello Paul,

I project to build a midi footswitch.

How to choose beetween the teensy 2.0++ or Teensy 3.1 ?

I plan to add some external logic by using by example "BCD to 7 segments decoder" (for a small project I used the 74LS47).
If I buy the Teensy 3.1, must I choose other components.

Charles
 
Suggest using HC series 7400 chips instead of LS, as the CMOS devices should work better with either 2.0 or 3.x Teensys, and will work with a Teensy 3.1 without level-shifting components (74LSxx ICs are 5V only, while T3.0 and T3.1 run at 3.3V only). HC should perform about the same as LS and is generally the easiest of the 7400 families to use today. Note that HCT is different from HC and probably not what you want.

http://en.wikipedia.org/wiki/7400_series#7400_series_derivative_families

http://en.wikipedia.org/wiki/Logic_level

Have fun!
-Dave
 
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