[sdiy] How can I test an OTA?

[bill berzinskas]

Hey everyone..  

I purchased some OTA's (CA3080) a few weeks ago..  I had an attempt at a few vca's and a filter.  I didn't really have all the parts for the filter, but figured i'd mess with it a bit anyway..   i got it working at one point, then something happened and my expo converter was sending like 10volts..  somewhere i was getting a small short that would take away about 1v per IC.. wierd.. i took it apart and tried a few more times w/ varying success..   i got all the parts for the ms-20 clone i'd like to build, and tried prototyping once, and it didn't work..  checking thru the circuit, i noticed i wasn't getting a signal out the other side of the OTA..  

I've got 2 questions really.  How can i test my OTA's to make sure they're still functioning properly? is there some simple circuit i can make on the breadboard to check them real quick?  Also, what kind of input are these looking for into the offset /bias input?? 

Thanks

--Billie



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