[sdiy] OTA report

[Tim Parkhurst]

Hi All,

Just wanted to report what I found from a recent Google search on OTAs

Two interesting papers on theory and applications, both by
Dr. William R. Grise

Application of the Operational Transconductance Amplifier (OTA) to
Voltage-controlled Amplifiers and Active Filters
http://et.nmsu.edu/~etti/winter98/electronics/grise/wrg.html

Operational Transconductance Amplifiers (OTA) for synthesis of
voltage-controlled active-filter tuned oscillators
http://et.nmsu.edu/~etti/fall98/electronics/grise/griseota.html

*****************
Mouser has the following:
13600 (NJR brand)  16 DIP  .42 ea
13600 (NJR brand)  16 DMP (surface mount) .53ea

13700 (NJR brand)  16 DIP  .72 ea
13700 (NJR brand)  16 DMP  .41 ea

Digi-Key has:
13700N  16 DIP  $1.43 ea
13700D (NJR brand)  16 DIP  .99ea
13700M (NJR brand)  16 DMP  .81 ea

*****************
The CA3280E is shown as ACTIVE at Intersil.com. Price is $3.03ea for
quantities of 100 to 1000 (do I smell a group buy coming on?) Our own Old
Crow has them listed for sale at $4.00 ea, 
http://www.oldcrows.net/~patchell/parts/parts.html

and Mouser has them at $5.23 ea (ouch). 

Search for 5517 at Mouser and Digi-Key turned up nothing. A Google search
was equally fruitless. Maybe I'm missing something basic here. Is this OTA
still available? Is it the same as the 13700 (just a different munfacturer's
number)? Anyway, I just wanted to share my findings with the group as to the
availability and health of the OTA. As you were.


Tim (you can't spell tomato without ota...sort of) Servo

"Imagination is more important than knowledge." - Albert Einstein


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