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Question: Cheap pure sine wave genertor 1khz?

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Martin72:
Notchfilter assembled...

The package on the pcb is for SO8, a real small one - But the opa09 I got from mouser is even smaller..
SO8 Variants are out of stock at the moment, so I must wait.
Or assemble the existing one somehow on the board...

RoGeorge:
Worth a try, the smaller one might fit.  Its middle 2 pins can touch their respective PCB pads.  If not, bend them sideways a little, so they can be soldered directly to the middle 4 PCB pads.  If the marginal pads are too close or touching the middle PCB pads, put some Kapton tape underneath the corner pins, then use thin wires to solder the corner pins to their corresponding PCB pads.

Martin72:
Hi RoGeorge,

Got the same thoughts and when everything will go wrong (delivertime too long), I´ll try this out.
Will be a nice surgery under the andonstar microscope.. 8)

RoGeorge:
Indeed, under the microscope it's doable.

Once I've soldered a chip same size as yours 4 times (the chip, a 16bits ADC for a thermocouple, was not working apparently), only to realize after replacing the chip for the 4th time that all the previous chips were in fact OK, just that there were reflections on some data lines while controlling the ADC.  :palm:



The shoddy soldering in the pic is the 4th one, where no care was spent for the look, believing at that moment that all the chips were bad anyway.  It's been years since then, and never properly rework the soldering.  ;D

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