Redpitaya Forum

Well I finally did it. I miss-wired a circuit and pumped 150p-pV into a 1x attenuated HV input channel. I'll try again tonight to measure a basic circuit, but I think it's fried.

Is there any way to repair it? And is there any way to add voltage clamping without effecting the measurement?

Thanks

Oh damn, possibly an expensive mistake.

I you are lucky, it's just the input OP-amp that was damaged. If you are unlucky, the ADC was damaged.
(If you are really lucky, there are already some clamps in the input stage, and those shorted. But that is difficult to tell without the schematics)

In both cases, repairability depends on your ability of desoldering and soldering QFN SMD components. The input OP-amps should be quite doable, QFN 16 is not too bad. The ADC is a QFN 64 package with central ground pad, and that's a bitch to replace without specialized equipment.

fossum_13 wrote:And is there any way to add voltage clamping without effecting the measurement?

No idea, I'd think adding zener diodes might degrade the noise- and possibly also HF-performance.

Bummer. I've attached a reverse engineered input schematic. I found this somewhere on the net.

Hope it is just the amp, but that was a lot of voltage. Are all of the other functions still working?

john

Can u please share the schematic?