Need 24v Proportional D/A with Dither
Kirk Fraser
Posts: 364
·Hi,
I need a 24 v D/A circuit to drive some proportional servo valves.· Texas Inst. recommended the TLV5610 8-channel D/A as a close reverse of the 11 channel TLC2543 A/D which EME Systems has an excellent Stamp application note on.· So how do I go about developing a similar knowledge?
The problem with proportional valves is they require the digitally scaled output·proportional to the input potentiometer (or whatever) plus 100Hz of dither noise to keep shaking the valve free from sticking points.· So I assume that can be done simply by overlaying the dither onto the signal before it leaves the Stamp.
Does anyone already have a circuit to do this?· Or can they set me onto the right path?
Thanks,
Kirk W. Fraser
·
I need a 24 v D/A circuit to drive some proportional servo valves.· Texas Inst. recommended the TLV5610 8-channel D/A as a close reverse of the 11 channel TLC2543 A/D which EME Systems has an excellent Stamp application note on.· So how do I go about developing a similar knowledge?
The problem with proportional valves is they require the digitally scaled output·proportional to the input potentiometer (or whatever) plus 100Hz of dither noise to keep shaking the valve free from sticking points.· So I assume that can be done simply by overlaying the dither onto the signal before it leaves the Stamp.
Does anyone already have a circuit to do this?· Or can they set me onto the right path?
Thanks,
Kirk W. Fraser
·