Dangerous Prototypes Open Source Hardware

The ADC speeds (15 and 50khz) are very low though. With the TI ADCs we can do 1msps or 2.5msps which is in DSO nano territory. Eventually we'll do a dual rail parallel ADC at 100msps, but not till we move to the bigger BGA FPGA chip.

The DAC side would be really easy with FPGA pin, agree. Since we're using two in the power supply system I'm quite worried about the noise though. The other two I'd like to put behind a op amp with shutdown and output analog waveforms on two IO pins. Noise is still an issue with the DACs though because they have almost zero PSRR.

• Q5, ZD1, ZD2 and the surrounding circuitry look like a linear reg, but I can't find it's output node.
• does Q6 reduce the ripple on the -0.6V rail, and if so, do you have measurements for that?
• with all your linear regs you a diode from the emitter to the base, what is it for?
• I think some electrolytics have the wrong polarity (C22, C8, C11, C4).

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Gerber viewer
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C:UsersferdinandDesktopGerber Viewerlua5.2nb.lua:149: ...erdinandDesktopGerber Viewerlua5.2enginerender.lua:72: ...DesktopGerber Viewerlua5.2enginedisplayshader.lua:72: GLSL compilation error:
	while compiling ./shadersentity_textured.glsl:
	ERROR: 3:69: 'texture' : no matching overloaded function found (using implicit conversion) 
	ERROR: 3:69: '=' :  cannot convert from 'const float' to '4-component vector of float'
	
stack traceback:
	[C]: in function 'error'
	...DesktopGerber Viewerlua5.2enginedisplayshader.lua:72: in function 'compile'
	...DesktopGerber Viewerlua5.2enginedisplayshader.lua:179: in function 'load'
	...DesktopGerber Viewerlua5.2enginedisplayshader.lua:227: in function 'new'
	...rdinandDesktopGerber Viewerlua5.2enginedisplay.lua:233: in main chunk
	[C]: in function 'xpcall'
	...erdinandDesktopGerber Viewerlua5.2enginerender.lua:67: in function 'display'
	...erdinandDesktopGerber Viewerlua5.2enginerender.lua:125: in function <...erdinandDesktopGerber Viewerlua5.2enginerender.lua:100>
	(...tail calls...)
stack traceback:
	[C]: in function 'error'
	...erdinandDesktopGerber Viewerlua5.2enginerender.lua:72: in function 'display'
	...erdinandDesktopGerber Viewerlua5.2enginerender.lua:125: in function <...erdinandDesktopGerber Viewerlua5.2enginerender.lua:100>
stack traceback:
	[C]: in function 'GetExitCodeThread'
	...sferdinandDesktopGerber Viewerlua5.2enginegui.lua:424: in function <...sferdinandDesktopGerber Viewerlua5.2enginegui.lua:422>
stack traceback:
	[C]: in function 'error'
	C:UsersferdinandDesktopGerber Viewerlua5.2nb.lua:149: in function 'resume'
	C:UsersferdinandDesktopGerber Viewerlua5.2nb.lua:244: in function 'run'
	C:UsersferdinandDesktopGerber Viewergrbv.lua:670: in main chunk
	[C]: in ?
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OK   
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