Easy programming for the DSO Quad

[c.wilt]

jpa:

@jpa

Good to know! I haven’t noticed that, but it makes sense as the 3.6V supply voltage is not regulated. It may be that the battery charge level also affects it a bit. But it shouldn’t be very large effect because it is only the opamp supply voltage and not any reference voltage.

I wonder if it could be used to improve accuracy more. Compare current voltage against that of when it was calibrated. Would need to test at various voltages to check for linearity but I think it could be an improvement to your already good calibration system.

jpa:

@jpa

Nice! Perhaps the 51 ohm internal resistor on the waveout is enough, so you don’t need separate resistor for the RC timer?

I doubt 51 ohms would work across a wide enough range but it will need to be considered in the calculations.