Getting Pi or other device to output 0.07v signal

[bennis]

Is it possible to get the Pi to generate a 0.04 - 0.07 volt signal. If not, is there any device (relatively cheap) that can produce a 0.04 - 0.07 volt signal. I am trying to run some test circuits and am having trouble producing a signal that low. Any help would be greatly appreciated.

[scotty101]

No. The Pi's GPIO pins output 0v or 3.3v.

[gordon77]

What kind of signal dc, square wave ?

How much current ? Maybe a potential divider ?

[joan]

A digital potentiometer such as a MCP4922 would probably work. You could use the Pis 3.3V as a reference voltage. 10 bit precision would presumably give steps of 3mV.

[mikronauts]

- use a DAC with a 0.1V voltage reference, which you can generate dividing a 1.024V voltage reference by ten before feeding it to the Aref pin.

- use an appropriate voltage divider on a 0-3v3 or 0-5v dac

- as joan suggested, use a digital port

If you need more current, add an opamp circuit