Offset and scale a DAC output with opamps
This should do it.



Tuning procedure:

1) Set range pot to about mid setting.

2) Set DAC output to 0V and then adjust offset pot to get minimum oscillator frequency.

3) Set DAC output to 5V and then adjust range pot to get maximum oscillator frequency.

You may then need to repeat steps 2 &amp; 3 two or three times to bring it in exactly.

EDIT

With R2 = 10k as shown the op amp's output will probably saturate unless a single supply op amp is used. If you change R2 to 6k2 then you probably won't need a single supply op amp.