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I have examined the file and it is a very good commercial quality design complete with PC layout and loading diagram. I would estimate it at the Leader brand level with some extras such as LCD frequency readout.
The stability will be set mostly by the passive R and C parts you select.
I built this design from elektor a year ago or so. I think the article is from june 1995, there are other designs at EPE.
If I remémber correctly the PDFs are not to scale, so beware of this if you print it to make your own PCBs. Also check mirror or not mirrored PDF. I guess you have to rescale them, If I can find my printouts I can scan them if someone is interested.
I have build the generator some time ago ( about two years ) just for fun, but I must admit the characteristcs are similat the ones of a commercial generator ( not for sure HP, but average quality )
Could be increased the quality of the sinewave ( actually little bit distorted ) but for amatorial or semi-professional work it is OK.
Respect the old XR2206 is about two decades higher frequency ( started with it with the first number of elektor in 1982 ). About stability is quite good if you use silver mica capacitors ( up to 3 nF ) and a multiturn pot for the frequency.
According to Maxim, the MAX038 is no longer available and they know of no suitable substitute. Futurlec (h**p://www.futurlec.com) shows them for $19.90 each. I'm seriously considering getting a couple of them before the supply dries up completely.
A search of Google for ["function generator" build MAX038] got me a lot of good hits.
One of them was for a microcontroller controlled MAX038 that looked really capable if you are familiar with microcontrollers.
I'm thinking of building a box with the MAX038 and an ICL8038 to provide sweep capability.