Browsing the bay the other day I came across this little piece of equipment that I always wanted even before I had a soldering iron: A simple signal generator.
It was sold for parts only, but looked like even I could comprehend the circuit and repair it if necessary.
![](https://i.imgur.com/hZjRwD1.jpg)
A quick test shows it is working:
![](https://i.imgur.com/uvmNSog.jpg)
(Yes, I used the 475 on purpose.
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/xwink.gif.pagespeed.ic.cldandycH0.png)
)
The only problems it has are scratchy potentiometers.
Some pics from the inside - even within the benign housing there's lots of spare room:
![](https://i.imgur.com/bwXxJ1P.jpg)
![](https://i.imgur.com/NEDpgLv.jpg)
![](https://i.imgur.com/nlwgsXl.jpg)
![](https://i.imgur.com/G079z7F.jpg)
And all the 'lytics are still fine!
50 kΩ wire wound potentiometer. I just have to see that (the hair-like wire won't show up on the picture, I'm afraid):
![](https://i.imgur.com/BCE6xP5.jpg)
No way to get at the second pot in front, no opening at all. I cleaned the inner wiper contacts as good as I could and reinstalled it.
Upon turning the signal amplitude doesn't stay constant, but there are no dead spots.
Cleaned up the case and am happy with a nice and easy low frequency generator.
![](https://i.imgur.com/dT192W7.jpg)