Black Jupiter 2000 Function generator circuit.

[Yorkie]

Being obsolete, I'm not sure that the NE527 is that easy to find. However, at this link you can get a pack of 20 for £3.86+£4.31 P&P, £8.17 total, from Bulgaria:

http://www.ebay.co.uk/itm/20x-NE527N-NE5...0479666844

True, you don't need 20, but you could always keep a few and sell the rest on eBay!

Best of luck with it John.