I ordered a circuit board for a DIY TR-808 bass drum a couple weeks ago.
Here’s a scan of the PCB I received last night. It’s TINY! They’re being sold for $25, as I discovered in the electro-music forum.
808 BD PCB Scan (click to enlarge)
…and here’s a nice clear image of the layout (from the seller’s web site):
808 BD PCB Layout (click to enlarge)