Apart from a bit of novelty value I gotta be honest they didn't get a lot of use... I think the HC-2 got chucked during a house cleanout and the PC-2 was sold on ebay a few years back (and was amazed to get £100 for it). Well now I am kicking myself and wished I'd held on to these two collectables.
So when I saw the schematic of the Amdek PCK100 online (actually a kit form of the PC-2 sold by a Roland affiliate) I decided to try to make one and once again re-live boingy noise heaven.
On the page http://www.effectsdatabase.com/model/amdek/pck100 where I found the schematic I also found a photo of the PCB and decided to try to use it directly. With some manipulation in Paint Shop Pro and the use of Press'n'Peel PCB etching film I was able to make a copy of the board and after working out some workarounds (e.g. using BA6110 instead of ultra-rare BA662A VCA chip) I actually got it to work.. So in case you're interested ..here is how I did it
1) I started off with this photo of the track side of the original PCB
The Amdek user guide gives info on some mods to the board (VCO wave form change, mod waveform change) which I added toggle switches for. Usually the Sweep control is a center tap pot.. I didn't have one so I instead rigged up a DPDT toggle and a resistor to a normal pot so that the same effect could be acheived (although I am not sure it works so well)
The original board calls for a Roland BA662A VCA chip... you won't find one! you can use a similar BA6110 chip but the pinout is different. I found the following worked
- socket 1 connect to BA6110 pin# 4
- socket 2 connect to BA6110 pin# 2
- socket 3 connect to BA6110 pin# 1
- socket 4 no connection. BA6110 pin#3 connected to GND (pin 5)
- socket 5 connect to BA6110 pin#5
- socket 6 connect to BA6110 pin#6
- socket 7 connect to BA6110 pin#7
- socket 8 connect to BA6110 pin#8
- socket 9 connect to BA6110 pin#9