paul_5 Posted March 25, 2013 Share Posted March 25, 2013 (edited) so anyway, I've decided to diarise my fake OC2 (faux C2) build. Step one is to prepare the board by cutting the traces where necessary. All 76 of them... I used a small screwdriver to take out the bulk of the track, and finished the edges with a little kitchen knife. At this point it's worth checking each and every cut with a meter (I used the Diode setting on mine, as it beeps when there is a short). It's time consuming and a bit dull, but it'll save you loads of time debugging the pedal when you've put everything together and it doesn't work... Edited April 27, 2013 by paul_5 Quote Link to comment Share on other sites More sharing options...
dincz Posted March 25, 2013 Share Posted March 25, 2013 It's easier and tidier to use a small drill bit to create breaks in the tracks. Wrap it with tape to protect your fingers and twirl away. Quote Link to comment Share on other sites More sharing options...
Protium Posted March 25, 2013 Share Posted March 25, 2013 Bookmarked. Which layout are you using? Quote Link to comment Share on other sites More sharing options...
paul_5 Posted March 26, 2013 Author Share Posted March 26, 2013 I'm using this one here: http://www.sabrotone.com/?p=1223 two little packets choc-full of components arrived this morning, but it'll probably be after easter when I can make any headway. Quote Link to comment Share on other sites More sharing options...
paul_5 Posted April 5, 2013 Author Share Posted April 5, 2013 (edited) Aiming to start populating the board this weekend - I've also just discovered that I haven't got any 2SK30a trannies, so I'll probabl;y just bung in a pair or 2N5457s and hope for the best... In the meantime, here's a picture of the veroboard with the links and IC sockets on - ready for the actual components... [IMG]http://i1221.photobucket.com/albums/dd471/paul_510/2013-04-05105613_zpsc7ded561.jpg[/IMG] Edited April 5, 2013 by paul_5 Quote Link to comment Share on other sites More sharing options...
paul_5 Posted April 7, 2013 Author Share Posted April 7, 2013 Next installment: resistors and caps all done, just the transistors and diodes to go now... Quote Link to comment Share on other sites More sharing options...
paul_5 Posted April 14, 2013 Author Share Posted April 14, 2013 Finished the board, but no actual 'octave' effect. I substituted the LM324 quad op amp for a TL074, assuming that since the pinouts were the same it would work just as well. It doesn't. I get a clean signal and two muddy, no treble signals through the OCT 1&2 signals. I reckon it needs to be an actual LM324. TL074 is JFET based and I don't think the 324 is. Investigation continues... Quote Link to comment Share on other sites More sharing options...
JapanAxe Posted April 14, 2013 Share Posted April 14, 2013 Subscribed! Quote Link to comment Share on other sites More sharing options...
paul_5 Posted April 15, 2013 Author Share Posted April 15, 2013 LM324s in the post.... Quote Link to comment Share on other sites More sharing options...
paul_5 Posted April 19, 2013 Author Share Posted April 19, 2013 LM324 in position but still getting only wooly/no treble through the OCT 1&2 signal paths. Had a bit of a think about this - the schematic calls for 2 SK30 transistors which are MOSFETs, I think I've substituted them with JFET ones. Oops. SK30s in the post. turning out to be quite costly this - the LM324s were £1.50 for 5 and the SK30s are something like 19p EACH!!! Good job doctortweek.co.uk has loads of vintage/rare goodies on stock. He's on my Xmas card list for sure! Quote Link to comment Share on other sites More sharing options...
paul_5 Posted April 23, 2013 Author Share Posted April 23, 2013 SK30A transistors arrived today. Might get a chance to swap them tomorrow and then (hopefully) it's sub-octave tastic... Quote Link to comment Share on other sites More sharing options...
paul_5 Posted April 24, 2013 Author Share Posted April 24, 2013 So anyways, I've put the proper transistors in now, and it's lovely; OCtave 1 isn't quite as 'driven' as I remember it being on the Boss ones, but I'm more than happy with the sound. Soundclips on the way... Quote Link to comment Share on other sites More sharing options...
paul_5 Posted April 27, 2013 Author Share Posted April 27, 2013 (edited) Finally, and without further ado - [url="http://snd.sc/ZNTxZy"]http://snd.sc/ZNTxZy[/url] sound clips of my Faux C2 build. These were recorded using a fretless Jazz through the OC2 clone straight into Pro Tools 10.3.4. No other effects or processing was used - I just hit record, played and then bounced them out as mp3 files. There's a recording of the fretless line on its own (effect bypassed) for comparison (if you like that sort of thing). Edited April 27, 2013 by paul_5 Quote Link to comment Share on other sites More sharing options...
Myke Posted May 3, 2013 Share Posted May 3, 2013 How much did it cost you to build this in total? If you don't mind me asking of course Quote Link to comment Share on other sites More sharing options...
paul_5 Posted May 4, 2013 Author Share Posted May 4, 2013 It cost less than the cost of an OC2 on ebay, that's for sure. I used an old 120 x 95 aluminium case, sockets and 3PDT switch that I had in my shed, so that saved me somewhere between £16 and £20. The actual components would have probably run to about £20, but again, I already had most of the stuff. The SK30 diodes, and the LM324, 4027 chips etc were probably about 50p each. I'm sure if I totalled it up it would run to maybe £40ish, but that would include 3 lots of p&p as I couldn't buy all of the parts from the one shop unfortunately. Quote Link to comment Share on other sites More sharing options...
Myke Posted May 4, 2013 Share Posted May 4, 2013 [quote name='paul_5' timestamp='1367656446' post='2067938'] It cost less than the cost of an OC2 on ebay, that's for sure. I used an old 120 x 95 aluminium case, sockets and 3PDT switch that I had in my shed, so that saved me somewhere between £16 and £20. The actual components would have probably run to about £20, but again, I already had most of the stuff. The SK30 diodes, and the LM324, 4027 chips etc were probably about 50p each. I'm sure if I totalled it up it would run to maybe £40ish, but that would include 3 lots of p&p as I couldn't buy all of the parts from the one shop unfortunately. [/quote] That's a lot cheaper than a normal one Quote Link to comment Share on other sites More sharing options...
JapanAxe Posted May 6, 2013 Share Posted May 6, 2013 Sounds great! I presume that the 3PDT switch did away with the need to use Boss's buffered switching circuit? Quote Link to comment Share on other sites More sharing options...
paul_5 Posted May 6, 2013 Author Share Posted May 6, 2013 Yup. Quote Link to comment Share on other sites More sharing options...
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