Copicat issues

[jpmorris]

Hi all,

I've just acquired an old MK4 Copicat, which I intend to use in preference to my current digital delay.

However, I have hit a snag. With the digital delay, I have configured it to output mostly the wet sound. On the mixer, I combine the original instrument with sound with the aux return from the delay (since the original instrument can be stereo and the copicat is not).

The copicat outputs both wet and dry, but the dry part in particular appears to be in antiphase with regard to the original signal, so they cancel each other out.

I've never had this kind of problem before. How would I go about inverting the phase of a signal? Would simply switching the polarity of the signal work? (My guess is no, but I haven't tried it).

It would also be nice to stop the dry signal from being output as well. I'm not good enough with electronics design to be able to spot the feed on the schematic.
If anyone here is, the schematic can be found here:

http://britamps.mysite.wanadoo-members.co.uk/watkins/schematics/copicatmk4.html


Any ideas?

 

[Track Rat]

I've never had this kind of problem before. How would I go about inverting the phase of a signal? Would simply switching the polarity of the signal work? (My guess is no, but I haven't tried it).

Yes, if it's just polarity inverted, it would work like a charm.

 

[jpmorris]

Yes, if it's just polarity inverted, it would work like a charm.

Cool. The guy I bought it from had recently changed the output jack, so I did wonder if it was swapped over. I'll give that a try tonight.

 

[jpmorris]

Cool. The guy I bought it from had recently changed the output jack, so I did wonder if it was swapped over. I'll give that a try tonight.

I believe I have established that the 'swell' control changes the wet/dry mix (I thought it was just gain at first). However I am still having phase issues. Reversing the connection kills the signal totally (which was actually what I'd expected) so that didn't help.

Any ideas?