String Ringer

[dubiousss]

Ok so I just finished a Ring Stinger clone, and after a week of debugging ive only a couple of problems left.

schem: http://homepage.ntlworld.com/paul.nelson666/StringRingerv12r.pdf

First it only works with the drive enabled, no cleans (drive set to 0 no sound, .5 driven sound) :\ Ive tried taking out the d1-4 diodes, removing the LDR.

Carrier Freq coming though.

Adjusting the PWM is tricky, I can get an even level on sin/tri/saw but square seems quiter.

The blend pot seems uneven as if perhaps the whole level of the ringmodout is to low. This might be because of the transformers I used http://www.jaycar.co.nz/productView.asp?ID=MM2532&CATID=19&form=CAT&SUBCATID=378 1k:8ohm instead of 20k:1K, perhaps ill look for a NZ source.

Also dont know what this RFU9024 is for but i used a recommended BS250, though it give out the same voltage I put in so i guess its there to stop reverse polarity and not to boost voltage?

Finally does anyone have the original schematic?

[Taylor]

Those are all just aspects of the design. This thing doesn't really do completely clean ring mod. Different levels for the different VCO shapes is normal, but it's usually the other way around - square is loudest, the others quieter.

The RFU is part of RG's polarity protection circuit. It doesn't boost voltage or anything.

Now, I've never had much of a problem with the carrier coming through, because I used a matched diode package. You may want to try that. The trimmer on the diode board is supposed to trim the carrier, give that a try.

[dubiousss]

Perhaps i could remove the Timbre circuitry where there is a volume drop, ands perhaps theres a resistor i could add to ic1/4 to boost the ringmodout...?

[dubiousss]

Ok so /slap in the head, useing the 1k:8ohm transistor sucks cause the single runs straight to ground...