[silent:arts]
Well-known member
Update: few resistor values in the dbx schematic are wrong :
2nd prototype seems to work correctly.
Some more tests to follow.
2nd prototype seems to work correctly.
Some more tests to follow.
Odd. I mean good. All potentiometers = correct, trimmers wrong way (doesn't matter, but will be changed)culteousness1 said:How did the pot orientation work out?
Is there a way to change the knee on the 903? That would be an excellent addition to this project!TheJames said:One thing I always missed on the 903 vs the 160, is the hard knee.
to follow the original schematic as close as possiblemitsos said:Curious, why the doubled up diodes?
I changed nothing. I only added the option for impedance or transformer balanced output, and added a 202X VCA substitute circuitmitsos said:Any ideas on the knee change? I wish I could help with that, I would already have done it to my original 903s.
haha, me too!TheJames said:Ultimately I always got frustrated with trying to sort out the mess of the 160 schematics and think "another day maybe."
Good point, DBX is pretty good about sharing info, they're one of the only companies with so much free service info of legacy products online. Might be worth an email to them?TheJames said:The new DBX 560a (160 in 500 series) gives you the option of "Over-easy" of hard knee compression. I like the dual meters too (level and gain reduction).
I thought about this too and I think you'd sell quite a few of these to the tons of people who are still using 903s! How's that for an incentive!TheJames said:However since I do have a 900 rack (and a few 903's) I'd be more interested in a 903 retrofit for hard knee.
That is an option, but I'd rather build the Silent Arts 903 with switchable knee! ;D 8) Also, I just saw they have a de-esser based on the 902![silent:arts] said:Well, if you want the hard knee option you should consider buying the DBX 560a.
I can't make much out of the 160X schem on their site, it's all cut up and there is a small sliver missing. Specifically R83 and R84. Do you have a full schematic? Anyway, it seems to me, (someone smarter than me should look at this) one RMS is only used for metering? And the over easy switch is switching between two opamps following the U13 RMS detector. half of U5 and half of U6, the ones surrounded by diodes.Looking at the 160X schematic the side-chain is completely different to the 903, using two RMS converter, one for "over easy" and another for the hard knee and so on. It is not like changing a few resistor values or adding / leaving out a few components.
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