Topic: Denecke ps2/ad20 MOD...continued

[Nick's Picks]

I started this a year ago....shelved it, and now i'm back on it today and nearly completed.
I have not changed the opamps of the ad-20, but plan to.

other than that...simple really.  xlr inputs re-wired to inputs of the ps2 PCB.  ps2 output wires connected to the input of the AD20 PCB.
both power jacks wired in parallel.  9v for both so I can't see why that wont work (if i'm about to smoke this, somebody speak up!)

then its just a matter of making it all fit in the chassis, or i'll have to make a custom lid (clear plexi is what i'm thinking).
should be a nice little low-pro setup.

[spyder9]

Best of luck Nick.  Hope your efforts pay off.  Always loved the combo of the AD20 and PS2. 

[nameloc01]

You're combining the ps2 and ad20 into one chassis?
Denecke has released a two in one box already.Soundpros has it on their website.

[Nick's Picks]

where ? i'm looking and I dont see it.

[nameloc01]

Denecke-ad20-mini

That is what it is,right? Did I misread the info?

[Will_S]

Denecke-ad20-mini

That is what it is,right? Did I misread the info?

No, that's not what it is.  That is an AD-20 with a miniplug input that supplies 9V plug in power, not phantom power.  And it's a stock AD-20 modified by Sound Pros, not a Denecke unit.

[nameloc01]

Hmm. It having mini xlrs (along with the mini in)in threw me off..it appears to only supply 9v... $500.00...?

[Nick's Picks]

right...
9v "plug in power" for ATs, and other smaller mics.  my hack is a real ps2 PCB, supplying very clean 48v phantom.

[nameloc01]

My bad. By all means...carry on. Good luck and let us know how it goes.

[Colin Liston]

right...
9v "plug in power" for ATs, and other smaller mics.  my hack is a real ps2 PCB, supplying very clean 48v phantom.

Very cool.

[Will_S]

Definitely a cool idea.  I wonder if you have to worry about shielding even if you manage to cram both PCBs into the box.

[setboy]

Very cool. If it works i would do it to mine in a second

[Nick's Picks]

not sure...I can put a layer in between the two, maybe (shielding material).

is going to be a tight ass fit, that is for sure.
I can't find my dismantle notes that ID'd certain cables, so I'm at a small road block.  I need to get some info from Denecke.  nothing too difficult.

or, if someone could crack theirs open...I need to know how the wires on the flat "belt" of wires (very PC looking) are split up.  there are more of them than I remember and it isn't as simple (or is it) as 3 for L, 3 for R and 2 for power.  there was another one for a light too, but I dont care about that.

[DSatz]

?? Hooray for convenience, but I wouldn't want to run these boxes both off the same battery except for very short (maybe < 45-minute) recordings. The PS-2 is a very nice supply but it goes through batteries faster than some others, and the noise floor of the AD-20 rises quite audibly as the battery voltage decreases past a certain point.

Also, you probably know this, but the input circuit of the AD-20 can't function with DC across it, so the output capacitors of the PS-2 are a real necessity in this combination. Normally a preamp has input capacitors if it doesn't have input transformers, but in this combination the capacitors are in the output of the power supply instead.

--best regards

[Keyser Soze]

Pretty cool.  Good luck with making it all work in a single tiny box.