Power transformer for Green Pre

[bapiano]

While waiting for PCBs to arrive from Peter I've been thinking about what power transformer to get. I think that I've seen mostly the Dagnall D2035 in photos I have found. Is this what most people are using? Is Peters PSU designed around this transformer?

Does anyone use a toroidal with this unit? I read the thread on pros/cons of toroidal but have one in my Hamptone and know that they are used in many other fine mic pres as well.

 

[HappyTom]

I used a toroidal, works like a charm.

HT

 

[clintrubber]

Nice coincidence, right now I'm also looking for which trafo to get for a pair of Green-channels.

That DG2035 is a 6VA unit, 0.2A per winding, has it got enough oomph ?
Joe's (JLM) estimation was around 90mA max per Green-channel
(for the 5532's & some mA's for the NPNs, so excluding additional stuff like the LED-bar etc).

Regards,

Peter

 

[Ptownkid]

Parts express may still have the 5 dollar ones, that's what i used and it works great.

Just search for the thread called "a cheap torroid"

 

[bapiano]

They've got the 14v ones but no 28v are left.

Would the 14v run a 2 channel Green ok? Seems like it should if that little Dagnall 6v can do it.

Bryan, how many channels are you powering with the 28v 'cheap torroid'?

 

[Ptownkid]

2, but i think it's been discussed that it can handle 8 possibly...

 

[peterc]

Here we go again :grin:

I like to allow 100mA per channel for the Green pre, so each channel will draw 30V x .1A = 3VA. The 6VA will work but I'd advise using a 10VA transformer for 2 channels to allow plenty of headroom.

Peter

 

[Ptownkid]

what's the diff between va and vct?


noooooooob

 

[bcarso]

VA: product of rated voltage and rated current.

VCT: "volts center-tapped".