Adding a 9V reg supply to dumbleator...

[surfsup]

Has anyone used this tranny from triad? I am thinking it might work for a pedalbaord supply. Seems to put out enough to run several low draw pedals and a couple high draw like loop stations or delay boards (3.6A):

http://system.netsuite.com/core/media/m ... c&_xt=.pdf

(attached in case link doesn't work).

[Jana]

I haven't used that one specifically but I have used that series before. They have never given me any problems.

[surfsup]

Okay so I decided to just add a 9v plug to my dumbleator since the Clator chassis is huge and there's plenty of room.

I figure why not just add another small tranny and some stuff to plug my delay/verb stuff right into the buffered loop with a short cord so they can sit on top of the amp and make cord life easier.

Here's what I think I will do...instead of a FWB off a 12.6VAC tranny, do an 18VCT with a capacitive bridge recto. I figure the bridge will deliver a bit more current and rectified it is 12.6VDC, about perfect for the regulator. Comments?

[img:692:337]http://chicagocadcam.com/ChrisHahn/Dumm ... ly3A_2.jpg[/img]

[Bob S]

Should be fine for up to 2A with decent heat sinking.
Good idea to add one to a dumbleator.

[surfsup]

Yea, was surprised after googling this site there were no references or gutshots. I finally can claim a first!

[Bob S]

I'd like permission to clone this please.

Great Idea!

[surfsup]

Go for it. I am putting it in a Clator chassis so the trannys will be swimming in space...I am debating actually doing two separate supplies. Working on the layout now if I can get all three trannies and parts in there I'm going to put in one 9v and maybe a 12v or another 9v.

I'm looking at this tranny for the 9v tap(s): Xicon 41FJ300 at mouser. $6

[Jana]

Is the ground of this circuit going to be tied to the amp chassis/ground? If so, will there be issues with ground loops? I built a 9 volt supply into an amp once but the 9v was isolated from the amp chassis.

[Bob S]

Could be an issue Jana - good catch.
I like bridge rectifiers for dc. Maybe a 9 volt transformer / bridge rectifier, floating the 9 volt dc supply.

[Super_Reverb]

The 9V output is already floating, no? 9V supply output from regulator has CT ground reference. These two terminals look like a 9V battery.

If you use this to power effects pedals, wont the (-) side of 9V supply be grounded through the patch cable ground?


rob

[surfsup]

I like bridge rectifiers for dc. Maybe a 9 volt transformer / bridge rectifier, floating the 9 volt dc supply.

Why do you like bridge rectos? They deliver less current (though the tranny will be physically smaller usually).

Also, If I recall (being the next day I was looking at trannies), Mouser had only like one 9V tranny and it was a 60mA one. So I started looking at others and settled on the 18 VCT one.

18V should give me approx 12.6vdc after rectification with a full wave

Xicon Transformer:
Primary Voltage: 115VAC, 60Hz
Primary Exciting Current: 40mA (max.)
Secondary Voltage (no load): 20.6CT VAC±0.6V%
Secondary Voltage (full load): 18.0CT VAC±0.6V%
Rated Secondary Current: 0.3 Amp (AC) @ 60Hz

[surfsup]

For the ground, if i use a CT, do I have to ground at the chassis or can I run it to the jack ground as in this:

[img:640:479]http://www.geofex.com/Article_Folders/S ... pyder6.gif[/img]

[Bob S]

I should have said I like bridge rectification for low voltage dc.
Both full wave & bridge have advantages / disadvantages.
Still a great idea.
It will be a while before I can get to adding this, so I'll be interested in how it turns out.

[martin manning]

For the ground, if i use a CT, do I have to ground at the chassis or can I run it to the jack ground as in this...

No problem, you can float the ground. It will eventually get referenced to the chassis through the patch cords.

[surfsup]

Martin thanks for confirming, bob I think i'm going to press forward with the 12.6vct tranny for this. I havent ordered the stuff yet though so it will still take me some time too.