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Sanity check on an external transformer box.
Sanity check on an external transformer box.
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Old 9th January 2008, 12:53 PM   #1
InSides is offline InSides  Macedonia
diyAudio Member
Join Date: Oct 2004
Default Sanity check on an external transformer box.

Hi all,
recently I've been trying to rearrange my system and direct some funds towards upgrading my analog components. Doing so means acquiring a Pro-Ject RPM 9.1 table, a Pro-Ject Speed Box SE and a Pro-Ject Tube Box SE.

While I can not complain of the sound quality of Pro-Ject components, a pressing and constant issue are their flimsy outboard AC wallwart boxes that either introduce hum to the system unless placed on a dedicated line or fail within a matter of weeks.

I've grown tired of moving them around sockets or replacing them, so I thought about having an external transformer box built for the Speed Box and the Tube Box with a custom toroidal transformer. My logic says that seeing the requirements of the two components are 16V/1A AC, I should be able to achieve this with a single toroidal transformer with dual secondaries [one for each component] and a AC power line filter to isolate the transformer.

This box would only house the transformer, the AC filter and two outlets for the aforementioned components, as well as a proper IEC inlet. So, a few questions:

1. Would the above work? Seeing the components require AC, shouldn't a simple transformer be enough?

Here are the specifications for both components:

Tube Box SE
Speed Box SE

2. I can't seem to find a 16V + 16V transformer. Would a 18V + 18V work or should I look for a custom wound one?

Looking forward to getting rid of those pesky AC wallwarts.

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Old 9th January 2008, 04:33 PM   #2
woodturner-fran is offline woodturner-fran  Ireland
diyAudio Member
Join Date: Jan 2006
Location: Ireland
You could use a 18+18V secondary Tx, and use a dropping resistor to get it down to 16V.

Is it just 2 wires from the wallwart to the motor?

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