RE: Toroidal transformer query...

Martin,

I don't know the answer to your original question regarding the current
consumption of the 36Vac.

Have you powered the board with +5V to see if there is at least some form of
signal getting to the input of the DAC's? The ac voltage is only used in
the video output section and if you are not getting a signal at the input of
the DAC's then you have problems to locate that do not require the ac
supply.

Just a thought.

Peter

-----Original Message-----
From: Martin White [mailto:martin@guddler.co.uk]
Sent: Wednesday, January 22, 2003 4:48 PM
To: vectorlist@synthcom.com
Subject: RE: VECTOR: Toroidal transformer query...

Sadly not. Two problems with that idea! 1. The cab (and working board) is in
a
different country at the moment (long story), 2) All I have left is
non-working
PCBs, and a scope for the display!

As it will be probably six months before the cab comes back my way I'm after
sitting down with my test setup and trying to fix up three two Asteroids and
one
Asteroids Deluxe boards that I have here that I know don't work. (Hence the
toroidal tranformer).

:O)

Martin.

> Have you tried measuring the current draw from the cabs 18VAC
> with the board running?
>
> AFAIK it's just used to provide reference voltages for the
> DACs and power rails for the op-amps ... might not be too far out!
>
> >
> > From: "Martin White" <martin@guddler.co.uk>
> > Date: Wed 22/Jan/2003 15:49 GMT
> > To: <vectorlist@synthcom.com>
> > Subject: VECTOR: Toroidal transformer query...
> >
> > Following on from one of my previous posts about supplying
> 18vAC for
> > testing Asteroids PCBs out of the cab, I bouhg t a toroidal
> > transformer with 115v/240v primary windings and 2 x18v AC secondary
> > windings. All good so far...
> >
> > Unfortunately I accidentally ordered the wrong part number,
> and just
> > noticed that I've ordered one that's rated at 194mA!! - oops.
> >
> > As I've had this a while now I'm not sure I'll be able to
> exchange it
> > so is there ANY chance at all that 194mA will be enough for the 18v
> > supply of an Asteroids??
> >
> > I just know the answer's going to be "no", but thought I'd check
> > anyway...
> >
> > If not, how much? 1A?
> >
> > Ta,
> > Martin.
> >
> >
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Received on Thu Jan 23 00:22:07 2003