Clearly in need of something to do - I bought one of those power/volt
etc measurement thingies and came up with this:

Mac Mini Computer 1.25 25W
Mac Mini Computer 1.25 Standby 2W
Mac Mini Computer 1.25 Off 1W
19" AOC LCD Monitor 35W
19" AOC LCD Monitor Standby 4W
Wireless Phone 1W
PC 3200 AMD 110W
PC 3200 AMD Standby/Off 5W
100W Valve Stereo Amplifier 170W
Pure Evoke Digital Radio 5W
Pure Evoke Digital Radio Standby 5W
70W Stereo Solid State Power Amplifier 25W

The curious thing about the SS amp is that it starts at about 63W, then
seems to settle down after a minute or two at 25W.

Volume at either of the amps wasn't high - from zero up to
need-to-raise-your-voice - but consumption stayed about the same.

Carry on ...

Rob

Rob wrote:
The curious thing about the SS amp is that it starts at about 63W, then
seems to settle down after a minute or two at 25W.

Volume at either of the amps wasn't high - from zero up to
need-to-raise-your-voice - but consumption stayed about the same.

Carry on ...

Rob

Power supply reservoir capacitors charging up.

--
Adrian C

Adrian C wrote:

Rob wrote:

The curious thing about the SS amp is that it starts at about 63W,
then seems to settle down after a minute or two at 25W.

Volume at either of the amps wasn't high - from zero up to
need-to-raise-your-voice - but consumption stayed about the same.

Carry on ...

Rob


Power supply reservoir capacitors charging up.


That should take about 1 cycle (ok, maybe 1 and a little bit), but still
only 20ms or so.

Unless the power supply caps needed to reform at startup.

--
Nick

On Tue, 25 Apr 2006 23:51:51 +0100, Adrian C
wrote:

Rob wrote:
The curious thing about the SS amp is that it starts at about 63W, then
seems to settle down after a minute or two at 25W.

Volume at either of the amps wasn't high - from zero up to
need-to-raise-your-voice - but consumption stayed about the same.

Carry on ...

Rob

Power supply reservoir capacitors charging up.

No, that takes less than a second. The effect noted is output stage
bias change as the amplifier warms up.

--

Stewart Pinkerton | Music is Art - Audio is Engineering

Posted Via Usenet.com Premium Usenet Newsgroup Services
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Stewart Pinkerton wrote:
On Tue, 25 Apr 2006 23:51:51 +0100, Adrian C
wrote:

Rob wrote:
The curious thing about the SS amp is that it starts at about 63W, then
seems to settle down after a minute or two at 25W.

Volume at either of the amps wasn't high - from zero up to
need-to-raise-your-voice - but consumption stayed about the same.

Carry on ...

Rob
Power supply reservoir capacitors charging up.

No, that takes less than a second. The effect noted is output stage
bias change as the amplifier warms up.

OK. I stand corrected. :-)

--
Adrian C

"Rob" wrote in message

Clearly in need of something to do - I bought one of
those power/volt etc measurement thingies and came up
with this:
Mac Mini Computer 1.25 25W
Mac Mini Computer 1.25 Standby 2W
Mac Mini Computer 1.25 Off 1W
19" AOC LCD Monitor 35W
19" AOC LCD Monitor Standby 4W
Wireless Phone 1W
PC 3200 AMD 110W
PC 3200 AMD Standby/Off 5W
100W Valve Stereo Amplifier 170W
Pure Evoke Digital Radio 5W
Pure Evoke Digital Radio Standby 5W
70W Stereo Solid State Power Amplifier 25W

The curious thing about the SS amp is that it starts at
about 63W, then seems to settle down after a minute or
two at 25W.

There is often a huge peak right at turn-on due to power supply caps
charging up. As others noted, this should be over with in fraction of a
second.

There may be some response time issues in the measuring device. Most of them
have a lot of averaging.

IME output stage bias networks generally start out cold a little skinny, and
then ramp up the bias as the circuits stabilize. But that could vary.

Rob wrote:
Clearly in need of something to do - I bought one of those
power/volt
etc measurement thingies and came up with this:

Mac Mini Computer 1.25 25W
Mac Mini Computer 1.25 Standby 2W
Mac Mini Computer 1.25 Off 1W
19" AOC LCD Monitor 35W
19" AOC LCD Monitor Standby 4W
Wireless Phone 1W
PC 3200 AMD 110W
PC 3200 AMD Standby/Off 5W
100W Valve Stereo Amplifier 170W
Pure Evoke Digital Radio 5W
Pure Evoke Digital Radio Standby 5W
70W Stereo Solid State Power Amplifier 25W

The curious thing about the SS amp is that it starts at about 63W,
then seems to settle down after a minute or two at 25W.

Volume at either of the amps wasn't high - from zero up to
need-to-raise-your-voice - but consumption stayed about the same.

Carry on ...

Rob


Have you a link to the site where you got it from ?

Dave xxxx wrote:
Rob wrote:
Clearly in need of something to do - I bought one of those
power/volt
etc measurement thingies and came up with this:

Mac Mini Computer 1.25 25W
Mac Mini Computer 1.25 Standby 2W
Mac Mini Computer 1.25 Off 1W
19" AOC LCD Monitor 35W
19" AOC LCD Monitor Standby 4W
Wireless Phone 1W
PC 3200 AMD 110W
PC 3200 AMD Standby/Off 5W
100W Valve Stereo Amplifier 170W
Pure Evoke Digital Radio 5W
Pure Evoke Digital Radio Standby 5W
70W Stereo Solid State Power Amplifier 25W

The curious thing about the SS amp is that it starts at about 63W,
then seems to settle down after a minute or two at 25W.

Volume at either of the amps wasn't high - from zero up to
need-to-raise-your-voice - but consumption stayed about the same.

Carry on ...

Rob


Have you a link to the site where you got it from ?



Hi Dave - it's:

http://www.maplin.co.uk/Module.aspx?...power&doy=26m4

item L61AQ

but I paid about 10 quid - they're on offer from time to time. It seems
to measure watts accurately, but the display is rather dim and ironic
that it uses 'up to' 20W.

Rob

"Rob" wrote in message

Dave xxxx wrote:
Rob wrote:
Clearly in need of something to do - I bought one of
those power/volt
etc measurement thingies and came up with this:

Mac Mini Computer 1.25 25W
Mac Mini Computer 1.25 Standby 2W
Mac Mini Computer 1.25 Off 1W
19" AOC LCD Monitor 35W
19" AOC LCD Monitor Standby 4W
Wireless Phone 1W
PC 3200 AMD 110W
PC 3200 AMD Standby/Off 5W
100W Valve Stereo Amplifier 170W
Pure Evoke Digital Radio 5W
Pure Evoke Digital Radio Standby 5W
70W Stereo Solid State Power Amplifier 25W

The curious thing about the SS amp is that it starts at
about 63W, then seems to settle down after a minute or
two at 25W. Volume at either of the amps wasn't high - from zero up
to need-to-raise-your-voice - but consumption stayed
about the same. Carry on ...

Rob


Have you a link to the site where you got it from ?



Hi Dave - it's:

http://www.maplin.co.uk/Module.aspx?...power&doy=26m4

item L61AQ

but I paid about 10 quid - they're on offer from time to
time. It seems to measure watts accurately, but the
display is rather dim and ironic that it uses 'up to' 20W.

Looks like a slightly brain dead version of a product we have in the US
called a "Kill-A-Watt". The US product will integrate energy usage over time
as well.

The 20 watt power usage is probably due to a voltage drop across the
internal current shunt when the full rated current is being drawn.

Arny Krueger wrote:
"Rob" wrote in message

Dave xxxx wrote:
Rob wrote:
Clearly in need of something to do - I bought one of
those power/volt
etc measurement thingies and came up with this:

Mac Mini Computer 1.25 25W
Mac Mini Computer 1.25 Standby 2W
Mac Mini Computer 1.25 Off 1W
19" AOC LCD Monitor 35W
19" AOC LCD Monitor Standby 4W
Wireless Phone 1W
PC 3200 AMD 110W
PC 3200 AMD Standby/Off 5W
100W Valve Stereo Amplifier 170W
Pure Evoke Digital Radio 5W
Pure Evoke Digital Radio Standby 5W
70W Stereo Solid State Power Amplifier 25W

The curious thing about the SS amp is that it starts at
about 63W, then seems to settle down after a minute or
two at 25W. Volume at either of the amps wasn't high - from zero up
to need-to-raise-your-voice - but consumption stayed
about the same. Carry on ...

Rob

Have you a link to the site where you got it from ?



Hi Dave - it's:

http://www.maplin.co.uk/Module.aspx?...power&doy=26m4

item L61AQ

but I paid about 10 quid - they're on offer from time to
time. It seems to measure watts accurately, but the
display is rather dim and ironic that it uses 'up to' 20W.

Looks like a slightly brain dead version of a product we have in the US
called a "Kill-A-Watt". The US product will integrate energy usage over time
as well.


As will this - in what (haha) way is this one 'brain dead'?

The 20 watt power usage is probably due to a voltage drop across the
internal current shunt when the full rated current is being drawn.


Yep, probably.

Rob