Shuggie's SL-1210 Blog Revived

[Marco]

Basically, I can't offer an opinion on 'who's right' and 'who's wrong'...

And nor should you, 'we' are in no position to be judge & jury!

Absolutely, but AOS must support whoever is deemed to be in the right. In this instance, when I say "I", I mean AOS.

I will not allow the forum to represent anything which is considered as 'underhand', through links to people's websites, or whatever.

Therefore this situation requires to be resolved to the satisfaction of everyone concerned.

Marco.

[DaveK]

Just my two pennorth:
I like Marco, Have no idea of the rights and wrongs, or technical accuracy, of the statemen(s) in question but, having made the statement(s) in the public domain of this forum, Dave should be allowed (obliged even?), to justify the statement(s), or withdraw them, in the same forum - seems only fair to me, IMHO.
Cheers,

[Mike]

Absolutely, but AOS must support whoever is deemed to be in the right. In this instance, when I say "I", I mean AOS.

I will not allow the forum to represent anything which is considered as 'underhand', through links to people's websites, or whatever.

Therefore this situation requires to be resolved to the satisfaction of everyone concerned.

Marco.

Fair enough... I'll bow out of being responsible for any 'deeming' though, if that's OK?

"The AoS court finds in favour of........ "

[Marco]

You're missing the point, Mikey... Anyway, let's leave the two 'protagonists' in this saga now to have their say

Marco.

[Dave Cawley]

I still find it odd that Paul won't ask me directly? I can see, now that he has explained, that it was a "universal" PSU not a SL-1200 specific PSU; and that you would need a multimeter in that case. I don't think that was explained before. I'll amend my website again to accommodate this.

But Paul, please be very specific, exactly what do you object to? Please don't generalise, be scientific please? I really don't think this barrage of complaint is justified without a detailed explanation?

1. And the first thing Paul, could you tell me if you think a PSU designed for a preamplifier would be ideally suited to a direct drive motor. And if so why do you think that?

As I said just now, we are adopting a holistic approach where each modification is designed to compliment the other. In a nutshell, not all of our future modifications will work with third party power supplies.

We have done more than anyone, Marco excepted, to push this fantastic deck and we fully cover all our achievements on our webstite, read the first part by clicking here, and the PSU specific parts by clicking here.

Dave

[Dave Cawley]

Paul

I have a few more questions :-

2. Is your SL-1200 PSU a new design, or a modification to an existing design?

3. Did you look at the waveforms before and after, and what did you observe?

4. Have you kept these waveforms in a EXIF file so that we can all see your measurements?

5. When you talk about feedback, how does yours accommodate a direct drive motor.

I'll have some more questions later.

Dave

[Dave Cawley]

Paul

You were mentioned on this thread in July 2009 and some points raised. All the points below were critical of my PSU. At that time I had not criticised your PSU at all. Although I did say, and that is true, that one should look at things in a holistic way. I also probably said, and this is true too, that our future modifications could only be guaranteed to work with our PSU. Could you elaborate on these points that you made please?


6. Bandwidth limitation: Could you explain what you mean by this, preferably with scope traces so that we could all look and learn please?

7. RF rejection: How did you measure this, power level, frequency and proximity.

8. Transient response: Did you use a SL1200 to measure this, if so can we see the results please? If not could you explain what you mean and could we see the calculations and results please?

Dave

[Alex Nikitin]

How are you supposed to set the voltage to the required value on a variable power supply without a mutimeter, or some other way of reading voltage, Dave? Please answer this question, as I am keen to know how you would achieve such a feat.

Hi Paul,

I think I can answer this one - just use a switch to set up the output voltage to predefined values in place of a potentiometer, and your customers would be able to choose the right voltage without a multimeter.

Cheers

Alex

[Paul Hynes]

Pay attention Dave, Shuggie stated that he required an adjustable power supply from me, and his reasoning behind that requirement, in post 92 on the thread.

I guess you have not read my post number 110 on this thread either. In this post I have clearly stated where I think your statements are erroneous.

In this post I am asking you directly to substantiate your statements highlighted in post 110.

Please clarify WHY you have made the following statements on your website,

“another manufacturer of PSU’s normally used to power preamplifiers decided to have a go at us”
“and about how his PSU reacted to differing loads”
“and how much feedback he used”
“we all know the pitfalls of excessive feedback”
“and motor control has different requirements to a preamplifier”

Please show me where you got the information from, that caused you to make these statements. It is not a lot to ask.

For the record the LM317 can be configured for a variety of different power supply requirements. It is a general-purpose part. Your power supply could, in theory be used for powering other equipment including preamplifiers.

In note 5 of my post 110 I have already asked you to explain the different requirements of motor control and so far you have not bothered to do so. I have an open mind and would like to know more about motor control. Please educate me.

Regards
Paul

[Dave Cawley]

Paul

One thing at a time please.................

I'm sure you know all the answers, so please answer my 8 questions above. Then we will all know the truth.

Trying to deflect the argument by retrospectively asking the same questions is bizarre!

Dave