New Linear Audio publication!

[mkc]

Hi Jan,

No problem. You have already sent me one Thanks! Much easier to read. I have had in mind checking what the danish postal service dare charging me for returning the first booklet to you.

Mogens

Sorry for delay. Do you have an order number I can re-activate?

Jan

 

[vacuphile]

jackinnj did some measurements on my SilentSwitcher. It really is silent

https://linearaudio.nl/silentswitcher

Jan

That is really impressive Jan, congrats with yet another good design!

 

[mlloyd1]

ditto.

so you know the next question, right?

how do we get one?


mlloyd1

That is really impressive Jan, congrats with yet another good design!

 

[jan.didden]

ditto.

so you know the next question, right?

how do we get one?


mlloyd1

I am looking how to have a bunch of these made in an economical but controlled way.. Those regulator and converter chips cannot reliably be soldered for the average diy-er (or any diy-er probably!). So the only option is to offer this as a complete unit, fully assembled and tested, so you get a guaranteed working unit.

A group buy is an option, but to limit all the admin chores and make for a quick project completion and delivery, I am also looking at Kickstarter. They take 5% but it may be worth it.

I'll try to progress quickly so you can order as a holiday present to yourself

Jan

 

[billshurv]

This is potentially the most dangerous thing you have designed yet. I think all of us need half a dozen of these!

 

[jan.didden]

Well, a known audio designer (also member here) had this to say after using one of the prototypes, and I quote:

"I am very impressed. No hum, no hiss, great sound, very simple to use, compact. I think what you did here is a stroke of genius."

...and no, I'm not embarrassed. Yet.

Jan

 

[bkdog]

Nice work! As soon as I saw the graphs I thought I could use a few of these. Well done Jan!

 

[Mark Johnson]

Ready and eager to purchase 2xAutoranger and 4xSilentSwitcher.

Take my money please!

 

[6L6]

Kickstarter or Group Buy, whatever is easier for you. I'm in for at least 2.

Cheers,

Jim

 

[jackinnj]

I would like to test some polyphenylene sulfide SMT caps with Scott and Cyril's rig. I can see how you do this with the SYS2722, (Sine D/A Var Phase) but for those without, wonder whether an "all pass" filter will deliver the -90⁰ phase shift with sufficiently low THD to make it work.

 

[scott wurcer]

I would like to test some polyphenylene sulfide SMT caps with Scott and Cyril's rig. I can see how you do this with the SYS2722, (Sine D/A Var Phase) but for those without, wonder whether an "all pass" filter will deliver the -90⁰ phase shift with sufficiently low THD to make it work.

A state variable oscillator can provide quadrature outputs, I think. I used two channels of a good sound card set in quadrature. I swept them in frequency to find the exact null (x Hz/sec from AHz to BHz and just measured the time to find the null) a trifle tedious but works. You might need a fine and coarse sweep if the first is way off. It's a vector subtraction so the null is quite steep close in. CoolEdit does all this easily from the make tones menu.

I didn't push the sound card measurements as hard as Samuel did in his presentation and I don't know (doubt) it would go to -150dB.

 

[jan.didden]

I would like to test some polyphenylene sulfide SMT caps with Scott and Cyril's rig. I can see how you do this with the SYS2722, (Sine D/A Var Phase) but for those without, wonder whether an "all pass" filter will deliver the -90⁰ phase shift with sufficiently low THD to make it work.

I am negotiating with Cyril's son to get hold of his father's test equipment, I'll let you know if it pans out.

Jan

 

[jan.didden]

Just as an aside: remember Bob Cordell's KT88 tube power amp from Vol 2? For my own build I designed a small PCB to hold the input- and driver stages. I just posted all pertinent files including the original article here. Anyone wanting a PCB please contact me, one reader has a few spares.

Jan

 

[scott wurcer]

I guess I'm not understanding which article jack is referring to.

 

[6L6]

Jan, could the -15V output of the SilentSwitcher be used alone? I'm thinking about the B- supply in SY's The Equal Opportunity...

 

[bwaslo]

That's a pretty neat gadget, there. For some reason I thought it was going to be a signal switcher/selector and hadn't paid much attention.

 

[jan.didden]

Well, I did it! My SilentSwitcher is now live at Kickstarter!
Looking forward to getting this on the road!

https://www.kickstarter.com/projects/1684029908/the-silentswitcher-mains-free-low-noise-15v-and-5v

Jan

 

[billshurv]

Yay. Well I can't afford one for a few months (daughter #2 to uni), but have chucked a few coppers in to get you going. Fingers crossed you hit the target.

Are you averse to the word being spread around about this. Given your name is inextricably linked with DIY regulators...

 

[jan.didden]

Thanks Bill I saw that! You're the man!

Not averse at all - spread the word! Superreg is good and it's absolute noise level is probably unmatched by anything, but in practical use SilentSwitcher has the advantage of total absence of mains junk while the noise etc is so low as to be inconsequential.

Jan

 

[jan.didden]

Jan, could the -15V output of the SilentSwitcher be used alone? I'm thinking about the B- supply in SY's The Equal Opportunity...

Yes of course, no problem, very good for that. You have a need for the +15 and 6/5/3.3 too?

Jan