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Messages - ahiddentableau

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How Do I? Beginner's Paradise. / Re: Noob startup component stock
« on: December 22, 2018, 02:05:23 PM »
Welcome to the forum.

Looking at your first post on this, I'm mostly struck by the fact that you've done your homework.  You read enough to know what kinds of parts are generally endorsed by the community and gone through enough BOMs to get a great sense of what you're likely to use and use with good results.  So if you're a newbie, keep this up and you're not gonna be one for very long.  You didn't just do a good job.  You basically hit it out of the park.

mjg pointed out the only obvious things your list missed.  But the only thing I'd add is for those of us who don't live in the USA it often makes sense to bite the bullet and buy a bit more upfront in order to avoid/minimize shipping costs.  So if you're reasonably sure you're going to build a significant number of projects, you might want to buy jacks or ICs 10-20 at a time.  You can get bulk discounts and the shipping savings really add up quick.

Build Reports / Re: Univibe build!
« on: December 13, 2018, 09:20:51 AM »
That enclosure is a beauty.  And the board ain't too shabby either.  Congrats on the build.

General Questions / Re: Replacing tubes
« on: December 08, 2018, 08:30:17 PM »
Power tubes are perishable goods, so it could well be that they're starting to fail and need to be replaced (I'd want to be careful to rule out other causes first, though).  Your other tubes, on the other hand, can and probably will last for decades.  My deluxe reverb still has its original 12ax7s and 12at7s and it's more than 45 years old.  The idea that you should replace all your tubes is an old wives' tale made up by sellers to part you with your money.

General Questions / Re: Question power resistors Airbrake attenuator
« on: December 02, 2018, 10:45:09 AM »
Please do that, since I am planning on building a similar attenuator I'm interested.  Some people seem to really like them (at least for smallish levels of attenuation), others seem to think they sound constipated and dull (but then again that's the same thing the haters say about every other kind of attenuator).  I'd like to know what you think.

General Questions / Re: Question power resistors Airbrake attenuator
« on: December 01, 2018, 10:58:39 PM »
The short answer is that it'll be probably be fine.  Your amp is going to see a little bit more of a load when attenuation is active, but the amount is going to be relatively small.  25 ohms to 30 ohms isn't too much--especially if it's interacting with higher (8 or 16 ohms) loads.  You'll have to recalculate the taps if you want to get the attenuation steps just like the original, but if I was in your shoes I'd probably just build it more or less as is and try it out.  My guess is that you'll be plenty close.

General Questions / Re: Question power resistors Airbrake attenuator
« on: November 30, 2018, 03:56:42 PM »
According to the datasheet there is no 30 ohm version of the tapped resistor cited in that layout.  Do you have a datasheet for the specific one that you've got?

General Questions / Re: Question power resistors Airbrake attenuator
« on: November 30, 2018, 03:40:20 PM »
I'm a little confused.  There are two kinds of power resistors in your layout.  One is tapped, the other is not.  Are you saying you have a 30 ohm normal and a 30 ohm tapped, and that they are the same type as the two shown?

Open Discussion / Re: Is there still color in the world?
« on: November 29, 2018, 10:15:26 AM »
When I read the start of this I thought, "Pppphhhtttt, you think you've got that many boards?"  Then I saw the picture and I immediately thought of this:

Open Discussion / Re: Ikea Plate Reverb
« on: November 22, 2018, 03:53:08 PM »
Thanks for sharing that, trem.  I really enjoyed it.

General Questions / Re: Film Capacitor Kit
« on: November 19, 2018, 11:45:48 AM »
You should learn the relative norms of the pedal building community--it makes buying parts much, much easier.  For film caps (usually used for 1000pf to 1uF), you're basically looking for caps with a 5mm lead spacing.  You have to be roughly aware that some 5mm spaced caps are really tall or wide and might not fit, but basically that's what you want.  If you want a kit, then Small Bear makes a lot of sense because it caters to these norms.  But in the future you're going to want to source your own caps on an individual basis, so when you look up a part on Mouser, as an example, just check the attributes for lead spacing and size and you're off and running.

Aion has a great little overview of parts sourcing that you might find useful.

If there's a better resource for this I hope someone will post it.

Open Discussion / Re: Precision
« on: November 18, 2018, 05:33:54 PM »
I find metric is easier for math, but harder to understand... For example...

Can you conceptualize a pound?, a psi? a psf?  Likely.

But tell me what a kilonewton feels like.  Or a Pascal.  This convenient system of measurement

Then again... what the hell is a slug?

Is that just upbringing though?  I have no idea what a pound is.  I can easily conceptualise a kilogram, and a litre, and can vaguely judge how many metres away something is. 

I have no idea how many miles per gallon my car gets, but I do know how many litres per 100km it uses. 

It was years of wondering what an oz was before someone told me it's pronounced 'ounces'.   ;D

That! A thousand times that! Imperial measurements are so damn illogical if you are brought up with metric. And I reckon its worse for us, because I get the impression that in the US and UK you at least are taught and use some metric in addition to imperial, whereas us Continental heathens are taught only metric. Some things are in imperial for some odd reason, probably because they were invented in the US or UK. TV screens are measured in inches, but I reckon that means little to us other then a bigger number in inches = a bigger screen. And bigger is always better. And feets seem to be still used in aviation. And those crazy mariners love their non-metric nautical terms.

I can't speak for the UK, but my impression is that it's pretty close to the same as in Canada.  When you go to school here you're taught metric just about exclusively, but the culture and (for us, especially) our close proximity to America and American culture means you end up picking up both.  I'm basically equally comfortable in both worlds for this reason.  The result is that you end up using metric in some contexts and imperial in others.  In construction, for instance, it's really common to use imperial.  Commercial, or even at home woodworking, you're probably doing everything in imperial (on tools made for the US market).  But I don't buy any idea that imperial is somehow easier to conceptualize.  I agree that nobody can conceptualize a newton, but we don't ever talk about force.  So that's just based on what you use enough to get a firm hold of. 

Open Discussion / Re: Long term memory - WTF
« on: November 16, 2018, 09:47:55 AM »
By chance (and in all likelihood because our new tech overlords' survillence of my life and interests), this popped up for me this morning.  So there are people like me who are face blind, but there are also people who are facial recognition superstars and apparently never forget a face.  Reminded me of an episode of 60 Minutes I saw years ago about people who can remember every minute of their lives with full recall.  For those who might want to take a "glass half full" view of the subject of memory:

Open Discussion / Re: Long term memory - WTF
« on: November 15, 2018, 11:40:55 PM »
The major reason I never progressed in this hobby was my memory. By progression I mean once I got the easy basics down I quickly realized that I can't seem to recall the more difficult (to me) stuff. Shit simply doesn't stick with me unless I'm going over and over it for months/years on end.

I'll guess I'll probably remain a real good follower of directions and a real good implementer of others ideas and can build them but that is probably as far as I'll be able to go in understanding this electronics hobby.

Knowing my memory has never been good, this goes back to being my 20's, I'm in my mid 50's now, I realize that is just my DNA I guess. While I did get an MBA you would not believe the amount of studying I had to do to accomplish this. I never skipped class, listened and took notes both undergrad and MBA and I'm here to tell you I then had to hit the books and hard. I'm guessing I'm no genius  ;D

But, this makes me want to ask: To what extent do you believe that memory is tied to IQ?

My education is in law, so take that as a disclaimer.  I know a lot of IQ tests are designed to avoid specific factual knowledge, but in practice it matters, and it especially matters for the kind of quasi-IQ tests you need to take to enter the professions or to get ear-marked as management material in the corporate world.  The Wonderlic test is an example.  Memory is a huge factor on that test.  And the reading section of the LSAT and the verbal section of the GRE have major memory test components.  In the reading section you read something at breakneck speed and then rush through questions that mostly based on what you remember from the assigned passage.  You don't have time to re-read.  Can't remember whether the second paragraph emphasized time constraints or sampling errors?  Too bad, no law school for you.  Can you remember the definition of pusillanimous?  No?  So much for grad school.

Are results on the tests strongly corrolated with success in school or in your later work?  Not really!  But hey, we've got to trim the herd in some way, so I guess this is as good as any (that's pretty much word for word for how the dean of admissions at my school justified the system when questioned).  But it's pretty sobering that so much of the gatekeeping in our societies are based to heavily on something like this, particularly in an age when technology is rendering a lot of the emphasize on memory obsolete.

Build Reports / Re: Swedish Chainsaw and Bosstone Builds
« on: November 14, 2018, 07:49:36 PM »
I like the stickman on your bosstone.  Cracks me up.

Build Reports / Re: Lectric-FX Flintlock (A/DA) Flanger
« on: November 14, 2018, 07:47:43 PM »

I haven't had much time to play with it.  I was pretty pumped to get it working and wanted to post it right away. 

First impressions: it sounds really nice, I've built the EM, as well, and I prefer this one.  I ordered a new MM with better frequency range, I'm hoping to get it dialed in even better.  The odd/even control is really dramatic and gives you pretty distinct sounds, one hollow and the other round.  The threshold control is different, you can set up a crazy flange sound and gate it.  The rest is pretty standard flange controls, so, the sound quality would depend on your personal taste.

Well, now you're whetting my appetite.  Thanks for that.

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