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The LM383 Story

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Re: The LM383 Story

#61

Post by jimnotgym »

JohnBooty wrote: post #49
jimnotgym wrote: post #42

Earlier quoted context omitted.

I would love a C-note or the Overnight Sensations . Unfortunately UK shipping is a bit pricey! $90...

The C-Notes are still a bargain at that price! There's about $80 worth of drivers in there, which is bonkers for a $100 kit that also includes crossover parts and MDF cabinets. For comparison, the $130 Overnight Sensations kit contains about $55 worth of drivers. That's a good deal, and consistent with other DIY kits... and it illustrates what an outlier the C-Notes are. (The reason why the C-Notes are so affordable…

I need to hunt around for a cheaper shipping forwarder I think...

Re: The LM383 Story

#62

Post by starbeast »

weinzierl wrote: post #56
starbeast wrote: post #55

Earlier quoted context omitted.

>I only know that because I sometimes read screenplays, for movies that interest me. It's fun and doesn't take as much time as it does to watch the movie. I don't know why I find this as hilarious as I do, but thanks for sharing. Personally, I haven't read many screenplays, though I did read the original one for Monty Python and the Holy Grail and it bears very little resemblance to the final film. There's a whole se…

It wasn't in the Holy Grail, as far as I remember, but they actually did that sketch: https://www.youtube.com/watch?v=nmKped3yARQ

It was in the first draft of the Holy Grail screenplay. Mr Arthur King finds the grail at the Harrods ant counter.

I am guessing that the Harrods sketch is from the fourth series and is repurposing some of that material.

Re: The LM383 Story

#63

Post by aidos »

voltagex_ wrote: post #54
aidos wrote: post #8

OT but it seems like a good place to ask: this week I’ve been looking into making a wireless speaker similar to a Sonos play:1. In terms of the streaming mechanism is was going to use a raspberry pi running as a snapclient, wired to a class-d amp board and a, say, 3” driver. I thought I would find a load of projects using a pi + amp + driver in a small box combination, but I must be looking in the wrong place. Does a…

I wish I had half a million bucks to dump into Snapclient - it's so close to being good, but needs some automated way to get the multi-speaker delay down to a good level. In regards to your project - it depends how many sub-projects you want to spawn. I've got https://www.ebay.com.au/sch/i.html?_from=R40&_trksid=m570.l1... hooked up to my PC and some old speakers - 3.5mm jack, USB DAC and Bluetooth support. It's vari…

Do you remember what you ran into with the multi-speaker delay? I managed to get it all working pretty nicely on my 2 speaker test.

Re: The LM383 Story

#64

Post by justtopost »

fernly wrote: post #43

"My neighbor had just got a dog that was always barking. So I got tweeter, built up a simple 30kHz oscillator using a LM324. Set the two LM383 to swing rail to rail. Got a lantern battery that could put out the power. Then connected the tweeter." Paging Steve Gibson: somebody reinvented your dog silencer[1][2]! [1] https://www.grc.com/tqc/TheQuietCanine.htm [2] https://groups.google.com/forum/#!topic/portable-sound-b…

I think nearly every budding ee has built a variation of this at some point.

Re: The LM383 Story

#65

Post by voltagex_ »

aidos wrote: post #63
voltagex_ wrote: post #54

Earlier quoted context omitted.

I wish I had half a million bucks to dump into Snapclient - it's so close to being good, but needs some automated way to get the multi-speaker delay down to a good level. In regards to your project - it depends how many sub-projects you want to spawn. I've got https://www.ebay.com.au/sch/i.html?_from=R40&_trksid=m570.l1... hooked up to my PC and some old speakers - 3.5mm jack, USB DAC and Bluetooth support. It's vari…

Do you remember what you ran into with the multi-speaker delay? I managed to get it all working pretty nicely on my 2 speaker test.

I don't remember, but one client was wired and once client was wireless and I couldn't get it working.

I've heard AirPlay "just works" but have never tried it.

Re: The LM383 Story

#66

Post by neuralRiot »

CamperBob2 wrote: post #41
phkahler wrote: post #34

Load dump is not about connecting two batteries in series to achieve 24V. It's about (accidentally?) disconnecting the battery while charging from the alternator - which is an inductive source. When the load taking the current is disconnected that current is going to continue flowing through the vehicle electrical system which will cause a voltage spike until the current goes down. On a related note, I heard this 2nd…

Yes, that was a weird mistake for someone in the author's position to make. That said, I may not understand what a 'load dump' condition is, myself -- I always thought it referred to the common case where a high current load is switched off abruptly, causing the voltage to spike until the alternator's regulator circuit can respond by reducing the field coil current. Disconnecting the battery would not be expected to…

In old cars it was a quick test to see if the alternator was working so some people still think that this is a good idea, IT IS NOT! newer alternators are controlled via LIN bus by the BCM so to generate more current when needed not just using battery voltage as a reference, if you disconnect the battery the voltage can go up to 30v even a bad battery or one with very low charge can make the charging system either shut off or go nuts.
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