big_boleros

I have considered your conundrum for about 2.5 minutes (it took me a bit longer than otherwise, as I was fabricating a large one) during this short time I've established you don't know your R's from your elbow ;-) Let me explain...the 'R' in your posted 'classic low pass filter' diagram is NOT the 'R' in play wrt a guitar tone control. The 'R' in play wrt a guitar low pass is the DC resistance of the pickup combined with the parallel resistance of the volume pot. Therefore... Pickup DC resistance + parallel resistance of the volume pot (this'll be the 'R' bit) | | tone cap (this'll be the 'C' bit - albeit the resistance of the tone pot effects how much impact the cap has) | | ground. which should now look like something akin to your classic low pass circuit. Scoop 'n Daddy....I have exorcised the demons....this thread is cleeeeeeeaaaaaaan.

The lack of response to the above line of questioning is noteworthy. Perhaps those who use the signature (elsewhere) "Mr DIY Sustainer" haven´t the answers for once?

Big Hmmm with that one. Can you define efficiency here? In the light of FreshFizz's quotes from earlier on in this thread, I've just gone back to read in full - I agree with Wasp's comments...efficiency (certainly where a battery is involved), to most would mean optimum sustain with the least battery current draw - is that your take on efficiency too? If it is, then to claim 'efficiency' wrt driving of all strings must mean you've collected current draw data while conducting your tests? So what kind of current draw are you seeing with you driver coil?

You might want to revisit your sources! If you increase the size of the wire (and shoot for the same DC resistance - I assume you missed that bit), it will increase the inductance of the driver coil, which in turn will impede the higher frequencies into the coil, but it won't slow the alternating EM action down (now that *would* be clever!), there'll just be less EM strength (drive). The resonance of a driver is already *way* above our band of interest so a few extra turns is of no significance to even warranting mentioning it.. IMHO phase correction is a bit of anomoly here too....you sort one frequency, you introduce probs with other frequencies! It may well be that the commercial sustainer companies have decided that the impact of assisting the weakest link, is a one worth living with ....but phase compensation is a bit of a grand term (two caps & two resistors!)- I'd say it's more likely to be basic frequency compensation (tarted up as phase compensation for the patents - smoke & mirrors), but this in turn, introduces phasing problems.

Mr Fizz - tks for the Galaga Mike tut - very clever. Scoop 'n Daddy.

The net is littered with all manner of "How to" tutorials.....the majority of them cover off all the aspects needed to achieve the intended purpose. So, when looking up "Sustainer Tutorial" .....I guess most would expect a similar format, ie... 1. Here's how you make the driver. 2. Here's how you make the circuit. Tutorial ends. Actually isn't that the purpose of an internet tutorial? ie someone else has gone through the nausea & pulled together all the various elements - it's a fair exchange - they get the kudos of saying "Here's how you do it, aren't I clever", & everyone else gets a free ride & feign "yes, you're extremely clever" ...so sure, yep, it's a fair cop - I'm paying nada & therefore can't demand anything, but in this rich internet age where we're all spoilt with the likes of instructables, most would have come to expect the full picture, but I'm now getting a vibe that anyone wanting to build a DIY sustainer, has to interpret the word tutorial as meaning half a tutorial......and then spend a good amount of time arguing the toss which circuit to go with to complete the other half of the equation. Does anyone have some general linkage to his bare bones sustainer amp (no agc) ...??? (I promise to say it's clever) Scoop 'n Daddy.

But - using your analogy - there are tutorials aplenty wrt the drivetrain (driver) ...in fact I'm fingering my CD collection to see which one must die & yield its case for a 'distressed' looking bobbin ...just scant info about the engine to marry it up with....isn't there one that folks can agree on? Who are da' main eggheads wrt sustainer circuits? Surely they can bash a sustainer schem out to marry up with the driver tutorial? It feels like McCartney is still trying to find Lennon here .....goo goo goo jooob.

Just wonderin' if there an agreed decent circuit for a DIY Sustainer out there? Everwhere I look on the net, is littered with those going on about how to make a driver (from things like cut up CD cases & old PVA) ...but what about the circuit? Is there a tutorial that 'completes the circle' so to speak...cos a driver ain't much use without a decent circuit. Scoop 'n Daddy.