MIMF

A coil does not act like an antenna but it will pickup some EM field radiation, but in an entirely different manor to an antenna. However, the signal that is picked up is not common mode. As I said, if the amplifier is close to the coil (you mentioned in the pickup with the coil), then the common m...

However, in our world, low-z usually means low H and low C which moves or removes any resonant in the response leading to a sound quality many players do not like. Again agreed. The point here is that you want to regain control over the resonant frequency (e.g. using state-variable filters, or in m...

Some comments in no particular order... If you are matching resistors, the tolerance (1%, 0.1% etc) is not relevant other than making your matching task easier. You should pick a resistor for it's noise generation characteristics (thermal noise, boltzmann etc) and then match. Agreed. I keep resista...

Charlie Schultz wrote:Joel, just a reminder that we don't allow discussions that draw content to other sites, commercial or otherwise (rules 1c, 1d).

OK, understood. I'm sorry for violating your rules.

I know you've said that you're using the opamp in floating differential mode for low noise, and that may be adequate, but you would get even better signal to noise ratio if you used a true balanced system, ie a humbucker. Food for thought anyway. Thanks, Greg. To be honest, I've been pondering on t...

I know you've said that you're using the opamp in floating differential mode for low noise, and that may be adequate, but you would get even better signal to noise ratio if you used a true balanced system, ie a humbucker. Food for thought anyway. Thanks, Greg. To be honest, I've been pondering on t...

Agreed. I am working on this incrementally and this is just a step in the development. I just wanted to have a quick 'taste' of the pickup's sound compared to pickups I know. I do have the lo-Z driver-coil test setup and I am starting to measure the response of the coil+differential amp using a sin...

Ok, had another look at the blog. Still, with only a single plucked note, it doesn't really tell us anything about bandwidth. With a large "plucked" sample group to account for the problems of consistency of plucking, and averaged results, we could gather data on comparitive bandwidth, bu...

Mark Swanson wrote:So, what does the graph show us? And please show the graph we are supposed to compare it to.

Mark, please see the second link in the post http://www.cycfi.com/2013/04/frequency-analysis/.

Let it breathe (part 2): More Frequency Analysis Last time we did some (very rough) preliminary tests comparing an early version of the hex pickup with a Fender Stratocaster and a Gibson Les Paul . The initial test was done using a 2000 turns AWG 42 coil and the cheapo TL072 Op Amp in differential ...

Thank you, Greg! Hi Joel, interesting stuff. If I'm reading right, you don't have differential coils, only a differential output amplifier for each coil, correct? You might find it worth it to try differential coils like a humbucker (either in traditional humbucker side-by-side arrangement, or as st...

Non-traditional guitar designs are my obsession. I designed and built the Carbon-Fiber-Bamboo guitar. Currently, I use DiMarzio Injector pickups. On my next iteration of the prototype, I am experimenting on hexaphonic pickups for hex processing. http://www.cycfi.com/wp-content/uploads/2013/03/Isomet...