Search found 31 matches

by Veronica Merryfield
Mon Jan 27, 2020 12:49 pm
Forum: Solid-Body and Chambered or Semi-Solid Electric Guitars and Bass Guitars
Topic: CE marking for electric guitar
Replies: 6
Views: 4155

Re: CE marking for electric guitar

CE marking is applicable within the EEA. The EEA links the EU member states and three European Free Trade Association (EFTA) states. The legislation requires that products are safe but does not mandate marking. This is a good intro and has a table of applicable standards one can look up - http://www...
by Veronica Merryfield
Mon Jan 27, 2020 12:00 pm
Forum: Electronics
Topic: Low Impedance pickup - prototype
Replies: 20
Views: 13312

Re: Low Impedance pickup - prototype

If you a looking for a low impedance pickup that is magnetic but small, might I suggest you look at variable reluctance gear teeth sensors. The downside is the price and size in that one must place them close to the bridge such that the string excursion stays within the sensing range. The plus side ...
by Veronica Merryfield
Tue Jan 21, 2020 5:16 pm
Forum: Electronics
Topic: Low Impedance pickup - prototype
Replies: 20
Views: 13312

Re: Low Impedance pickup - prototype

These current transformer based pickups always sound more trebly and less bassy. There is going to be a d/dt limitation at the bass end of the spectrum anyway but with an increased high end it simply sounds less bassy, but they do give a very clean output. The tonal aspects can be manipulated with p...
by Veronica Merryfield
Tue Jan 21, 2020 4:54 pm
Forum: Electronics
Topic: What makes a pickup hot?
Replies: 7
Views: 4162

Re: What makes a pickup hot?

Pickups are an interesting can of worms :) To answer the question, a hotter pickup is one that has a higher output voltage. What makes this happen is either a strong magnetic field hence a great induction of voltage in the coil, and/or more turns on the coil. However, there is no panacea and there i...
by Veronica Merryfield
Thu May 30, 2013 10:18 pm
Forum: Electronics
Topic: Hexaphonic Pickup Project
Replies: 21
Views: 19013

Re: Hexaphonic Pickup Project

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 mo...
by Veronica Merryfield
Thu May 16, 2013 4:02 am
Forum: Electronics
Topic: Hexaphonic Pickup Project
Replies: 21
Views: 19013

Re: Hexaphonic Pickup Project

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. Differential input ampl...
by Veronica Merryfield
Sun Apr 14, 2013 10:49 pm
Forum: Electronics
Topic: toasted solid state, is this beyond repair?
Replies: 16
Views: 11037

Re: toasted solid state, is this beyond repair?

I think the lower rating will be ok until there is no load connected, so best use the high rating. I also noticed that the output transistors and those 0.33 5W resistor are only just about ok rating wise for the rated output power but it would be possible to drive the output hard enough to fry them....
by Veronica Merryfield
Sun Apr 14, 2013 1:19 pm
Forum: Electronics
Topic: toasted solid state, is this beyond repair?
Replies: 16
Views: 11037

Re: toasted solid state, is this beyond repair?

Probably not. These were right out of towers and I didn't look further. It would depend on how it is used. Although some amps do power the driver stages from the main rail, not all do. I'd need to look at the schematic to get a better idea.
by Veronica Merryfield
Sat Apr 13, 2013 11:37 pm
Forum: Electronics
Topic: toasted solid state, is this beyond repair?
Replies: 16
Views: 11037

Re: toasted solid state, is this beyond repair?

In the old days, the by word for the books was rather vulgar, but that's another story. For future reference, http://ia700804.us.archive.org/15/items/TowersInternationalTransistorSelector/Towers-TowersInternationalTransistorSelector.pdf is what you need but it is old, so any new transistors won't be...
by Veronica Merryfield
Sat Apr 13, 2013 2:06 am
Forum: Electronics
Topic: toasted solid state, is this beyond repair?
Replies: 16
Views: 11037

Re: toasted solid state, is this beyond repair?

Once the carbon has been removed, I would use a PCB lacquer.

You should be able to infer most of the track layout from the component layout and schematic but it sounds like you won't need to.

Have fun and good luck.
by Veronica Merryfield
Fri Apr 12, 2013 8:08 pm
Forum: Electronics
Topic: toasted solid state, is this beyond repair?
Replies: 16
Views: 11037

Re: toasted solid state, is this beyond repair?

You'll have to start by finding a schematic and a picture. I can't see any part ids on the board silk screen so a schematic alone won't be enough. The pattern of carbon looks like there was a fire followed by an explosion. The heat might well have ruined the copper traces too and possibly made the P...
by Veronica Merryfield
Fri Apr 12, 2013 7:46 pm
Forum: Electronics
Topic: I need help with programming an EPROM chip for signal processor
Replies: 14
Views: 9340

Re: I need help with programming an EPROM chip for signal processor

A fan club :)

As it happens I don't have an eraser or programmer but I know many that do.
by Veronica Merryfield
Thu Apr 12, 2012 2:50 am
Forum: Electronics
Topic: ...all this earthing stuff..
Replies: 8
Views: 4655

Re: ...all this earthing stuff..

I always star connect the earth/ground connections and connect the cavities. In many cases one can get away without the star or the cavity shielding, but it is more likely to bite you than if you take the extra steps.

Production wiring gives some of us work :)
by Veronica Merryfield
Thu Apr 12, 2012 2:42 am
Forum: Electronics
Topic: Looking for suggestions on scatter winding pickups
Replies: 5
Views: 3914

Re: Looking for suggestions on scatter winding pickups

added to which proportionally more of the coil is in a weaker field. Capacitance reduction is the big factor for scatter winding and although hand winding tends to be more scattered for a non-scattered wind than a machine would pickup, there is still a significant difference between a hand tight win...
by Veronica Merryfield
Thu Apr 12, 2012 2:36 am
Forum: Electronics
Topic: Variable reluctance sensor
Replies: 12
Views: 5526

Re: Variable reluctance sensor

27 years ago I fitted 4 of these little sensors to my first bass. They still work just fine. Super high output. I have then about an inch and a half from the bridge to give a very bright output that I then post process to suit. They also tend to have to be close to the string which precludes them be...
by Veronica Merryfield
Thu Mar 22, 2012 1:05 am
Forum: Tools and Jigs
Topic: Free CAD software for Windows 7?
Replies: 12
Views: 11626

Re: Free CAD software for Windows 7?

Jon, install VirtualBox and then use an older OS as the guest OS and run TC LE.
by Veronica Merryfield
Tue Jan 10, 2012 1:55 am
Forum: Tools and Jigs
Topic: Tools for building a solidbody electric?
Replies: 14
Views: 10385

Re: Tools for building a solidbody electric?

Milling machine, if you are going to do a bunch - better than a router and router table.
by Veronica Merryfield
Mon Jan 09, 2012 9:30 pm
Forum: Electronics
Topic: pickup winder
Replies: 3
Views: 3774

pickup winder

Posting about a pick up winder 'tool' that needs to go somewhere else - another for the mods.
by Veronica Merryfield
Mon Jan 09, 2012 1:22 am
Forum: The Soundhole
Topic: Mobile apps?
Replies: 7
Views: 7432

Re: Mobile apps?

Admin has to add an access easing script, then the local app interacts with that as though a web browser, sort of.
by Veronica Merryfield
Mon Jan 09, 2012 12:59 am
Forum: Jam Session
Topic: Making a Case Fit the Bass Better
Replies: 8
Views: 6863

Re: Making a Case Fit the Bass Better

Furniture repairer? Upholster?