Search found 74 matches

by Halgeir Wold
Tue Oct 29, 2019 5:21 pm
Forum: Tools and Jigs
Topic: Makers Knife
Replies: 10
Views: 7775

Re: Makers Knife

Mora of Sweden makes a series of woodworkers knives...
This is their official US agent.... https://www.industrialrev.com/morakniv
by Halgeir Wold
Tue Jul 23, 2019 5:47 pm
Forum: Electronics
Topic: Magnetic fields
Replies: 4
Views: 2905

Re: Magnetic fields

In RF circuits, ferrous coil cores will increase inductance, while aluminium or brass will lower the unductance somewhat... I've used this effect sometimes in radio circuits.. No real idea what it will do in a PUP......
by Halgeir Wold
Mon Jul 01, 2019 3:42 pm
Forum: Electronics
Topic: Soldering iron temperature for guitar, amp and effects circuits
Replies: 12
Views: 5035

Re: Soldering iron temperature for guitar, amp and effects circuits

I think Hakko is OK, as far as I know. I've been using various Wellers for over 40 yrs, and have at least 4 versions, so personally I stick with those. Weller also has some controlled stations which are more directed towards the hobby market, and should probably cost around 100-150 USD, as opposed t...
by Halgeir Wold
Sat Jun 29, 2019 5:16 pm
Forum: Electronics
Topic: Soldering iron temperature for guitar, amp and effects circuits
Replies: 12
Views: 5035

Re: Soldering iron temperature for guitar, amp and effects circuits

I use 350-370C for most things.. slightly lower setting for ICs and small transistors, and small components... for larger parts, connectors etc 370-400. A 40W iron is kind of smallish for larger stuff. When you have temp control, buy the larger iron you feel you can afford. I use 80W Wellers, both a...
by Halgeir Wold
Thu Jun 20, 2019 5:10 pm
Forum: Tools and Jigs
Topic: Sandpaper adhesive
Replies: 12
Views: 3310

Re: Sandpaper adhesive

Double sided carpet tape....
by Halgeir Wold
Tue Apr 09, 2019 12:17 pm
Forum: Tools and Jigs
Topic: Dust-mageddon!! Dust bag attachment help needed
Replies: 36
Views: 8189

Re: Dust-mageddon!! Dust bag attachment help needed

Well, - you guys in particular should know that a crapton is 2000 lbs, whereas a shitton - or shytetonne for those who prefer - is 2240 lbs or 1000kg.... :lol:
by Halgeir Wold
Sun Mar 31, 2019 5:01 pm
Forum: Electronics
Topic: Piezo Bass Preamp
Replies: 30
Views: 12093

Re: Piezo Bass Preamp

Piezos in general want high impedance loads, and most piezo mic's solve this problem by using a FET transistor as an impedance converter. This might be one solution to the load problem. Another way is to use opamps in non-inverting mode, where you will benefit from the JFET or other high-Z input opa...
by Halgeir Wold
Tue Mar 05, 2019 4:31 pm
Forum: Jam Session
Topic: Building a kit with my son
Replies: 13
Views: 6269

Re: Building a kit with my son

My son wants a Telecaster, and I've been looking at the StewMac kits, - particularly now as they are all on sale.....
Tuners, mic's and stuff are easy to replace, but what is the quality of these kits, - particularly woods and neck accuracy... ?
by Halgeir Wold
Mon Feb 25, 2019 5:33 pm
Forum: Tools and Jigs
Topic: Coolest or most useful tool that you have?
Replies: 60
Views: 37109

Re: Coolest or most useful tool that you have?

Steve - what you really need for using Arduino with the saw, is a linear encoder - a pulse counting ruler thingie that's quite easy to interface...
by Halgeir Wold
Tue Jan 22, 2019 6:43 pm
Forum: Electronics
Topic: Just for the fun of it - DIY tube amp
Replies: 11
Views: 6779

Re: Just for the fun of it - DIY tube amp

Of course it depends on the transformers, - and several other parameters, but the numbers I referred to are a sort of average for several HiFi-amps, and to some extent moderately driven guitar amps.... things can always be pushed, but not without a cost..
by Halgeir Wold
Mon Jan 21, 2019 7:01 pm
Forum: Electronics
Topic: Just for the fun of it - DIY tube amp
Replies: 11
Views: 6779

Re: Just for the fun of it - DIY tube amp

A pair of EL84s usually gives 15-18W in HiFi-amps, 6V6 typically aorund 30, 6L6 35-50 depending on type, - the old metal jacket appx 30-35... There are several designs out there... I'm currently working on a 2x6L6 that's supposed to deliver aorund a 100, but I'm holding it back a bit and going for a...
by Halgeir Wold
Mon Jun 25, 2018 12:44 pm
Forum: Other Stringed Instruments
Topic: Banjo saddle moving
Replies: 5
Views: 4720

Re: Banjo saddle moving

The movement is lengthwise.. I have no experience with banjos - is there a way to tell if the "drum skin" is not tight enough , or how does one determine enough tension? ( - I was thinking about just fixing the bridge with a small strip of double sided tape... ;) )
by Halgeir Wold
Sun Jun 24, 2018 6:00 pm
Forum: Other Stringed Instruments
Topic: Banjo saddle moving
Replies: 5
Views: 4720

Banjo saddle moving

A friend of mine has a 6-str banjo where the saddle seems to be moving, constantly throwing the thing out of tune... is it common at all to glue the saddle to the resonator top, or is there another solution??
by Halgeir Wold
Sat Mar 17, 2018 5:08 am
Forum: Electronics
Topic: Where is silver solder used, good ,bad?
Replies: 17
Views: 13448

Re: Where is silver solder used, good ,bad?

Possibly because the lead-free motion that hit us.. :) I sure can understand the environmental aspect of it, on an industrial scale,but for our small scale use for hand soldering, it causes more problems than it saves.. just my 10c.....
by Halgeir Wold
Fri Mar 09, 2018 2:14 pm
Forum: Electronics
Topic: Soldering Iron Recommendations
Replies: 6
Views: 6514

Re: Soldering Iron Recommendations

Weller TCP tips only fits TCP irons... TCP irons are controlled by a Curie magnet at the back of the tip, - regular controlled irons have a sensor that sits against the rear end of the tip..
BTW - I was assuming you have an old TCP iron - there are other tips to get with other temperatures..
by Halgeir Wold
Tue Feb 27, 2018 3:03 pm
Forum: Electronics
Topic: Where is silver solder used, good ,bad?
Replies: 17
Views: 13448

Re: Where is silver solder used, good ,bad?

I think there is ome confusion here.... silver solder for brazing and silver solder for electronics is not the same thing. For electronics the use of silver as additive is mainly based on the newer specs for ROHS and lead free soldering. There is also this strange notion in HiFi circles that silver ...
by Halgeir Wold
Thu Jan 11, 2018 5:16 pm
Forum: Electronics
Topic: Need assistance outlining earphone speaker circuit
Replies: 10
Views: 11739

Re: Need assistance outlining earphone speaker circuit

If you google "Headphone amplifier kit" you will find plenty of kits- some with suitable boxes included or as options, but first you need to set some specifications for your needs. What is you intended use, and what will be your input sources? Headphones come in a variety of impedances, from 8 ohm t...
by Halgeir Wold
Fri Dec 15, 2017 4:42 pm
Forum: Tools and Jigs
Topic: Ikea in guitarbuilding? Thinking of making a Breim/Vuku spraybooth
Replies: 10
Views: 6970

Re: Ikea in guitarbuilding? Thinking of making a Breim/Vuku spraybooth

Unfortunately Ikea has discontinued those massive beech countertops that were perfect for workbenches..... There are some 38mm - presumably oak...
by Halgeir Wold
Thu Nov 02, 2017 3:02 pm
Forum: Electronics
Topic: Solderless wire connectors fortestingpickupwinds
Replies: 3
Views: 4749

Re: Solderless wire connectors fortestingpickupwinds

These should do... must be available from most US electric suppliers... maybe even your local electrician..

http://www.wago.us/products/terminal-bl ... /overview/
by Halgeir Wold
Fri Feb 10, 2017 4:41 pm
Forum: Electronics
Topic: Can someone walk me through speaker design? I have no idea.
Replies: 9
Views: 6318

Re: Can someone walk me through speaker design? I have no idea.

One of the problems in speaker design, is that you can make almost all the wrongs there are, but unless you make a dead electrical short there will always be sound. If it sounds good is another story. MDF is commonly used in most commercial designs from cheap to very expensive, although some audioph...