I have got charcraft zfoil 100R.
It is pretty good.
What about making 0.22R output resistor with constantan?
Using O.37mm 4.4R per meter, 0.22R for 5cm.
Constantan Wire - 28 SWG | School Science Equipment
It is pretty good.
What about making 0.22R output resistor with constantan?
Using O.37mm 4.4R per meter, 0.22R for 5cm.
Constantan Wire - 28 SWG | School Science Equipment
Hi tamra ...
And then I wonder what you would use a 0.22 ohm resistor for? It is at very low value for an output resistor ...??
Cheers,
Jesper
... Pleased to hear that you appear to like it ;-) ... However, may I suggest that you give it a little time to burn in... ?
And then I wonder what you would use a 0.22 ohm resistor for? It is at very low value for an output resistor ...??
Cheers,
Jesper
Perfect.
I use tons of 0.1 ohm 5W resistors, both as emitter ballast and speaker ground sensing in mixed feedback nets (to lower guitar amp damping to 1 or worse) and use 4 cm of 0.50mm Constantan, at 2.5 ohm per meter
In fact I cut 5 cm of wire, so I can insert ends in PCB holes for direct soldering to pads, and keep hot wire away from PCB
A bonus is that they work as fuses in catastrophic events and are readily visible.
Haven´t bought commercial 5W ceramic resistors for over 20 years.
Attachments
https://www.diyaudio.com/forums/att...nd-resistor-diy-babelfish-m25-2-schematic-png
Hi Jesper, I am beginniner for electronics so not understood
but parallel 0.22R instead of avoided source resistor?
JMFahey,thanks for info.
The problem was I don't have ohm meter for such small resistance.
Good to know constantan wire is easy to fix resistance value.
Nicoch58,
Your resistor looks super.
I will look for that toothed gear.
Hi Jesper, I am beginniner for electronics so not understood
but parallel 0.22R instead of avoided source resistor?
JMFahey,thanks for info.
The problem was I don't have ohm meter for such small resistance.
Good to know constantan wire is easy to fix resistance value.
Nicoch58,
Your resistor looks super.
I will look for that toothed gear.
I made my own, easy peasy, just a 100mA constant current source and measure voltage drop with a standard multimeter, which now becomes a sophisticated 4 wire ohmmeter, but it´s actually NOT NEEDED 🙂
1) I measure 1 meter of wire to get the ohms per meter, then it´s easy to cut a few cm as needed, only precision instrument required is a ruler.
The worst quality one I can get (50 cents at the Dollar Store) has 1% precision (1 mm) on the 10 cm scale 🙂
2) but not even that, you CAN trust the ohms per meter rating specified by the wire seller, and which is usually printed on the wire spool itsef.
... No, I just hadn't seen your schematic so I did not consider that you were thinking about the source resistors. So, no worries ... ;-)
Cheers,
Jesper