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
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
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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.