Hey!
So I got one of these weird disc things for about $1.
The seller told me that it's a military grade resistor, and it might be one. I used my 20000 count meter on the 20 Ohm range and couldn't get a usable reading as it was close to the resistance of my probe wire and stuff.
There are a few colored dots on it reading black-brown-black-red-gold-yellow(?), but they don't match the resistance of 1 mOhm or something ridiculously low.
I also couldn't get an accurate inductance reading (with a resolution of 100nH), so maybe not an inductor?
It's not a diode either.
There are a few numbers on it but I couldn't find anything.
I have attached the pictures below.
Thanks!
So I got one of these weird disc things for about $1.
The seller told me that it's a military grade resistor, and it might be one. I used my 20000 count meter on the 20 Ohm range and couldn't get a usable reading as it was close to the resistance of my probe wire and stuff.
There are a few colored dots on it reading black-brown-black-red-gold-yellow(?), but they don't match the resistance of 1 mOhm or something ridiculously low.
I also couldn't get an accurate inductance reading (with a resolution of 100nH), so maybe not an inductor?
It's not a diode either.
There are a few numbers on it but I couldn't find anything.
I have attached the pictures below.
Thanks!
My first impression is a feed through cap. Check it as a cap and see. The tabs on the body would be bent down to mount this thing in a hole in a chassis, then the cap part is used to carry a signal through the chassis. Something used in RF, not audio. Of course it could be something totally different too.
COuld conceivably be some sort of semiconductor. Like a varistor or something.
COuld conceivably be some sort of semiconductor. Like a varistor or something.
It might be a feed through cap as it is shorted across the terminals. Unfortunately, I don't have a capacitor tester. Every tester I've ever had have died.
I doubt that it's a semiconductor though.
Hi.
A quick Google search end up to this.
Buy Now 912-2055-000 from Lintech IS09001:AS9120 Trusted Distributor
Rockwell Collins Inc, CAPACITOR,FIXED,MICA DIELECTRIC
A quick Google search end up to this.
Buy Now 912-2055-000 from Lintech IS09001:AS9120 Trusted Distributor
Rockwell Collins Inc, CAPACITOR,FIXED,MICA DIELECTRIC
- Capacitance Value Per Section
1000.000 picofarads single section - Body Style
w/thd bushing mtg, terminals on opposite end - Case Material
metal - Mounting Facility Type And Quantity
1 threaded bushing - Special Features
0.657 in. dia - Terminal Type And Quantity
2 tab, solder lug - Nonderated Continuous Voltage Rating And Type Per Section
1000.0 dc single section - Tolerance Range Per Section
-10.00/+10.00 percent single section - Temp Coefficient Of Capacitance Range Per Section In Ppm Per Deg Celsius
-20.0/+100.0 single section - Schematic Diagram Designator
no common or grounded electrode(s) - Body Length
0.178 inches nominal
This might be the one. I measured it with a ruler and the body length is around 0.17 inches.
Do you think I should try to charge it to 360V and make sure it's a capacitor?
Do you have any friends with a meter that measures caps? Maybe they would measure it for you, or lend you the meter.
Unfortunately, no.
I have an Arduino and I'll try to make a capacitance meter with it and test it with that. Might take a few days, but I'll post the results as soon as they're ready.
I think it is. I tested it with an ultra crude capacitor tester (multimeter in diode test mode connected in series with a 5mm green LED) and it charges up quickly and holds the charge and I can touch the leads and the body to discharge it.
Using the table you just gave, it comes out as a 1nF cap?
Yes, 1nF 1000V is common for this capacitor style. It is mostly useful for radio frequency applications. If it has been stored properly, it is a good capacitor despite the age; they are sold at 0.50 - 1 euro each at hamfests. It is not very practical in a audio circuit. Maybe it can be used on the output tube anode, on some amplifiers.
The seller had 50 of them in sealed foam packaging in an acrylic cover. I might get a few for a bit cheaper for use in maybe timing circuits and for decoupling.
Mica caps are pretty stable (not as NP0, but they have higher voltage ratings).