Need help determining Ohm value of resistor.

[ToddB66]

Hi All !

What is the ohm value for resistor color bands (L-R) orange, orange, black, silver ?

I get ( 33 x 1 ) =33 Ohm ± 10% = 29.7--36.3 Ohms

Here's what I based the above on after consulting resistor color band charts and instructions on the internet.


LEGEND:

• “column” refers to the left-to-right columns on a resistor color band chart.
  
• Orange significant figure = 3
  
• Black in the multiplier column is 10° (ten to the power of zero and zero power means to divide, so 10/10 = 1
  
• The 4th band is Silver in the Tolerance column and that is ±10%, or for 33 Ohms would result in an Ohm range of 29.7 to 36.3 Ohms for the subject resistor.
  

Did I interpret and calculate the Ohm value correctly ?


Thanks for replies.


ToddB66

[CAS]

Hi All !

What is the ohm value for resistor color bands (L-R) orange, orange, black, silver ?

ToddB66

33 ohms 10% tolerance

[ToddB66]

33 ohms 10% tolerance

CAS.......Thanks for confirming that my resistor calculation of 33 Ohms, plus or minus 10 percent is correct !

I would also like a response from our master Carl-NC

ToddB66

[Qiaozhi]

Hi ToddB66,

In response to your email (all typed directly into the forum using ALT CODES):

♥ ♦ ♣ ♠ ☼ § % ü à ç

This was done using IE8 on Windows XP.
The Alt key method is unsupported on Linux systems.

[Qiaozhi]

For linux, you need to use CTRL+SHIFT, tap U key, and then type the unicode. For example: CTRL+SHIFT, U, 171 gives: ű
The Alt Code list is different for Linux than for Windows.

Which OS are you using?

[ToddB66]

Thread title: Need help determining Ohm value of resistor

For linux, you need to use CTRL+SHIFT, tap U key, and then type the unicode. For example: CTRL+SHIFT, U, 171 gives: ű
The Alt Code list is different for Linux than for Windows.

Which OS are you using?

Hi Qiaozhio !

My OS is Microsoft Windows 8.1. In addition, it is version 6.3.9600, Name IDEA-PC, Manufacturer LENOVO and model 10094.

Is Linux another OS ?

Thanks,

ToddB66

[Qiaozhi]

Hi Qiaozhio !

My OS is Microsoft Windows 8.1. In addition, it is version 6.3.9600, Name IDEA-PC, Manufacturer LENOVO and model 10094.

Is Linux another OS ?

Thanks,

ToddB66

Yes, Linux is a different OS, but obviously you are a Windoze user.
I do not currently have access to a Windows 8.1 machine, so perhaps someone else would kindly try entering some Alt Codes and report back.

[ToddB66]

Need help determining Ohm value of resistor.

Yes, Linux is a different OS, but obviously you are a Windoze user.
I do not currently have access to a Windows 8.1 machine, so perhaps someone else would kindly try entering some Alt Codes and report back.

Qiaozhi,

Thanks for your above reply!

My Son works for a company as a full-time Webmaster and is helping me to find a solution to the problem I've had with
this website not accepting ALT CODES.

Meanwhile, I can type my posts on Word Pad, which allows the Alt Codes, and then Copy & Paste into the posting window on Geotech. As they say, this is" the long way around the horn.", but works until we find a solution for direct input of Alt Codes from my keyboard into the posting windows at Geotech. BTW, I do make certain that the NmLk key is turned ON at my keyboard, but this still doesn't make it work.

ToddB66

[ToddB66]

Question about testing a diode.

Hi All !

I have a Hamilton Beach "True Air", model 04531GM , Series B2021AT, wall-mount fan/air freshener. This unit is comprised of a fan motor, ON/OFF switch and a LED. The Led appears to be white color and is soldered to a small PCB that has a diode and 33 Ohm resister sitting beside the diode. These components are soldered in place of course.

As a learning project, I would like to test the diode with my DMM, which is a Radio Shack catalog number 22-805 and has a diode setting, as well as the usual other settings.

I have attached a picture of a diode that looks like mine, with the silver band at the negative cathode end.

Is it possible to test this diode with the leads soldered in place, or would I have to desolder one lead ? Naturally, I would not have the power ON (fan plugged into an electrical outlet).

Thanks in advance for your replies.

ToddB66

[Qiaozhi]

My Son works for a company as a full-time Webmaster and is helping me to find a solution to the problem I've had with
this website not accepting ALT CODES.

As you can see from Post #4, the Geotech website does accept ALT-CODES. Which indicates that you either have a Windows 8 problem, or something specific to your computer.

[Qiaozhi]

Is it possible to test this diode with the leads soldered in place, or would I have to desolder one lead ? Naturally, I would not have the power ON (fan plugged into an electrical outlet).

Set your meter to the diode test position, and put the leads across the diode (positive lead on anode, and negative lead on cathode). The reading should be close to 0.7V. Then try the leads the other way round. The reading will be something different (most likely there will be no reading). If in doubt, snip off one lead and retest.

[ToddB66]

Question about testing a diode.

Set your meter to the diode test position, and put the leads across the diode (positive lead on anode, and negative lead on cathode). The reading should be close to 0.7V. Then try the leads the other way round. The reading will be something different (most likely there will be no reading). If in doubt, snip off one lead and retest.

Qiaozhi,

I got a reading of 027 both ways, i.e. with the positive test lead on the anode lead of the diode and with the test leads reversed. There were no decimal points showing on the meter screen. To confirm, I did have the meter set in the diode position and the screen was showing the mv symbol.

Can the 027 reading be converted "close to 0.7V" mathematically ?

I prefer NOT to clip a lead on the diode if possible.

Thanks,
ToddB66

[ToddB66]

As you can see from Post #4, the Geotech website does accept ALT-CODES. Which indicates that you either have a Windows 8 problem, or something specific to your computer.

Qiaozhi,

I think your analysis is probably correct. I'm hoping my Son can find the problem and make the necessary changes/corrections to my computer. Anyway, as mentioned before, I can temporarily use Word Pad to type posts, then Copy/Paste into Geotech posting windows.

Thanks again !

ToddB66

[CAS]

I got a reading of 027 both ways, i.e. with the positive test lead on the anode lead of the diode and with the test leads reversed. There were no decimal points showing on the meter screen. To confirm, I did have the meter set in the diode position and the screen was showing the mv symbol.

Can the 027 reading be converted "close to 0.7V" mathematically ?

I prefer NOT to clip a lead on the diode if possible.

Thanks,
ToddB66

If you got a reading the same both ways, it sounds like either there is a resister in parallel with the diode or the LED you mentioned on the board is in parallel but reversed. You need to look at the tracks on the board and determine what else is connected to the diode.
Some meters do not give an accurate reading in the 'diode' mode. In reality, the diode mode will only give you an indication of whether the diode/transistor is ok. I have had components that read ok but will break down under load so dont take the reading as gospel. The only real test is to read voltages when it is running to determine if they are working as they should.
If you want to practice on components, go buy a mixed bag of resistors, diodes etc and test those. The solder them into basic circuits so you can understand what readings you get when components are not in isolation. If you were in AUS I would post you a collection to play with.

[ToddB66]

Question about testing a diode.

Qiaozhi,

I got a reading of 027 both ways, i.e. with the positive test lead on the anode lead of the diode and with the test leads reversed. There were no decimal points showing on the meter screen. To confirm, I did have the meter set in the diode position and the screen was showing the mv symbol.

Can the 027 reading be converted "close to 0.7V" mathematically ?

I prefer NOT to clip a lead on the diode if possible.

Thanks,
ToddB66

Qiaozhi,

Attached are two pictures showing the inside of my True Air model 04531GM air freshener and the top & bottom of the PCB for the LED, including the 33 Ohm, plus/minus 10 percent resistor and black-colored rectifier diode.
If I uploaded both pictures correctly, you should see the top side and bottom side of the PCB......if not, I'll leave the one shot and try to upload the correct second view. BTW, I plugged the unit into a wall outlet and the LED works, despite our suspicion that the diode might be faulty (since I got the same 027 reading with the meter leads touching the diode leads both ways.