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2 ten ohm resisters and button Mic element

 

Hi, my microBITX came with two ten ohm resisters in the package and what looks like a microphone cartridge.? Nothing in the plans or diagrams for them.?
Wondering if anyone can advise re: installation.? Thanks Jeff
 

I think those '10 ohm resistors' are more like 10 K.? They are for a paddle type of key.? The one with seperate contacts for the dot and dash.? The resistors go from the ground wire to each side of the paddle contacts when using it for CW.

It is a microphone element.? Wire it up to the mic input jack if you want to.? There is a push button for it also.? You do have to provide a holder and cable to use that mic and switch.



On Fri, Aug 10, 2018 at 9:04 AM, jfein2000 via Groups.Io <jfein2000@...> wrote:
Hi, my microBITX came with two ten ohm resisters in the package and what looks like a microphone cartridge.? Nothing in the plans or diagrams for them.?
Wondering if anyone can advise re: installation.? Thanks Jeff
_._,_._,_
 

Thanks Ralph was pretty sure about the mike and button switch. The resistors are brown brown black brown colour code.? Unless I am mistaken that's ten ohms.? Much appreciate the prompt assistance.

cheers Jeff
 

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Brown is 1 black is 0, brown black brown is 100 ohms. 10 ohms is brown black black. Check it with an ohm meter.

On 8/10/2018 8:27 PM, jfein2000 via Groups.Io wrote:

Thanks Ralph was pretty sure about the mike and button switch. The resistors are brown brown black brown colour code.? Unless I am mistaken that's ten ohms.? Much appreciate the prompt assistance.

cheers Jeff


[email protected]
 

Some of the resistors that came with mine seem to have incorrect colour codes. Coded as 10 ohms but measured as 10k as required for example
Gordon Gibby
 

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Three codes for value, Last code is multiplier.
Different.?


On Aug 10, 2018, at 20:55, "john.allan4@..." <john.allan4@...> wrote:

Some of the resistors that came with mine seem to have incorrect colour codes. Coded as 10 ohms but measured as 10k as required for example

Konrad Kristensen
 

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The rule is: Always check resistors and capacitors (with a meter) before you touch them with a hot soldering iron ! ALWAYS!


On Aug 10, 2018, at 8:55 PM, john.allan4@... wrote:

Some of the resistors that came with mine seem to have incorrect colour codes. Coded as 10 ohms but measured as 10k as required for example

Gordon Gibby
 

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On Aug 10, 2018, at 20:59, Konrad Kristensen <konrad.kristensen@...> wrote:

The rule is: Always check resistors and capacitors (with a meter) before you touch them with a hot soldering iron ! ALWAYS!


On Aug 10, 2018, at 8:55 PM, john.allan4@... wrote:

Some of the resistors that came with mine seem to have incorrect colour codes. Coded as 10 ohms but measured as 10k as required for example

[email protected]
 

Well that makes sense. I have been out of the hobby for 25 years. It is strange that the resistors are 5% so I assume they are E24 series, but that series only has 2 significant digits in the possible values so the extra colour band does not seem to add value.
Thanks, I am learning something every day.
 

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This should help. I use it in my BME301 class.

Howard

On 8/10/2018 9:11 PM, john.allan4@... wrote:

Well that makes sense. I have been out of the hobby for 25 years. It is strange that the resistors are 5% so I assume they are E24 series, but that series only has 2 significant digits in the possible values so the extra colour band does not seem to add value.
Thanks, I am learning something every day.


Resistors.pdf
Resistors.pdf

 

I did not check my resistors out,just going by what I had read for the values.? Now that Howard sent that chart , it makes sense. they are using an extra band or standard.? I would not have thought of that either.? Been building and repairing things on a hobby scale for around 50 years.? But mostly US parts.? Just never ran across resistors like that either. Or if I had, never looked at the color code.

I just verified mine and they are a nominal 10,000 ohms with colors like yours.? I did put one under my microscope I use for SMD work and looks to be brown, black, black ,red, gold.

73 de ku4pt




On Fri, Aug 10, 2018 at 8:27 PM, jfein2000 via Groups.Io <jfein2000@...> wrote:
Thanks Ralph was pretty sure about the mike and button switch. The resistors are brown brown black brown colour code.? Unless I am mistaken that's ten ohms.? Much appreciate the prompt assistance.

cheers Jeff
_._,_._,_
Ian Reeve
 

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Please be mindful that there are resistor codes with three bands plus a forth for tolerance and four band plus a fifth for tolerance.I always measure them now to check and it is not unusual either to find one wrongly marked or indeed open circuit.Takes a few seconds to check each resistor,well worth the time .

Get

From: [email protected] <[email protected]> on behalf of Ralph Mowery <rmowery42@...>
Sent: Saturday, August 11, 2018 3:58:38 AM
To: [email protected]
Subject: Re: [BITX20] 2 ten ohm resisters and button Mic element
?
I did not check my resistors out,just going by what I had read for the values.? Now that Howard sent that chart , it makes sense. they are using an extra band or standard.? I would not have thought of that either.? Been building and repairing things on a hobby scale for around 50 years.? But mostly US parts.? Just never ran across resistors like that either. Or if I had, never looked at the color code.

I just verified mine and they are a nominal 10,000 ohms with colors like yours.? I did put one under my microscope I use for SMD work and looks to be brown, black, black ,red, gold.

73 de ku4pt




On Fri, Aug 10, 2018 at 8:27 PM, jfein2000 via Groups.Io <jfein2000@...> wrote:
Thanks Ralph was pretty sure about the mike and button switch. The resistors are brown brown black brown colour code.? Unless I am mistaken that's ten ohms.? Much appreciate the prompt assistance.

cheers Jeff

 

Yes you are quite correct sorry.......knew it wasn't 10k but got it wrong.
 

I guess that I will be measuring the resistors instead of just looking at the colors from now own.? I just hate it when 'standards' change, or one countries 'standard' is different from another.

At work we had some large 480 volt 3 phase cabinets.? The master disconnect switch was always red for off, and green for on.? Was that way for 40 years.? Then around 2000 we got in a lot f equipment made over seas.? Seems that they wanted to use red for on meaning it was not safe to open and green for off meaning it is safe to open.? When dealing with 480 volts and over 200 amp circuits we sure do not need that kind of confusion, but have it.








On Sat, Aug 11, 2018 at 2:45 AM, Ian Reeve <ian.radioworkshop@...> wrote:
Please be mindful that there are resistor codes with three bands plus a forth for tolerance and four band plus a fifth for tolerance.I always measure them now to check and it is not unusual either to find one wrongly marked or indeed open circuit.Takes a few seconds to check each resistor,well worth the time .
 

Ok.???? Guess I am a bit long in the too but i grew up with 4 band coding......the last being tolerance.? These resistors are five bands hence the error on my part.? Also the first two bands looked like brown but under a magnifying glass they are not they are red.? The value of the two resistors is 2.2 kohms.? Tested on an old analog Heathkit vom and a modern digital vom both agree.? So I have to assume they are meant to be used with the paddle although they are not 10 kohms.? Thanks for all the comments.? Cheers Jeff

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