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lights for tfm

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Scarabeo

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SILVER-7 TUBE AMP

Posts: 2658

Joined: Tue Nov 18, 2008 6:05 pm

Post Fri Oct 21, 2011 4:42 pm

Re: lights for tfm

TNRabbit wrote:How to post pictures on this forum--

There are two ways:

1. Start your post, then click on the "Upload Attachment" tab at the bottom, then follow directions

2. Post your pics to a web photo host, such as Photobucket, Flickr, etc., then copy the link & paste into the body of your post, then highlight the link & click on the Img button above (between [*] & URL buttons).

I just did both ways you recommended to show how they come out!

Image Direct link from Imageshack.com is here with Img box above.

Attachment is below V
Attachments
meter 001.JPG
BillD, You will be forever with us! RIP until we meet again on the other side...
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mbskeam

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SILVER-7t

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Location: Woodinville Wa

Post Fri Oct 21, 2011 5:37 pm

Re: lights for tfm

Mbskeam


#1 BLACK BEAUTY's made by the man, the myth, the legend Bob Carver
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The only thing I'll feel......will be the RECOIL
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"We should seek the greatest value of our action"
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WhackJob

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M-400t CUBE

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Location: Canada

Post Fri Oct 21, 2011 7:18 pm

Re: lights for tfm

Yeah - I'm dumb...

Anyway..added blue LEDs to a TFM-35X recently, 960 ohm resistors and a bit of 'ingenuity'
Attachments
InRack.jpg
InRack.jpg (52.95 KiB) Viewed 768 times
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Mr. M-500t

(pair of) SILVER-7 TUBE AMPs

Posts: 6211

Joined: Fri Mar 17, 2006 10:00 pm

Post Sun Oct 23, 2011 9:47 am

Re: lights for tfm

Looking good, Whackjob ! =D> =D> =D>
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kingman

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(pair of) SILVER-7 TUBE AMPs

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Post Sun Oct 23, 2011 10:17 am

Re: lights for tfm

Kool!!!! 8)
In reality, it only matters what it sounds like to YOU!!!
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tfmman

Newbie

Posts: 11

Joined: Thu Oct 20, 2011 12:17 pm

Post Tue Nov 08, 2011 11:33 pm

Re: lights for tfm

WHy do I need a resistor? what will happen if I don't use a resietor? tnx
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Scarabeo

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SILVER-7 TUBE AMP

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Joined: Tue Nov 18, 2008 6:05 pm

Post Wed Nov 09, 2011 4:20 am

Re: lights for tfm

tfmman wrote:WHy do I need a resistor? what will happen if I don't use a resietor? tnx

Because if you don't add a Resister you will not be able to resist doing this LED shit on everything!!! :lol: :lol: :lol:
Ok someone will post the "ACTUAL ANSWER" but I could not resist....
BillD, You will be forever with us! RIP until we meet again on the other side...
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TNRabbit

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Post Wed Nov 09, 2011 6:53 am

Re: lights for tfm

tfmman wrote:WHy do I need a resistor? what will happen if I don't use a resietor? tnx


You'll burn up the LED & possibly fry your circuit. LEDs are usually about 3.2-3.5 volts & that's a 12-volt circuit. They are also extremely low resistance & present a difficult load to the circuit.

The resistor dops everything dowm to a more manageable level. The value of the resistor needed depends on the circuit & the LED(s).
TNRabbit
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tfmman

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Joined: Thu Oct 20, 2011 12:17 pm

Post Wed Nov 09, 2011 9:55 am

Re: lights for tfm

I purchesed 12 volt leds for a car so they should work without a resistor is that coorect? tnx
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BillD

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Post Wed Nov 09, 2011 10:05 am

Re: lights for tfm

If the voltage is 12V, they should work, yes.

Calculating the value of the current limiting resistor is a simple application of Ohms law. An LED is a current driven device, which means its brightness varies by how much current is passing through it. However, too much voltage will "push" too much current through the device, and a resistor is used to lower this "pressure".

Image

The two specs you need from the LED are it operating voltage (drop) and its current requirement, which are usually easy to find on the spec sheet.
It should sound like it isn't there!
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Making life enjoyable through expensive electronics.
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tfmman

Newbie

Posts: 11

Joined: Thu Oct 20, 2011 12:17 pm

Post Wed Nov 09, 2011 10:27 am

Re: lights for tfm

K tnx I just double checked ny leds the specs say they have the risistor on them for 9 to 12 volts souldered inline so I checked one and they do have a resistor inline on the wire. tnx
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fixj

Newbie 50+

Posts: 54

Joined: Sat Jul 09, 2011 1:07 am

Post Sun Nov 13, 2011 1:09 pm

Re: lights for tfm

have two TFM amps without lights.....both meters went at the same time,, is that usual? or is my problem something other than bulbs?
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mbskeam

User avatar

SILVER-7t

Posts: 1991

Joined: Mon Jan 25, 2010 2:32 am

Location: Woodinville Wa

Post Sun Nov 13, 2011 2:00 pm

Re: lights for tfm

pop the top, check the voltage at the light board plug
Mbskeam


#1 BLACK BEAUTY's made by the man, the myth, the legend Bob Carver
CARVER: TFM-75, TFM-45(3), SD/A-490T
SUNFIRE: Tube pre
2 sets of ALS'3, set of SILVERS, set of PLATS
AUDIOCONTROL: phase coupled activator
KENWOOD: BASIC M2a (2)

“Youth ages, immaturity is outgrown, ignorance can be educated, and drunkenness sobered, but stupid lasts forever.”
― Aristophanes

The only thing I'll feel......will be the RECOIL
Necronomicon Ex-Mortis....... Klaatu Barada Nikkto
"We should seek the greatest value of our action"
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