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Subject Author Date
What value pot? ---MIKE--- 05-03-2008
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Posted by ---MIKE--- on May 3, 2008, 1:00 pm
My new digital FM tuner puts out too strong a signal compared to my
other inputs (TV and CD). I want to install a dual potentiometer
between the tuner and preamp to reduce the volume. What is the best
value pot to use for this. I have ordered 50K, 100K, 250K and 500K from
Mouser (the pots are cheap - the shipping is not).


---MIKE---
>>In the White Mountains of New Hampshire
>> (44=B0 15' N - Elevation 1580')


Posted by Mark Lloyd on May 3, 2008, 4:03 pm
On Sat, 3 May 2008 13:00:52 -0400, twinmountain@webtv.net (---MIKE---)
wrote:

>My new digital FM tuner puts out too strong a signal compared to my
>other inputs (TV and CD). I want to install a dual potentiometer
>between the tuner and preamp to reduce the volume. What is the best
>value pot to use for this. I have ordered 50K, 100K, 250K and 500K from
>Mouser (the pots are cheap - the shipping is not).
>

IIRC, 50K should work OK.

>
> ---MIKE---
>>>In the White Mountains of New Hampshire
> >> (44° 15' N - Elevation 1580')
--
Mark Lloyd
http://notstupid.laughingsquid.com

"So far as I can remember, there is not one word
in the Gospels in praise of intelligence."
--Bertrand Russell

Posted by HeyBub on May 3, 2008, 4:34 pm
---MIKE--- wrote:
> My new digital FM tuner puts out too strong a signal compared to my
> other inputs (TV and CD). I want to install a dual potentiometer
> between the tuner and preamp to reduce the volume. What is the best
> value pot to use for this. I have ordered 50K, 100K, 250K and 500K
> from Mouser (the pots are cheap - the shipping is not).
>

Hint: If there are three terminals that connect to the innards of the pot,
short two adjacent ones together (center and either side).

This prevents a full open circuit when the wiper inside makes a poor contact
or hits a bump.



Posted by Jeff Wisnia on May 3, 2008, 5:42 pm
HeyBub wrote:

> ---MIKE--- wrote:
>
>>My new digital FM tuner puts out too strong a signal compared to my
>>other inputs (TV and CD). I want to install a dual potentiometer
>>between the tuner and preamp to reduce the volume. What is the best
>>value pot to use for this. I have ordered 50K, 100K, 250K and 500K
>>from Mouser (the pots are cheap - the shipping is not).
>>
>
>
> Hint: If there are three terminals that connect to the innards of the pot,
> short two adjacent ones together (center and either side).
>
> This prevents a full open circuit when the wiper inside makes a poor contact
> or hits a bump.
>
>

That would only work if he puts the pots in SERIES with the signals and
inputs.

I think he's more likely to use them as potentiometers, in which case
your offering won't work.

Peace,

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.98*10^14 fathoms per fortnight.

Posted by Mark Lloyd on May 3, 2008, 6:03 pm
wrote:

>---MIKE--- wrote:
>> My new digital FM tuner puts out too strong a signal compared to my
>> other inputs (TV and CD). I want to install a dual potentiometer
>> between the tuner and preamp to reduce the volume. What is the best
>> value pot to use for this. I have ordered 50K, 100K, 250K and 500K
>> from Mouser (the pots are cheap - the shipping is not).
>>
>
>Hint: If there are three terminals that connect to the innards of the pot,
>short two adjacent ones together (center and either side).
>
>This prevents a full open circuit when the wiper inside makes a poor contact
>or hits a bump.
>

I've seen a lot of audio wiring diagrams, and that's not the way it's
done. IIRC you connect the fixed resistor across the source and the
wiper of the pot to the load. The source never has less than 50 ohms
across it.
--
Mark Lloyd
http://notstupid.laughingsquid.com

"So far as I can remember, there is not one word
in the Gospels in praise of intelligence."
--Bertrand Russell

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