DIY motorized LPL44

oyvind · Post by **oyvind** » Mon Sep 08, 2008 6:40 pm

Thanks for a great forum!

After some years without a killer car audio I'm now building with my old parts again.

It's going to be a challenge because I'm in a wheelchair. A have lots of friends to help me with the build, but, I still want to operate the car audio by myself. The sound source will be my laptop, but I also want to boost my bass with the lpl44. I love that thingy!

My plan is to buy a motorized 50.0k ohm potentiometer (is the value still 50.0k ohm when controlling a AX 204A crossover?). The pot will be controlled by an IR receiver with relays. I have a programmable IR sender on my wheelchair.

Is there anything I have to take in considerations regarding the potentiometer? What can I not use? Is the RJ11 wiring order black, red, green, yellow if you are viewing it from the top with the prong facing up?

Where is the best place to look for parts?

Post by **stipud** » Mon Sep 08, 2008 7:17 pm

Hey Oyvind, welcome to the forum.

I love your idea of a 50kohm motorized pot! Unfortunately I have no idea where you would get one.

Here is the pin-out: http://download.phoenixphorum.com/TechS ... L_Info.pdf

nico boom · Post by **nico boom** » Mon Sep 08, 2008 9:28 pm

WELCOME

And good luck with your install!!!
Maybe this will help;
http://www.thel-audioworld.de/bauteile/regler/Potis.htm

bretti_kivi · Post by **bretti_kivi** » Mon Sep 08, 2008 10:27 pm

so, stupid tech question: what does the LPL44 actually do?
It attenuates the gain set on the amp? or something else?

and Hello Oyvind from another northern-european newbie

Post by **fuzzysnuggleduck** » Tue Sep 09, 2008 1:32 am

bretti_kivi wrote:so, stupid tech question: what does the LPL44 actually do?
It attenuates the gain set on the amp? or something else?

and Hello Oyvind from another northern-european newbie

Bingo. It attenuates the gain.

bretti_kivi · Post by **bretti_kivi** » Tue Sep 09, 2008 2:33 am

so when adding an LP44, I'm adding another connector and pot to the gain circuit... so quality would be good.

thanks for the link, that's really cool. €100 for a motorised pot is kinda steep, though!

Bret

Post by **stipud** » Tue Sep 09, 2008 6:26 am

The THEL components are really really nice. Nico has a very nice preamp constructed from their parts.

I don't think you really need audiophile grade pots for an LPL though, since it is not in the acoustic circuit.

nico boom · Post by **nico boom** » Tue Sep 09, 2008 9:53 am

stipud wrote:The THEL components are really really nice. Nico has a very nice preamp constructed from their parts.

I don't think you really need audiophile grade pots for an LPL though, since it is not in the acoustic circuit.

You're right about that Tom!
I realized that later... yet motorized pots can be found in a lot of old cd players and such; only have to find the right value...

oyvind · Post by **oyvind** » Tue Sep 09, 2008 5:01 pm

Thanx for all the feedback!

Found this motorized pot:

http://cgi.ebay.ie/ws/eBayISAPI.dll?Vie ... 0261846243

And this IR controller kit from the same seller:

http://cgi.ebay.ie/ws/eBayISAPI.dll?Vie ... 0281281386

Total price is under €100! Can I go for that pot?

I guess you want pictures from the build?

oyvind · Post by **oyvind** » Tue Sep 09, 2008 5:03 pm

By the way. Can I use the RJ11 6P4C plug, or is it to wide?

MrMusashi · Post by **MrMusashi** » Wed Sep 24, 2008 1:16 pm

standard 4 pin telephone plug should do it

MrM

ps: ive looked at the manual you sent me and it should be no problem to use the 1 second impulse variation. just feed the motor in the pot with a lower voltage and it should turn slower....

KHPower · Post by **KHPower** » Mon Sep 29, 2008 11:37 pm

Motorized? Thats off the chain! Especially if you could use the the factory steering remote control interface on some cars for the after market head unit to adjust the control

KHPower · Post by **KHPower** » Mon Sep 29, 2008 11:39 pm

Or you could just buy a old junk Aiwa or other home stereo where the volume conrtol was motorized and use that , maybe

Post by **Bfowler** » Tue Sep 30, 2008 7:43 am

^dude, thats actually a REALLY good idea...

KHPower · Post by **KHPower** » Tue Sep 30, 2008 8:44 am

Bfowler wrote:^dude, thats actually a REALLY good idea...

i got a aiwa sitting close to the becnh as we speak that I could use and then i think when aiwas were the hizzy I had about every friend I know buy one and they still have them laying around.

DIY motorized LPL44

DIY motorized LPL44

What about this pot?

RJ11 6P4C