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Old 15th August 2006, 05:38 PM   #1
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Default My take on the Joshua Tree controller

I am in the process of building an audio controller based on the Twisted Pear Joshua Tree kit. The controller is housed in a chassis similar to my RevC monoblock amps posted elsewhere on this board. The controller functions as a very simple passive attenutator with 2 inputs. I plan on adding infrared remote volume control using Brian Donegan's "Twisted Pot" circuit and design. It's taken a long time to get where I am, but the project is far from complete.

As usual, the enclosure is from Lansing, the RCA's are made by Vampire (Michael Percy Audio), the toroid is from Plitron, the back plate is from Front Panel Express, the selector switch is from Grayhill (71 series that Peter Daniel recommends, available at Digi Key), and the knobs are from the guy in Hong Kong selling knobs on Ebay. Miscellaneous screws are from BoltDepot.com.

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Old 15th August 2006, 05:44 PM   #2
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Here is what I am working on for a circuit to drive a motorized potentiometer. It is essentially Brian Donegan's design.

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The board measures 2" x 3" and will fit right below the input selector switch shaft. Note how the components are kept to the sides of the board to allow for clearance of the shaft.

This is my first use of Eagle to design boards, and a board house to manufacture the two sided board. Hopefully, I got it right.
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Old 23rd August 2006, 12:44 AM   #3
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A little progress... Here's my version of Brian's remote control card. The board is made by Protoexpress and seems to be excellent quality. Now I'm waiting on the proper sized transformer from Plitron.
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Old 23rd August 2006, 01:01 AM   #4
Gooch is offline Gooch  United States
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Very nice work they look good all together. One question why are you using two JT relay boards I thought you only need one for single end?


Regards
Dave
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Old 23rd August 2006, 01:28 AM   #5
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Good question. You are correct. Only 1 JT relay board is needed for SE input. I contemplated balanced inputs at first and ordered 2 relay boards. I kept the two 2 boards to maintain a "dual mono" configuration. Thanks for the feedback.
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Old 3rd September 2006, 08:50 PM   #6
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Default A little progress

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I changed to a 9v Plitron transformer, which seems fine for the project. One secondary powers the JT controller board and the other secondary powers my remote board. I just need to tidy things up, and I think I'm done.
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Old 9th September 2006, 08:37 PM   #7
jleaman is offline jleaman  Belgium
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I don't know how i missed this but SO NICE!!
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Old 10th September 2006, 11:05 PM   #8
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I am mostly done.

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If anyone is interested in my version of the remote board, I have one for sale ($30).

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Old 11th September 2006, 11:36 AM   #9
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I was asked where certain parts for this project come from. The decoder IC is from Rentron, and the case is from Lansing.
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Old 12th September 2006, 10:26 PM   #10
Arius is offline Arius  United States
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Hi,

Very nice casework.

I am a little puzzled, Twisted Pear's website seem to have been de-registered or something so I can't check. So what you have is a pre-amp right? The relay board (Joshua Tree) is a relay-based log attenuator. So why add the IR remote controlled motorized pot? Seems to me like you have 2 volume controls???

Or if the relay board is for input selection, that's an awful lot of relays for 2 input channels.
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