My take on the Joshua Tree controller

orthoefer · 15th August 2006, 05:38 PM

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.

orthoefer · 15th August 2006, 05:44 PM

Here is what I am working on for a circuit to drive a motorized potentiometer. It is essentially Brian Donegan's design.

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.

orthoefer · 23rd August 2006, 12:44 AM

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.

Gooch · 23rd August 2006, 01:01 AM

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

orthoefer · 23rd August 2006, 01:28 AM

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.

orthoefer · 3rd September 2006, 08:50 PM

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.

jleaman · 9th September 2006, 08:37 PM

I don't know how i missed this but SO NICE!!

orthoefer · 10th September 2006, 11:05 PM

I am mostly done.

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

orthoefer · 11th September 2006, 11:36 AM

I was asked where certain parts for this project come from. The decoder IC is from Rentron, and the case is from Lansing.

Arius · 12th September 2006, 10:26 PM

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.

15th August 2006, 05:38 PM	#1
orthoefer diyAudio Member Join Date: Apr 2006 Location: East TN	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.

3rd September 2006, 08:50 PM	#6
orthoefer diyAudio Member Join Date: Apr 2006 Location: East TN	A little progress 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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15th August 2006, 05:44 PM	#2
orthoefer diyAudio Member Join Date: Apr 2006 Location: East TN	Here is what I am working on for a circuit to drive a motorized potentiometer. It is essentially Brian Donegan's design. 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.

23rd August 2006, 12:44 AM	#3
orthoefer diyAudio Member Join Date: Apr 2006 Location: East TN	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.

23rd August 2006, 01:01 AM	#4
Gooch diyAudio Member Join Date: Aug 2005 Location: West Coast of Florida	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

23rd August 2006, 01:28 AM	#5
orthoefer diyAudio Member Join Date: Apr 2006 Location: East TN	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.

9th September 2006, 08:37 PM	#7
jleaman Banned Join Date: Apr 2002	I don't know how i missed this but SO NICE!!

10th September 2006, 11:05 PM	#8
orthoefer diyAudio Member Join Date: Apr 2006 Location: East TN	I am mostly done. If anyone is interested in my version of the remote board, I have one for sale ($30).

11th September 2006, 11:36 AM	#9
orthoefer diyAudio Member Join Date: Apr 2006 Location: East TN	I was asked where certain parts for this project come from. The decoder IC is from Rentron, and the case is from Lansing.

12th September 2006, 10:26 PM	#10
Arius diyAudio Member Join Date: Mar 2004 Location: California	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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