More like blending the hot and not hot, but I know what you mean :-)It involves blending the hot and cold
Location: Halifax, UK
Posts: 1,399
I'm Nick.
More like blending the hot and not hot, but I know what you mean :-)It involves blending the hot and cold
Nick.
i think they (tortuga) got the matching sorted with software.. which imho is the differentiating characteristic of the tortuga vs other LDR pre's... of course the totrtuga is more expensive too
I'm writing this from a phone so please excuse the typos
http://www.tortugaaudio.com/ldr3b-ba...preamp-update/
Location: North Island New Zealand
Posts: 1,757
I'm Chris.
Hi
A balanced version of our stereo coffee can be done. We have done two of these. We use a double L pad , one pad does Hot, the other does Cold. Matching of 8 LDR's is required for one stereo input as you want hot and cold to be the same. The double L pad configuration requires 2 of our control boards, and a dual gang pot, ... er and many patient hours.
Cheers / Chris
Location: North Island New Zealand
Posts: 1,757
I'm Chris.
Hi
We have reduced our prices on both our 3 input and single input kits http://stores.ebay.com.au/stereo-coffee
Stereo coffee LDR kits do not use relays, rather we provide for our 3 input model, 6 matched Series LDRs and 2 matched Shunt LDR's, To switch inputs we simply turn the anodes of the series pair of LDR's off, the input you were listening fades out to silence and the next commences.
There are very good reasons not to use any switching of signal paths at all, including relays or conventional switches as one contact on another causes audio degradation, and is the very reason why LDR's are used in our kits to overcome any switching of signal paths. We offer our kits with or without the RCA connector block, if you want to direct wire your audio system or choose to use cable of your choice.
Cheers / Chris
Location: North Island New Zealand
Posts: 1,757
I'm Chris.
Hi
A review of our Stereo Coffee LDR 3 input kit here: https://lencomotion.wordpress.com/20...-preamplifier/
Cheers / Chris
Interesting review Chris, and especially relevant here that he compared it to a Khozmo with z-foils.
Jason™
Built by Hand, Tuned by Life
Location: North Island New Zealand
Posts: 1,757
I'm Chris.
Hi
We have our new website up and running http://www.stereocoffee.com
Cheers / Chris
Location: North Island New Zealand
Posts: 1,757
I'm Chris.
Hi
In response to the unsure present supply to EU markets we have adapted our kit so you get everything less the LDR's. As we all know matching LDR's takes a certain skill set to get resistances close. So this kit is for the more experienced, We will supply you with every bit of assistance. There are many suppliers with overnight or same day delivery of the NSL32SR2S and NSL32SR3 the latter also suitable for this kit.
*** Update, we have now adapted the stand alone kit, with a BIG thanks to NRG Neal's suggestion , so we supply you with matched LDR's which we will have as a separate item available shortly, but with the stand alone you will need to
carefully solder these in. We will do all the matching and labeling ie 1234 for a single input kit and update our instructions with lots of images so you can't make any errors, and you end up with a great sounding kit.***
The stand alone kit is now available at our website http://www.stereocoffee.com and includes in the price an assembled control board, a prepared LDR board for 3 inputs if and when you wish to expand or use them, a 500k potentiometer, and a switch for the anodes.Also flat rate shipping price is included from New Zealand. Separate listing will show matched LDRs as components suiting exact board placement
We will keep you advised when there is clearer indication of our assembled matched LDR provided boards returning to normal supply.
Cheers / Chris
Stand Alone Stereo Coffee Kit.jpg
So as we are on the same page the attached schematic shows a diagram of what we first use for getting LDR's close. The diagram shows connection to our control board and to relative points on the LDR board for series and shunt LDR's , so you will need a 250k 1/4 watt and a 56k 1/4 watt resistor, a small breadboard and some wire to attach.
Test LDR.jpg
Last edited by Light Dependant Resistor; 26-06-2014 at 12:11.
Chris, I don't see anything stopping you from supplying matched NSL32SR2S and NSL32SR3 separately as 'parts'...
Listening in a Foo free Zone...
Only a Sith deals in absolutes.
Location: North Island New Zealand
Posts: 1,757
I'm Chris.