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Old 13th July 2011, 10:04 AM   #3071
AndrewT is offline AndrewT  Scotland
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Originally Posted by tinitus View Post
your jack plug would have left and right signal
you may notice a black plastic ring on the plug pin, which seperates left and right channel
tip and ring are signal. Sleeve (the long plain part of the plug) is always the ground. These plugs and sockets are referred to as TRS and can be used for balanced signals (two signals and a ground) as well.
regards Andrew T.
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Old 13th July 2011, 12:17 PM   #3072
troystg is offline troystg  United States
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To answer the question, Most circuits use a common signal ground between channels, so a 3 wire jack with a common signal return / ground "should" be ok.

I say should because I don't have the schematic on om work machine. I will look back in the thread.
Thinking positive doesn't make things better, it makes you a better person.
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Old 13th July 2011, 12:25 PM   #3073
rayw is offline rayw  United States
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Yeah, I got that. I was just concerned about connecting the left and right signal grounds together. Then I answered my own question by looking at the traces on the board to see that they're connected there so it's not a problem.
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Old 14th July 2011, 01:30 AM   #3074
CR500 is offline CR500  United States
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I'm jumping ahead of myself (I'm only up to page 55 - three years old) but need to put in an order for some parts. Is the 2sk170 still a good choice or should I be looking for something else. I plan to go with split rails (power brick for a supply).

I run a bi-amp'd system with an 11dB gain difference between the amps so I'll need to add a second section with gain (should I stick with the 2sk170 for the gain section).

I need the B2!!

Thanks and sorry for not reading through before posting questions.
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Old 14th July 2011, 10:28 PM   #3075
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Hello , I am new in the forum.After finishing Aleph-x project perfectly ,
I have finished my B1 buffer preamp and it runs well.
I want to use XLR input and output instead of RCA'S in one B1 Board.
I have already checked previous entries for XLR connections but there are only examples for 2 x B1 PCB boards.
Is there any possible solution to convert from RCA to XLR in and out.
I will not use RCAs if there is solution for XLR's, one input channel will also be enough.
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Old 14th July 2011, 10:53 PM   #3076
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The B1 does not convert balanced to unbalanced or vice versa, if that's
what you are asking about.

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Old 14th July 2011, 11:26 PM   #3077
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Thanks Nelson for your quick respone,
Sorry my english , may be I didn't explained well..
I am working with your orginal B1 PCB board and there are only 2 x RCA inputs and 1x RCA output..
My question ; is it possible to use with 3 pole XLR input and output connectors in current layout of B1 PCB board
(which needs pin 1 for ground/screen , pin2 for positive signal and for pin3 negative signal)
Pin1 and pin 2 are ok but for pin 3 which is negative signal which I struggled to solve, any suggestion or not possible with the current design.
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Old 15th July 2011, 07:19 AM   #3078
Itsmee is offline Itsmee  England
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You will need 4 channels of B1 (2x stereo) to make stereo balanced B1.
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Old 27th July 2011, 08:37 PM   #3079
Thago is offline Thago  Belgium
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I'm planning to build a balanced version of B1, and I'm gathering some components now. In the original schedule (Passdiy.com) some high quality film caps are required (C100, C200: 1uF and C101, C102: 10uF). I wonder if I could substitute the 1uF by a 3,3uF, and the 10uF by a 22 uF or a 33uF? I have laying around some Jantzen Audio Silver Z-cap (3,3uF) and Clarity Cap SA (22uF and 33uF). Mr. Pass mentions that they can be substituted by other values. Would there be any sonic implications?
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Old 28th July 2011, 09:15 AM   #3080
AndrewT is offline AndrewT  Scotland
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A balanced impedance connection must have the impedances balanced (matched) both at the transmit end and at the receive end. The B1 input will be the receive end. All the components that determine it's input impedance MUST be matched to a an accuracy you have determined is adequate for your use. This includes the Capacitor loading.

The output of the B1 is the transmit end. The resistor on the output dominates the send impedance, you can probably get away with matching the output resistor only and use nominal +-5% components for all the others.
regards Andrew T.
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