It's correct this schematic for a balanced 10K shunt attenuator:
Or only needs the 10K resistor in the hot line?
An externally hosted image should be here but it was not working when we last tested it.
Or only needs the 10K resistor in the hot line?
Merlin,
you need both. If you omit the one in the cold line, your attenuator will affect the hot line only.
Cheers
Sebastian
you need both. If you omit the one in the cold line, your attenuator will affect the hot line only.
Cheers
Sebastian
Balance wiring schematic
Thanks for answers, I know that for balanced need the two resistors but the problem is when the input is a Single Ended signal remain the resistors in the ground see wiring schematic:
Thanks for answers, I know that for balanced need the two resistors but the problem is when the input is a Single Ended signal remain the resistors in the ground see wiring schematic:
An externally hosted image should be here but it was not working when we last tested it.
the attenuator in the Borbely diagram must be a precision matched switched attenuator to maintain the balanced impedance.
It is a two channel attenuator with both sides connected to signal ground
It is a two channel attenuator with both sides connected to signal ground
I use this 23 step 2 deck Shallco Switch Remote Package:
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
2deck forces you to adopt series style attenuator.
You must precision trim every resistor so ensure side to side matching.
You will need a second 2deck for the other audio channel.
I would expect that matching should be done to better than 0.1%. All the experts in the field suggest this as the minimum standard for good CMRR.
You must precision trim every resistor so ensure side to side matching.
You will need a second 2deck for the other audio channel.
I would expect that matching should be done to better than 0.1%. All the experts in the field suggest this as the minimum standard for good CMRR.
The two deck don't force me to do a series attenuator, I use it as shunt attenuator as this schematic for each deck:
The question is how can avoid the 10K resistor to ground when I connect a single ended signal?
An externally hosted image should be here but it was not working when we last tested it.
The question is how can avoid the 10K resistor to ground when I connect a single ended signal?
That wont work balanced in and single ended out. You will have to disconnect one of the inputs and shunt the other to ground. You'll also need a ground reference from your source.
If you use the switch bal/unbal can accept:
-Input bal & output unbal
-Input unbal & output unbal
-Input bal & output bal
About ground reference see Erno Borbely schematic.
I believe that for balanced can not do it with only 2 decks. Please specifie how can do it?
Yes I know as per Borbely schematic is as you said: every +-signal connected to ground but follows the same problem when needed & input single ended signal when used the switch for bal/unbal un the position unbal there is two wires connected to ground one of each with a 10k resistor???
I mind that the solution must be in the input selector adding the 10K series resistor in - signal there instead in the attenuator.
All resistors used are Shinkoh matched but surely aren't 0,1% tolerance only sure is both channels are using the same matcheds resistor.
The only problem, if it's a problem using mine schematic is that remain a little of signal almost extremely little near to silence, if I use 2 deck signal to ground sure I get the silence but the cost is very high & I mind don't worth the money.
The real solution (also expensive) will be 4 attenuators of 2 decks to do a real ladder attenuator, this will be the right & definitive approach but I have doubts that affects to better the quality sound....I believe more in the resistor quality & the contact attenuator so is the reason that I choose Shinkoh resistors & Shallco stepped attenuator.
If you want single ended output the shunt or series att has to go to ground. PERIOD. You can do whatever else you want, it's your unit.
there is no advantage to using a balanced feed to the attenuator and a balanced attenuator to send an unbalanced signal to the next stage.
If you use 1% resistors in the balanced sides of the transmitter and receiver, you lose much of the interference suppression that balanced can give you.
If you use 1% resistors in the balanced sides of the transmitter and receiver, you lose much of the interference suppression that balanced can give you.
You talkin to me? 😀
I know that, I don't know what he has in mind. I'm assuming he wants the ability to switch outputs for different amps or whatever.
Bill,
that was not directed to you.
You look like you know what is being discussed.
Merlin,
read why balanced is needed, when it becomes useful and how to use it.
Now look at what you are proposing. Are any of the attributes of a balanced connection useful to your set up?
If some are then go ahead. If not, then forget about a balanced attenuator.
that was not directed to you.
You look like you know what is being discussed.
Merlin,
read why balanced is needed, when it becomes useful and how to use it.
Now look at what you are proposing. Are any of the attributes of a balanced connection useful to your set up?
If some are then go ahead. If not, then forget about a balanced attenuator.
I know that there is no advantage using input balanced to output unbalanced, never told that, only told the possibilites with the switch bal/unbal.
About 1% resistors is only in the attenuator or in both Salas Simplistic NJFET RIAA & Erno Borbely I/V DAC too?
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