GB ends 12/3/2017 for Salas Boards
GB Ends on 12/3/17. Last week to buy. Please sign up in spreadsheet and Private message me for details.
GB Ends on 12/3/17. Last week to buy. Please sign up in spreadsheet and Private message me for details.
Tomorrow will be the last day of the GB. Please pay invoices or Private Message me for more details.
Today is last day of Group Buy. Please Private message me if interested, after signing up in spreadsheet. Boards will be ordered tomorrow.
Hi Salas
Can I use this board without the volume pot connections? I just want to use it as source selector.
Thanks
Can I use this board without the volume pot connections? I just want to use it as source selector.
Thanks
I believe you can.
Not sure whether I am doing right but I have the 10k stepped pot connected to the selector board and the output wires from the selector board go to the BA3 preamp board. Now when I remove the pot wiring and the rest remaining the same I do not get any sound output even though all looks fine.
When you want to use it as selector only, link the middle pot pads to their respective ones on the right.
Thanks Salas, then I will just use some molex small cables and jumper the middle pins as per your above image marked in "blue".
As I had molex pins on the board so used the molex small cables and shorted the hot pins as per Salas, and now it works flawlessly 🙂
Thanks Salas again, much appreciated and providing a very versatile board for the DIY community.
Thanks Salas again, much appreciated and providing a very versatile board for the DIY community.
A quick question here that Tea suggested i pose to the forum. I am planning to use the i-select as input selector for a BA-3 front end-based preamp. The BA-3 boards run off 24V, which comes from a 22V dual secondary 80VA transformer through a Rod Elliot LM3x7-based power supply. The power supply has an additional unregulated DC aux tap running approx 31V after rectification.
Since the i-select runs off either AC up to 22V or DC up to 30V, what would be the better option for power here:
a) AC 22V - i wonder, and Tea seemed to agree, that this is too high for comfort since it wouldnt take much fluctuation to bring it up too high. or
b) DC but put a dropping resistor before the i-select to drop something like 5-6V. I guess something like a 600 ohm, 2W (or 5 to be safe) would do?
Or another option? I suppose i could also tap one side of the 24V regulated DC output from the psu, but i am worried that might impact things downstream on the BA3 side?
Opinions appreciated!
Since the i-select runs off either AC up to 22V or DC up to 30V, what would be the better option for power here:
a) AC 22V - i wonder, and Tea seemed to agree, that this is too high for comfort since it wouldnt take much fluctuation to bring it up too high. or
b) DC but put a dropping resistor before the i-select to drop something like 5-6V. I guess something like a 600 ohm, 2W (or 5 to be safe) would do?
Or another option? I suppose i could also tap one side of the 24V regulated DC output from the psu, but i am worried that might impact things downstream on the BA3 side?
Opinions appreciated!
Your I-select will draw little current, so an easy option is to use a couple of cheap diodes in series to bring down the voltage by a few V. The 22V AC could be used this way. You should be able to feed the output of the diodes into the AC input of the I-select.
I would not use a resistor to bring the DC down because it can result in a variable voltage to the I-select (depending on it's variable load). You could use diodes in series to bring the unregulated 31V DC down, just like for the AC input.
I would not use a resistor to bring the DC down because it can result in a variable voltage to the I-select (depending on it's variable load). You could use diodes in series to bring the unregulated 31V DC down, just like for the AC input.
Last edited:
A quick question here that Tea suggested i pose to the forum. I am planning to use the i-select as input selector for a BA-3 front end-based preamp. The BA-3 boards run off 24V, which comes from a 22V dual secondary 80VA transformer through a Rod Elliot LM3x7-based power supply. The power supply has an additional unregulated DC aux tap running approx 31V after rectification.
Since the i-select runs off either AC up to 22V or DC up to 30V, what would be the better option for power here:
a) AC 22V - i wonder, and Tea seemed to agree, that this is too high for comfort since it wouldnt take much fluctuation to bring it up too high. or
b) DC but put a dropping resistor before the i-select to drop something like 5-6V. I guess something like a 600 ohm, 2W (or 5 to be safe) would do?
Or another option? I suppose i could also tap one side of the 24V regulated DC output from the psu, but i am worried that might impact things downstream on the BA3 side?
Opinions appreciated!
I am using the same setup with the Salas BiB psu boards of +/-24V DC output. I tapped couple of wires from 0,+24V DC of the psu and powering the I-Select board and no issues at all. Go ahead and use the psu output as I can see that the Salas psu never had a drop of even 1mV when used both for powering the BA3 preamp as well as I-Select boards.
Your I-select will draw little current, so an easy option is to use a couple of cheap diodes in series to bring down the voltage by a few V. The 22V AC could be used this way. You should be able to feed the output of the diodes into the AC input of the I-select.
I would not use a resistor to bring the DC down because it can result in a variable voltage to the I-select (depending on it's variable load). You could use diodes in series to bring the unregulated 31V DC down, just like for the AC input.
Thanks AlbertNL, i would like to use the AC since its there, so this seems like a viable option. Let me just ask a potentially dumb question here (i am just a hobbyist, and learning at that): If i drop 6V DC with a resistor and wire that into the DC in on the board, won't that still give plenty of room for regulation by the i-select regulator, even if some voltage fluctuations occur?
But maybe regulated DC from the PSU as manniraj suggests is the way to go, my feeling is also that the power draw from the i-select is too small to matter much, but i wasnt sure...
Thanks for the input to both of you!
Thanks AlbertNL, i would like to use the AC since its there, so this seems like a viable option. Let me just ask a potentially dumb question here (i am just a hobbyist, and learning at that): If i drop 6V DC with a resistor and wire that into the DC in on the board, won't that still give plenty of room for regulation by the i-select regulator, even if some voltage fluctuations occur?
To be honest, I do not know. I am also just a hobbyist 🙂
The reason I would use a string of diodes is because I know it will do exactly what I want, namely a reduction by a voltage I can determine beforehand.
The voltage drop due to a resistor in series with the circuit will depend on the varying "resistance" of that circuit. It is quite possible that it will work fine in this or other cases. Not having analysed the circuit I opted for the easier/lazier fool-proof option: diodes.
Yes, pretty much any diode but do not use low voltage drop diodes as that defeats the purpose 🙂
The I-Select doc specifies 1N4003 for use on the board so there probably is a reason not to use 1N4001 or 1N4002.
I would use any of the 1N4003 through 1N4007 (you can mix if you do not have enough of the same type).
The I-Select doc specifies 1N4003 for use on the board so there probably is a reason not to use 1N4001 or 1N4002.
I would use any of the 1N4003 through 1N4007 (you can mix if you do not have enough of the same type).
Good stuff, i've put in an order for parts for Pass HPA and Ba-3 Front end preamp so i added a handfull of extra 1N4004s and will try those out. Thanks for advice!
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