A twisted tale about a logarithmic relay attenuator - Page 11

Nordic · 9th March 2006, 02:48 PM

Lol Brian, we appreciate what you guys do....

Another question... Could boards be so adjusted that one can use balanced or unbalanced inputs, say, flipping a switch.

BrianDonegan · 9th March 2006, 02:51 PM

Yes, it works that way automatically. If you set it up for balanced opperation (two relay boards), single ended inputs will work fine.

promitheus · 9th March 2006, 03:00 PM

Can you guys make a PCB to adapt a Lorlin rotary switch that can switch the input with one contact and switch on LEDS with the other contact.
Something like the Aleph P would be cool where the LEDS are in a circle or line beside or above the selector knob.

BrianDonegan · 9th March 2006, 03:28 PM

Quote:

Can you guys make a PCB to adapt a Lorlin rotary switch that can switch the input with one contact and switch on LEDS with the other contact.

For the attenuator or the source selector?

For the attenuator, we use a pot, not a rotary switch, so that would not work.

For the source selector (Darwin) you could do it with a single deck rotary switch. Just run GND to the switch's common, then from each position tap back to the darwin input header. Then run +5V to the LEDs+ (common) and a resistor from the switch taps to the LED-. There is no audio signal going through the switch, so no worries there, and the switch can be a cheaper unit.

BrianDonegan · 14th March 2006, 03:06 PM

So, about the kit resistors...

Russ and I have talked it over quite a bit. I am currently planning on including Phoenix MRS .6W resistrs in the kits. Here's the
datasheet.

We also discussed Dales (RN60), but they are fairly large for this board. Comments?

joster · 14th March 2006, 03:11 PM

'fairly large' as in uncomfortable, or won't fit?

Russ White · 14th March 2006, 03:26 PM

Quote:

Originally posted by joster
'fairly large' as in uncomfortable, or won't fit?

They will fit, but not as well. RN55s would fit better.

The Pheonix I think are the best choice.

jleaman · 22nd March 2006, 07:53 PM

For this to work you have to use 2 boards right ? because it is balanced input. You'll need one board per input.?

BrianDonegan · 22nd March 2006, 07:57 PM

For balanced operation, yes, two relay boards. For Single Ended, one relay board.

jleaman · 22nd March 2006, 07:59 PM

Quote:

Originally posted by BrianDonegan
For balanced operation, yes, two relay boards. For Single Ended, one relay board.

One more question. This will allow me to use regular rca in and use balanced out right. ? I'm new to this balanced stuff.

9th March 2006, 02:51 PM	#102
BrianDonegan diyAudio Member Join Date: Dec 2004 Location: Rock Ridge	Yes, it works that way automatically. If you set it up for balanced opperation (two relay boards), single ended inputs will work fine. __________________ Twisted Pear Audio

14th March 2006, 03:06 PM	#105
BrianDonegan diyAudio Member Join Date: Dec 2004 Location: Rock Ridge	So, about the kit resistors... Russ and I have talked it over quite a bit. I am currently planning on including Phoenix MRS .6W resistrs in the kits. Here's the datasheet. We also discussed Dales (RN60), but they are fairly large for this board. Comments? __________________ Twisted Pear Audio

22nd March 2006, 07:53 PM	#108
jleaman diyAudio Member Join Date: Apr 2002 Location: Nanaimo	For this to work you have to use 2 boards right ? because it is balanced input. You'll need one board per input.? __________________ Baby Danika, Born January 20th 1:54am.. http://itsparks.dyndns.orgMix a LittleUntangle&Opendns.org Perfect..

22nd March 2006, 07:57 PM	#109
BrianDonegan diyAudio Member Join Date: Dec 2004 Location: Rock Ridge	For balanced operation, yes, two relay boards. For Single Ended, one relay board. __________________ Twisted Pear Audio

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9th March 2006, 02:48 PM	#101
Nordic diyAudio Member Join Date: Sep 2005	Lol Brian, we appreciate what you guys do.... Another question... Could boards be so adjusted that one can use balanced or unbalanced inputs, say, flipping a switch.

9th March 2006, 03:00 PM	#103
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	Can you guys make a PCB to adapt a Lorlin rotary switch that can switch the input with one contact and switch on LEDS with the other contact. Something like the Aleph P would be cool where the LEDS are in a circle or line beside or above the selector knob.

14th March 2006, 03:11 PM	#106
joster diyAudio Member Join Date: Sep 2004 Location: St Louis	'fairly large' as in uncomfortable, or won't fit?

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