No problem, this then will be 50kohms as seen by the Lightspeed
Cheers George
Yes, please do that and compare one versus two power amplifier inputs. Let us know what you hear. I have just added a parallel amplifier channel on three of eleven LDR channels, and although I have not tuned it, those 50K loads seem to be tracking well with the single 100K amps.
I asked a similar question on this outstanding website last year and a member suggested connecting a 100Kohm resistor in parallel to each single amplifier, if in fact volume tracking is affected.
Beyond the need to re-tune for my added drivers, it still sounds great over here.
I asked a similar question on this outstanding website last year and a member suggested connecting a 100Kohm resistor in parallel to each single amplifier, if in fact volume tracking is affected.
Beyond the need to re-tune for my added drivers, it still sounds great over here.
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I am contemplating the Lightspeed for use as an attenuator between my Conrad Johnson PV10 preamp and my NAD 2200 mono-blocks. Right now there is too much gain which renders the preamp useless. Can the output of the PV10 go into the lightspeed and the output from the lightspeed feed the mono-blocks?
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Yes no problem, the CJ is 650ohms and the Nad 25kohms, after you've done that, then just try the source/s into the Lightspeed and the Lightspeed into the Nad (leaving the CJ out) and see what you think, as the Nad is 700mV input sensitivity for full output, so you really don't need and active preamp at all because most sources give out over 2v.
Cheers George
Cheers George
Volume level comes on too quick in my design, 100k log gives good range from zero to half then come on quicker for the second half.
Cheers George
Almost.
You can use 10k but you won't like how quick it comes up, and no you won't break the LDR's, as the voltage to them stays the same if your full up or at min regarless of whitch pot/s you use.
Cheers George
Well, it’s been a minute, but Lightspeeds are now available for purchase again !
We have limited stock, but exactly the same as George’s original design.
Future releases & models will have added function, but for now we’re sticking with what we know works.
Happy Listening
Scott
We have limited stock, but exactly the same as George’s original design.
Future releases & models will have added function, but for now we’re sticking with what we know works.
Happy Listening
Scott
Use a linear dual pot, which has much better tracking, with a "law faking" resistor from the wiper to ground.
Adjust the value of the resistor to suit the desired taper.
https://www.diyaudio.com/community/threads/fake-law-log-pot.71951/
Adjust the value of the resistor to suit the desired taper.
https://www.diyaudio.com/community/threads/fake-law-log-pot.71951/
This is a great "pot" to use. It is a stepped attenuator using surface mount devices. It is very small and affordable. They track better than any pot I've ever checked. And they are pretty cheap!
eBay stepped attenuator
Stuart
eBay stepped attenuator
Stuart
Yes, I've used those stepped stereo log pots for years. It will track perfectly (within 1%).
Around $15 each on ebay. Don't let the price fool you, they are high quality and work great.
Available with round flatted shaft or knurled shaft, values 10k 20k 50k 100k.
Around $15 each on ebay. Don't let the price fool you, they are high quality and work great.
Available with round flatted shaft or knurled shaft, values 10k 20k 50k 100k.
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