Has any one built one of these? I bought the kit and put it together. . .works and sounds good except at lowest volume I am getting sound. . .I set it up exactly as the instructions indicated. Any suggestions would be appreciated. Thanks.
A attenuator using LDRs... sort of similar to this one:
http://www.diyaudio.com/forums/anal...man-optical-volume-control.html?highlight=LDR
😀
OK, ZM will be expositing more about his PSMOVC in a couple of days.. hint hint.
Your patience will be rewarded choky!
Mark
Your patience will be rewarded choky!
Mark
I have a rather very simple solution (IMHO elegant too 😉) to this...I'll not reveal it just yet though, sorry.
ZM's PSMOVC might be able to do it too...Choky?
There is a bit of sound at minimum volume because the shunt LDRs cannot be set to 0R at minimum volume as otherwise they will overheat. This will sound louder or softer depending on your source output, amp and speaker efficiency. It will also depend on the lowest shunt resistance you set, which should be less than 70R and greater than 50R. It will help if your series LDRs are set to some high resistance >10k at minimum volume.
In my Lighter Note and 88dB speakers this doesn't bother me as I always leave the volume control in my listening range (9 - 11 o'clock). It's a small price to pay for the quantum jump in sonics.
You are right Bernie7...on some amps though with higher gain or speakers with greater sensitivity, <70R and >50R might not be enough.
Right you are too Choky...mere mortals only have inspirations.
Right you are too Choky...mere mortals only have inspirations.
Can also try adding a resistor of say 10k to the series LDR to reduce min volume level. This will reduce the entire volume range as well.
Not sure if this will affect SQ since it adds an extra part to the signal path, a non-LDR part at that 🙄
Not sure if this will affect SQ since it adds an extra part to the signal path, a non-LDR part at that 🙄
Not a welcome addition for some of the purists out there 
especially that it's on the signal path...
especially that it's on the signal path...
You're always going to have resistors in a circuit! I'll bet a lot of people would at least consider one extra resistor soldered in if it solves their particular problem. Certainly would be nice to hear about a cleverer method.
Nothing groundbreaking...on an LDR vol control less is more takes on the meaning we like from a simple circuit...fact is I can live with the whisper or I can just pause by remote the cd player to mute. We're just so used to hearing golden silence while turning the knob max counterclockwise it might bug us to hear some sound...
Don't hold your breath though...I've seen it on the bench I just need to put it together for a listen.
Don't hold your breath though...I've seen it on the bench I just need to put it together for a listen.
LDR preamp
I bought my kit from Uriah and one of the things that I heard before I bought it was that the volume control didnt go down to 0 db. It doesnt bother me at all. It is the best sounding preamp I have hear. I can deal with the low volume coming out of it. It sounds great at any volume. Now if I could just make a balanced one I would be set. Anyone make a balanced lighternote?
I bought my kit from Uriah and one of the things that I heard before I bought it was that the volume control didnt go down to 0 db. It doesnt bother me at all. It is the best sounding preamp I have hear. I can deal with the low volume coming out of it. It sounds great at any volume. Now if I could just make a balanced one I would be set. Anyone make a balanced lighternote?
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