LDR as buffer ?

[tinitus]

is it possible to use LDR as fixed buffer ?
and would it make sense ?

[DF96]

Light Dependent Resistor?

[jackinnj]

you've got the issues of temperature dependency

[tinitus]

yeah, its just a resistor

active devices are more clever

[tinitus]

Originally Posted by jackinnj

you've got the issues of temperature dependency

better say I was thinking of use in bass guitar

I guess no other way than using as variable resistor, meaning att

so it might still make sense to use simple LDR att to replace passive volume pot in a bass guitar with passive pickups

in that case, what is highest possible INput impedance with LDR att ?

I think a passive bass guitar pickup has 10kohm out, or more

[DF96]

Have I landed in a parallel universe where passive components like an LDR can act like active components e.g. to provide signal buffering? Or have I misunderstood something?

[tinitus]

Originally Posted by DF96

Or have I misunderstood something?

if you saying impedances are no different from ordinary passive att, I would be the one who have misunderstood it all

[DF96]

Maybe its the word 'buffer' which confused me. In RF you can use an attenuator pad to reduce the effect which two things have on each other, so I suppose that could be called a buffer. Never heard it used in this way in audio. Normally a buffer is something like a CF/SF/EF or the op-amp equivalent.

[tinitus]

yeah, I got off on the wrong foot, and too fast, thinking there might be a way to reverse the LDR
maybe I was more like approaching opto/photo signal transfer
probably simpler to just build ordinary SS buffer

I know LarsClausen designed a phono module using photo/opto signal transfer, somehow

but with the high impedances, and added att, one buffer doesn't seem to be enough
optimally two buffers needed, which kind of bothers me

If this goes in any sensible direction the thread title may change