Thanks very much for the informative and constructive responses.
I will try
and see his stepped attenuators which I would like to try with my amps.
Does he have a web page?
I will try
from memory his ebay user name is alex_550. I will check this when I finish work.
and see his stepped attenuators which I would like to try with my amps.
Does he have a web page?
He doesn't have attenuators-just fantastic switches for making them.
Great. Let me know if he has a link, web page or something.
I guess you have already seen this!
DIY "Lightspeed Attenuator" - Passive LDR Volume Control (audio optocouplers)
Only for interest!
DIY "Lightspeed Attenuator" - Passive LDR Volume Control (audio optocouplers)
Only for interest!
I guess you have already seen this!
Yep seen this and looked interesting, just a shame you can't buy matched pairs easily from manufacturers.
As far as I know,he only sells through his ebay shop. You can easily find him with his user name.
thxs got it. lets have a look.
something like this?
http://cgi.ebay.co.uk/Make-Before-Break-Rotary-Switch-1-pole-23-pos-Set-2-/310211169376?pt=LH_DefaultDomain_0&hash=item483a06cc60
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Many years ago I saw OP12 LDR's used in a box with a lamp.
I dont know what it would sound like. If the lamp failed the volume failed in the low/off state.
Just checking it seems they are not very stable, it might be interesting if there was a better device and use high brightness LED's.
Just for interest!
Regards
M. Gregg
I dont know what it would sound like. If the lamp failed the volume failed in the low/off state.
Just checking it seems they are not very stable, it might be interesting if there was a better device and use high brightness LED's.
Just for interest!
Regards
M. Gregg
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Yes Brit01, either those or some of the spectacular quality ceramic 2 pole ones if you don't feel(as I don't myself) that you need such fine adjustment.The heavily silver-plated contacts are normally a bit tarnished but this easily cleans to pristine brighness and easy solderability using an eraser.(this also works well on silver-plated tube sockets)
dynamic compressors
Photoresistor - Wikipedia, the free encyclopedia
Just for interest after a quick search seems it may still be used!
Sorry going off topic!
Photoresistor - Wikipedia, the free encyclopedia
Just for interest after a quick search seems it may still be used!
Sorry going off topic!
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Yep seen this and looked interesting, just a shame you can't buy matched pairs easily from manufacturers.
I dont know if its still available:
http://www.buildanamp.com/2-Light-Dependent-Resistors-LDRs_c2.htm
Not very cheap though!
Regards
M. Gregg
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Passive preamp is being sold already. The Truth Pre AmpI guess you have already seen this!
DIY "Lightspeed Attenuator" - Passive LDR Volume Control (audio optocouplers)
Only for interest!
Discussion link
Passive preamp is being sold already
Nice but a little pricey!
Think I might try some DIY light sensor/photoresistor design myself.
The Perkin Elmer Photoconductive Cell and Analog Optoisolators Data Sheet here is interesting.
http://www.datasheetcatalog.org/datasheet/perkinelmer/VT500.pdf
The VT43N1 looks interesting (VT400 series, page 17).
http://www.datasheetcatalog.org/datasheet/perkinelmer/VT500.pdf
The VT43N1 looks interesting (VT400 series, page 17).
wonder what would happen with 2 LDR's in series per side with middle connection as the output. In at the top, gnd at the bottom.
An LED on each LDR and a voltage adjuster on top "L" & bottom "R" led's to set balance.
Then volume adjust top and bottom LEDs togeather on left or right.
Just a thought.
Regards
M. Gregg
An LED on each LDR and a voltage adjuster on top "L" & bottom "R" led's to set balance.
Then volume adjust top and bottom LEDs togeather on left or right.
Just a thought.
Regards
M. Gregg
An LED on each LDR and a voltage adjuster on top "L" & bottom "R" led's to set balance.
Then volume adjust top and bottom LEDs togeather on left or right.
Just a thought.
good ideas here and certainly getting me enthusiastic as an alternative to pots.
Have to have a look at availability and price of the LDR's.
http://cgi.ebay.co.uk/Ceramic-VT43N1-LDR-Photocell-Resistor-400V-400mW-NEW-/220671416124?pt=LH_DefaultDomain_0&hash=item33610a973c
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- Voltage divider instead of expensive volume pot or stepped attenuator.