Print Page - what is an LDR

Title: what is an LDR
Post by: { antonio } on May 22, 2004, 10:56:39 PM

i wanted to know if you all could help me. what is an LDR? what does it do? what does LDR stand for?

i had seen them in a couple of schematics recently and i wanted to know what they were used for.

thanks so much.
javascript:emoticon(':wink:')
javascript:emoticon(':wink:')

Title: what is an LDR
Post by: MartyB on May 22, 2004, 11:16:15 PM

Light-Dependant Resistor. These can be used in combilation with LEDs or standard incandescent bulbs to provide an isolated variable resistance, such as in phase shifters. There are alot of commercially-available components that have a pre-assembled LED and LDR in a package called an optoisolator or optocoupler. Alot of diyers will jus use a LED/LDR pair - usually cheaper '8)"

Title: what is an LDR
Post by: Peter Snowberg on May 22, 2004, 11:48:32 PM

Here is what a typical unit looks like...

(http://edge.mcs.drexel.edu/assemblies/tests/assemblies-200209/cds-cell.jpg)

Take care,
-Peter

Title: what is an LDR
Post by: zener on May 23, 2004, 11:12:09 AM

It is a resistor which resistance varies depending from how much ( or how bright) light it receives. LDRs I have encountered are MORE LIGHT=LESS RESISTANCE.

Compressors and wah (Morley) are just two effects where you can usuallly find it.

Title: what is an LDR
Post by: RDV on May 23, 2004, 11:12:21 AM

Wasn't LDR one of the presidents?

:wink: :wink: :wink: :wink: :wink: :wink: :wink: :wink:

RDV

Title: what is an LDR
Post by: Lonehdrider on May 23, 2004, 12:17:31 PM

Yeah, Larry D. Roosevelt... :D

Regards,

Lone

Title: LDR
Post by: StephenGiles on May 23, 2004, 02:16:45 PM

Have you not heard of the Church of Latter Day Resistors!

Title: what is an LDR
Post by: puretube on May 23, 2004, 05:10:28 PM

is it possible to use a GWB in a LoFi pedal? :cry:

Title: what is an LDR
Post by: Hal on May 23, 2004, 05:16:40 PM

HAHA

its the new LoDow pedal :)

Title: so . . .
Post by: { antonio } on May 23, 2004, 09:22:15 PM

so does that mean they are the same thing as photo resistors?

Title: what is an LDR
Post by: Hal on May 23, 2004, 09:40:25 PM

yup!

DIYstompboxes.com

DIY Stompboxes => Building your own stompbox => Topic started by: { antonio } on May 22, 2004, 10:56:39 PM