Print Page - What is LDR?

Title: What is LDR?
Post by: k1enneth on February 13, 2005, 08:58:18 AM

I have a Roland AS-1 Sustainer schematic...it shows a LDR 70ohm resistance under "incandescent source". I think it stands for light dependet resistor.
But nothing appears in the MOUSER catalog. What is a current replacement for the same item?

Title: What is LDR?
Post by: tungngruv on February 13, 2005, 09:21:08 AM

That is what they are, light dependet resistors. I got mine from Steve at SmallBear.

Title: What is LDR?
Post by: sir_modulus on February 13, 2005, 09:35:08 AM

Heres the link for Small bear. See if there is anything that would be about right.

Smallbear (http://www.smallbearelec.com/Search.bok?category=Photocells+and+Photocouplers)

Cheers,

Nish

Title: What is LDR?
Post by: vfr800fiman on February 13, 2005, 03:09:09 PM

You can use a photocell at radioshack also.
http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F011%5F002%5F006%5F000&product%5Fid=276%2D1657&find=photocell(keyword)&site=search

Title: What is LDR?
Post by: Marek on February 13, 2005, 04:08:55 PM

That AS-1 seems like a nice semi-vintage build :-)
http://www.geocities.jp/hirock2001/diy2/effect-comp01.html
Can we see the schematic?

About the LDR's:

westfalia.de is selling following types of 'Fotowiderstand':

A: 20 Ohm - 0,2 MOhm
B: 250 Ohm - 0,9 MOhm
C: 170 Ohm - 1 MOhm

And conrad.de is selling 'FotowiderstÃ¤nde' which have resistance range between 75-300 Ohm @ 1000 lx(?), and
10 Mohm @ 0 lx.

There are also some other types, which seem less interesting, with the resistance range from

A: 28 K Ohm @ 10 Lx - 1.4 K Ohm
B: 8,3 K Ohm - 85 K Ohm
C 8.0 K OHm - 100 K OHm

Well, its your choice...

Greetings,
Marek

p.s. If that AS-1 schematic is too shy to show in public, you can also mail it to me :-) tdkburn@musician.org

Title: as 1 schematic
Post by: k1enneth on February 13, 2005, 07:38:30 PM

http://www.geofex.com/FX_images/rolandsu.gif

I am looking for a "supersustain" type of pedal that does not have a lot of distortion such as Proco Rat or Fuzz Face... I have not HEARD the roland supersustain AS-1, I have only read the review of the above pedal at Harmony Central. If anyone has heard the pedal thru a tube amp, please give a definiiive review of the sound. Thanks

Title: What is LDR?
Post by: Marek on February 13, 2005, 08:13:49 PM

Listen:

http://polophonic.hp.infoseek.co.jp/as1/as1.html

Title: AS1 sustainer
Post by: k1enneth on February 13, 2005, 10:34:55 PM

I don't know if he was pushing the sound thru a strong tube amp. It sounded
like a solid state amp. That makes a huge difference in sound. But thanks for the sample. Maybe build this pedal and a fuzz face clone and A/B them.

DIYstompboxes.com

DIY Stompboxes => Building your own stompbox => Topic started by: k1enneth on February 13, 2005, 08:58:18 AM