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Old 13th March 2013, 04:13 PM   #5021
udailey is offline udailey  United States
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yeah its already in the casing. the other thing is that 40 ohms from this LDR is about as low as any LDR will go.
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Old 27th March 2013, 12:08 AM   #5022
FOXYE is offline FOXYE  Israel
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What is the cheapest way to build pre amplifier based LDR for testing vs Alps blue?

Anyone thinking of selling one?
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Old 27th March 2013, 12:47 AM   #5023
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Hi, i've got 1 4 sale- check my signature.
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Old 27th March 2013, 01:50 AM   #5024
udailey is offline udailey  United States
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George's Lightspeed circuit really couldnt get any less expensive unless you used a zener supply and no trimmers.
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Old 27th March 2013, 04:44 AM   #5025
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From memory this guy in his original ad said he just got a new production Lightspeed Attenuator from me, so he's selling his home made one, he's relisted it, and it's lower in price now.

Lightspeed attenuator - Canuck Audio Mart

Cheers George
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Old 27th March 2013, 12:58 PM   #5026
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yes, that's me too. I never said it was an original.
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Old 27th March 2013, 09:20 PM   #5027
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Misunterstanding, sorry merlin I did not mean you said the one your selling is original, I said it was home made, (diy).


Cheers George
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Old 22nd April 2013, 12:52 AM   #5028
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Brought one of my lightspeed attenuators to the local GTA meetup and unfortunately had bad luck as my voltage regulator started smoking.

I thought I had brought the wrong adapter, but I checked it and got about 17vdc out of it (it's rated for 12v).

I've got to replace my voltage regulator (L7805ABV), but should I replace my adapter too? Is it putting out more voltage than the regulator can handle?
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Old 22nd April 2013, 01:03 AM   #5029
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The Lightspeed's internal regulator is 5vdc 1amp and can take from 8-20vdc what happened was the polartity of the wall wart you bought was most probably - negative centre instead of + positive centre, if so this would take out the first electro cap around 100uf 25v and also the L7805 regulator. Should cost no more than ten dollars from a electronics shop, just remember which way the regulator was and also the cap.

Cheers George
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Old 22nd April 2013, 01:58 AM   #5030
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Better that there is a 1 amp series diode on the board, and appropriate instructions to constructors. Such a diode would alleviate dangerous reverse polarity circumstances
as can occur with reverse polarity and particularly electrolytic capacitors exposed to reverse polarity.
see; Troubleshooting analog circuits - Pease - Google Books

. Cheers / Chris
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