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Old 12th September 2013, 12:16 AM   #1
diyAudio Member
 
Join Date: Sep 2004
Location: hobart tasmania
Smile Light Dependant Resistor 3 Input Preamp Kit

Hi
I have assembled LDR 3 input board, a control board potentiometer and switch - a kit for building your own 3 input LDR audiophile preamp, at my eBay shop:
stereo coffee items - Get great deals on items on eBay Stores!

I look forward to your consideration of my products.

Cheers / Chris
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Old 12th September 2013, 12:50 AM   #2
Jsixis is offline Jsixis  United States
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This listing () has been removed, or this item isn't available.
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Old 12th September 2013, 01:42 AM   #3
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Quote:
Originally Posted by Jsixis View Post
This listing () has been removed, or this item isn't available.
Sorry try:

a google search ebay store stereo-coffee

Should then display. as: items in stereo coffee store on eBay
Buy stereo coffee items on eBay


thanks for your interest. Chris

Last edited by Chris Daly; 12th September 2013 at 01:46 AM.
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Old 13th September 2013, 07:40 AM   #4
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Location: hobart tasmania
Sale Pricing on my 3 input LDR passive preamp kit until midnight 20/09/13
just $155.00 Au and shipping $30.00 Au with NZ Tracked postage.

8 matched NSL32SR2 optocouplers,with RCA outlets, Patent Applied for Control Board, 50k High quality Bourns Potentiometer and Switch.

Some technical specifications: LDR's measure and maintain between 1.4 and 2.00 volts making this design the best I know of for low distortion available. My own listening through ESL57 and Quad 303 confirms very high audio quality.

items in stereo coffee store on eBay!

Happy to assist with any questions. / Chris

Last edited by Chris Daly; 13th September 2013 at 08:03 AM.
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Old 14th September 2013, 12:18 AM   #5
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Hi
Just letting you know, there is NO signal switching on my LDR preamp. The 3 stereo inputs utilise 6 series LDR's and 2 Shunt LDR's for that reason.

The anode of the Series LDR's for each stereo input (on the DC side NOT on the signal side ) is switched.

In practice one input fades out whilst another comes in. Due to the extreme resistance of a off state LDR, this method is far better than relays or any switching of signal path.

My board also achieves direct wiring to the RCA socket and a short path circuit track for the other half of signal.

Also here are separate ground paths for DC cathode series, shunt , and signal

Cheers / Chris
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Old 14th September 2013, 06:08 AM   #6
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Join Date: Sep 2004
Location: hobart tasmania
We have added a Single Input Light Dependant resistor Kit to our eBay shop. Just $95.00 and $30 tracked shipping during our SALE

The single Input version allows you to expand to 3 inputs later with our Expansion Kit, some soldering skills needed.

It is supplied with our Patent applied for Control Board and high quality Bourns Potentiometer
stereo coffee items - Get great deals on items on eBay Stores!

I look forward to answering any questions you might have.
Cheers / Chris
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Old 27th September 2013, 12:20 AM   #7
awty is offline awty  Australia
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Thanks Chris for your help and fast postage. My kit turned up today. Nice little project for the weekend.
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Old 29th September 2013, 06:28 AM   #8
awty is offline awty  Australia
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This is my first attempt at any type of amp build. Very much a beginner when it comes to electronics, but I was able to follow Chris instruction and dont think I made any major mistakes. Works any way. I did add a 12 Led on light not sure if that affects anything.

BTY let me know if anything is wrong or can be improved.
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File Type: jpg LDR 3.jpg (413.9 KB, 638 views)
File Type: jpg LDR 2.jpg (253.2 KB, 601 views)
File Type: jpg LDR 1.jpg (310.6 KB, 551 views)
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Old 29th September 2013, 07:10 AM   #9
tubo is offline tubo  Philippines
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What about power supply?
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Old 29th September 2013, 07:16 AM   #10
awty is offline awty  Australia
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12 volt battery so far.

What should I use?
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