Lightspeed Attenuator a new passive preamp - Page 113

majkisk · 23rd January 2008, 01:29 PM

Thanks George

If my friends from Australia which plan to visit me order attenuator from You could You tell me about delivery time

regards

georgehifi · 23rd January 2008, 07:56 PM

Quote:

Originally posted by majkisk
Thanks George

If my friends from Australia which plan to visit me order attenuator from You could You tell me about delivery time

regards

This sort of sales information will have to be done off the forum with PM's, I don't think the moderators like it.

majkisk, I will have two in stock for immediate delivery in 2 days, one can be sent to Macedonia insured/air post for $50aud (30euro) or I can send it to your friends here in Australia.
Contact me with (PM below) with your email address and I will send some literature on the Lightspeed Attenuator to you.

http://www.diyaudio.com/forums/membe...rm&userid=8370

or you can just email me at ( georgehifiatoptusnet.com.au ) substitute the at for @

Cheers George

georgehifi · 24th January 2008, 06:51 AM

Passive Pre Amp forum? Yes please.

Vote here for it, if you haven't already.

http://www.diyaudio.com/request/

Cheers George

staggerlee · 26th January 2008, 08:15 PM

pietjer,

Can your CCS circuit be powered off of a 12v wallwort, or is a "cleaner" source recommended?

pietjers · 27th January 2008, 12:19 PM

Staggerlee,

The CCS is giving a very high rejection of mains related pollution, so a standard stabilized (!) 12V mains adapter is okay. The voltage of the power supply is not very critical. Every voltage between lets say 8V and 20V is okay.

Peter

Ryssen · 29th January 2008, 04:44 PM

If used on a balanced headphone amp,is the series opto on "hot" and the shunt to "cold" then?

mikelm · 29th January 2008, 06:03 PM

Quote:

Originally posted by Ryssen
If used on a balanced headphone amp,is the series opto on "hot" and the shunt to "cold" then?

For each channel you will need two series resistors & two shunt resistors.

Two series in hot & cold then after these two shunts from hot & cold to ground.

For pseudo balanced you could try having the same two series resistors but only one shunt - between hot & cold.

Ryssen · 29th January 2008, 06:20 PM

Quote:

For each channel you will need two series resistors & two shunt resistors.

So if I use the CCS circuit will I have to double that to,or can I paralell 2 opto couplers on each LM317,(they are matched).

mikelm · 29th January 2008, 06:37 PM

If you use the CCS cct then you can put the 4 opto couplers in series.

should be ok

I think 12 volts will still be enough but 15 volts would also work

pietjers · 1st February 2008, 12:38 PM

Knowing that some of you are building (or planning to build) the CCS version of the Lightspeed, I am very interested to hear from your results.
Please share your findings and thoughts.

Peter

24th January 2008, 06:51 AM	#1123
georgehifi diyAudio Member Join Date: Sep 2003 Location: Manly Australia (Jewel of the Pacific)	Passive Pre Amp forum? Yes please. Vote here for it, if you haven't already. http://www.diyaudio.com/request/ Cheers George __________________ Avatar : Production Lightspeed Attenuator www.lightspeedattenuator.com

26th January 2008, 08:15 PM	#1124
staggerlee diyAudio Member Join Date: Jan 2005 Location: United Snakes of a Merry Cow	12v for ccs pietjer, Can your CCS circuit be powered off of a 12v wallwort, or is a "cleaner" source recommended?

29th January 2008, 04:44 PM	#1126
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	If used on a balanced headphone amp,is the series opto on "hot" and the shunt to "cold" then? __________________ Regards Åke

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23rd January 2008, 01:29 PM	#1121
majkisk diyAudio Member Join Date: Jan 2008	Thanks George If my friends from Australia which plan to visit me order attenuator from You could You tell me about delivery time regards

27th January 2008, 12:19 PM	#1125
pietjers diyAudio Member Join Date: Oct 2006	Staggerlee, The CCS is giving a very high rejection of mains related pollution, so a standard stabilized (!) 12V mains adapter is okay. The voltage of the power supply is not very critical. Every voltage between lets say 8V and 20V is okay. Peter

29th January 2008, 06:37 PM	#1129
mikelm diyAudio Member Join Date: May 2003 Location: England	If you use the CCS cct then you can put the 4 opto couplers in series. should be ok I think 12 volts will still be enough but 15 volts would also work

1st February 2008, 12:38 PM	#1130
pietjers diyAudio Member Join Date: Oct 2006	Knowing that some of you are building (or planning to build) the CCS version of the Lightspeed, I am very interested to hear from your results. Please share your findings and thoughts. Peter

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