Poor Serbian Man Lightspeed packages

[Zen Mod]

so - details are here : http://www.diyaudio.com/forums/showt...74#post1751574

"A" package : PCB01 + PCB02 + 2 matched quartets of Silonex LDRs
that's for stereo balanced configuration .
price for package - 105 Euro , worldwide shipping
and greedy Serbian Customs included


"B" package : PCB01 + PCB02 + 2 matched pairs of Silonex LDRs ;
that's for stereo unbalanced configuration .
price for package - 85 Euro ,worldwide shipping and
greedy Serbian Customs included

optionally - 4 matched 2SK170bl/2SJ74bl pairs - 15 Euro ;

there will be PCB02 iteration for dirt cheap J310 based buffers , but not yet ......

[DaveM]

How would you like payment? Paypal?

Yeah!! greedy DIY'er is very happy. This will bet the junk out of the way of my F4.

[Zen Mod]

Originally posted by DaveM
................... .

you can reach me on e-mail button under my post , or directly at >choky@neobee.net<

just loose those >< brackets .......

[Zen Mod]

re-post from PSM LS thread :



Guiness just asked interesting question - is it possible to use PSM LS + Buff in B2 manner ........

interesting question - even if I have thoughts about that possibility - I didn't expected that anyone can be interested ........

OK - Lego time .........

if you use PSM in unbalanced mode ( just 2 + 2 LDRs) , you can feed in parallel 2 + 2 buffers ( 2/channel) , introducing fixed attenuator ( two resistors ) between PSM and 2 of them ;

in that manner you'll have unbalanced PSM , with one stereo full throttle buffered out , and one stereo attenuated buffered out .

if you use PSM in balanced mode ( 4+4 LDRs ) and you need two sets of balanced outs , you must use two buffer pcbs ...... having 4+4 buffers ; 4 will be full throttle ( stereo balanced buffered out) and 4 will be fixed attenuated ( stereo balanced attenuated buffered out) .

in each case - you can set desired level of attenuation with any crappy pot between PSM and buffer stage , and later exchange it to set pair of resistors per leg .

I feel like I'm 5 yr young again ....... Lego is funnnnn

[Zen Mod]

again repost from PSM LS thread :

besides answer to Guiness - that is possible to use 4 channel buffer PCB02 as two stereo output buffers ( where one pair can be attenuated from various reasons ) .... there is another one :

Ulf asked - if using entire gadget in unbalanced - is it possible to use one pair of buffers as input buffers ?

yup - certainly - it's possible , either as buffer dedicated solely to one critical source ( read - with highish output impedance ) , or as general buffer - before LS stage itself .

something as G. Rollins's recent posting ...... somewhere in his threads.

[marc brown]

Is there any chance you would sell just the power supply PCB?

I'm building Paul Hynes' remote-controlled version of the lightspeed using a matched set of LDR's from Uriah. I still haven't settled on a power supply yet but yours looks very nice.

[tms0425]

Just curious how you would implement a remote control version of the balanced version, for Pumpie?

[DaveM]

I plan to simply use a remote motor driven pot. The whole circuit is driven by a pot, so that should do the trick.

[tms0425]

Originally posted by DaveM
I plan to simply use a remote motor driven pot. The whole circuit is driven by a pot, so that should do the trick.

True, but I was thinking more in terms of VCCS approach. Up/Down pushbuttons, with no pot at all.

[marc brown]

Originally posted by tms0425


True, but I was thinking more in terms of VCCS approach. Up/Down pushbuttons, with no pot at all.

Paul Hynes VCCS Remote Control approach. There up/down buttons (momentary switches) can be added to the front panel to implement a remote/manual solution.