Search found 5599 matches

by simon
Fri Feb 23, 2024 6:55 pm
Forum: Everyones Projects
Topic: C3g Aikido Phono
Replies: 319
Views: 80657

Re: C3g Aikido Phono

Just measured them. Oh the evenings of fun you must have had measuring big bags of these things :-)
by simon
Fri Feb 23, 2024 1:40 pm
Forum: Everyones Projects
Topic: C3g Aikido Phono
Replies: 319
Views: 80657

Re: C3g Aikido Phono

And a padded envelope has just dropped through my letterbox, thanks muchly :-D. I'll rerun the sims for the change in D and S resistors and see whether the noise drop continues per each additional fet. I was thinking of using a pair, possibly 4, but is 8 per channel recommended? Or do I need to matc...
by simon
Fri Feb 23, 2024 1:25 pm
Forum: Everyones Projects
Topic: C3g Aikido Phono
Replies: 319
Views: 80657

Re: C3g Aikido Phono

Ah, got it. Yes that makes sense now. I still learnt something as I sussed something wasn't right :-)
by simon
Fri Feb 23, 2024 9:27 am
Forum: Everyones Projects
Topic: C3g Aikido Phono
Replies: 319
Views: 80657

Re: C3g Aikido Phono

Okay, you're suggesting the opposite to what I was thinking. But what I can't understand is with separate drain resistors, the outputs from each drain are in effect bypassing one of the drain resistors. Which is why I thought I might need a common drain resistor. What am I missing? (I sorted out the...
by simon
Thu Feb 22, 2024 9:07 pm
Forum: Speakers
Topic: TG "The Loudspeaker" Build (Sort of)
Replies: 63
Views: 5562

Re: TG "The Loudspeaker" Build (Sort of)

Is that really a 300L cab? :-D Impressively big. And that must be a small fortune of birch ply.
by simon
Thu Feb 22, 2024 8:59 pm
Forum: Everyones Projects
Topic: C3g Aikido Phono
Replies: 319
Views: 80657

Re: C3g Aikido Phono

Whilst thinking about drafting a pcb for this it occurred to me that the drain resistor I'd drawn for the second LSK170 is bypassed by the paralleled output from the second LSK170. The more I think about this the more I'm confusing myself. I found a Linear Systems application note which touches on p...
by simon
Thu Feb 22, 2024 9:24 am
Forum: Everyones Projects
Topic: Pass Sony VFET Project
Replies: 21
Views: 3091

Re: Pass Sony VFET Project

Thanks Ray
by simon
Wed Feb 21, 2024 10:31 pm
Forum: Speakers
Topic: TG "The Loudspeaker" Build (Sort of)
Replies: 63
Views: 5562

Re: TG "The Loudspeaker" Build (Sort of)

One builder did substitute the expensive BMS driver for a much cheaper Faital unit - and that is something I have done (I've already got the drivers). Which Faital drivers out of interest? Those BMS look impressive with a reckoned 28.5Hz from a vented 153L cab. That doesn't say how they would sound...
by simon
Wed Feb 21, 2024 10:16 pm
Forum: Everyones Projects
Topic: Pass Sony VFET Project
Replies: 21
Views: 3091

Re: Pass Sony VFET Project

Something else to learn Ray! I couldn't see any prices on the website, unlike pcbs, looks like you have to upload a file. What sort of money are they wanting? Could be very handy...
by simon
Wed Feb 21, 2024 7:48 pm
Forum: Everyones Projects
Topic: Pass Sony VFET Project
Replies: 21
Views: 3091

Re: Pass Sony VFET Project

Very interesting Ray. Do you send them a 3d dwg or dxf? I'll have to have a look on their website fir pricing.
by simon
Mon Feb 19, 2024 7:57 pm
Forum: Everyones Projects
Topic: On My Bench.
Replies: 84
Views: 28550

Re: On My Bench.

Strewth! I wouldn't know where to start with that. It's almost SMD size!
by simon
Sun Feb 18, 2024 5:08 pm
Forum: Everyones Projects
Topic: C3g Aikido Phono
Replies: 319
Views: 80657

Re: C3g Aikido Phono

2 x 9V in series is easy enough. Even without a switch they'd last a long time I guess.
by simon
Sun Feb 18, 2024 2:46 pm
Forum: Everyones Projects
Topic: On My Bench.
Replies: 84
Views: 28550

Re: On My Bench.

Dunno Dave, but the only place I've used tants is in 3 leg regs and I think the data sheet recommends much higher values of electrolytic than tantalum?

Not much help.
by simon
Sun Feb 18, 2024 2:44 pm
Forum: Everyones Projects
Topic: C3g Aikido Phono
Replies: 319
Views: 80657

Re: C3g Aikido Phono

Thinking about the power supply for this MC preamp stage I can't help thinking there's good potential to create ground loops if I'm not careful. Perhaps the easiest way to get a 12V PS is to use 3no. 4V or 5V zener on the end of the 230V shunt reg. The audio ground could then just loop from the inpu...
by simon
Fri Feb 16, 2024 9:20 pm
Forum: Everyones Projects
Topic: C3g Aikido Phono
Replies: 319
Views: 80657

Re: C3g Aikido Phono

Will do. Tripling the fets the common resistor beneath the source resistors needs decreasing to 12R, which gives a gain of 28.7dB. And knocks another 5 or 6 units off the noise. 4 paralleled fets needs the common resistor decreasing to 10R, giving a gain of 28.5dB. And knocks another 5 or 6 units of...