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- 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
- 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...
- 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
- 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...
- 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? Impressively big. And that must be a small fortune of birch ply.
- 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...
- 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
- 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...
- 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...
- 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.
- 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!
- 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.
- 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.
Not much help.
- 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...
- 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...