I should have bought more
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- Wed Feb 22, 2023 7:12 pm
- Forum: Everyones Projects
- Topic: It's time I built a D3a -> 5687 phonostage
- Replies: 78
- Views: 59902
Re: It's time I built a D3a -> 5687 phonostage
- Wed Feb 22, 2023 7:03 pm
- Forum: Everyones Projects
- Topic: It's time I built a D3a -> 5687 phonostage
- Replies: 78
- Views: 59902
Re: It's time I built a D3a -> 5687 phonostage
Haven't looked recently, usually paid above a fiver for mine.IslandPink wrote: ↑Wed Feb 22, 2023 6:52 pm Re. D3a ,They are a lot more expensive than they used to be, as well.
- Wed Feb 22, 2023 7:02 pm
- Forum: Everyones Projects
- Topic: It's time I built a D3a -> 5687 phonostage
- Replies: 78
- Views: 59902
Re: It's time I built a D3a -> 5687 phonostage
I guess you could use a interstage, but again I think you are assuming the problem exists that needs a solution. I guess you could use a small cap into a high impedance buffer such as a op amp with voltage protection clamps on its inputs. A lot of the Japanese "DIY" designs of yesteryear ...
- Wed Feb 22, 2023 6:31 pm
- Forum: Everyones Projects
- Topic: It's time I built a D3a -> 5687 phonostage
- Replies: 78
- Views: 59902
Re: It's time I built a D3a -> 5687 phonostage
I used two of these https://uk.farnell.com/vishay/f339mx263031mym2t0/cap-30-f-20-pp/dp/1902188 Use spice to decide what value you want to use, or follow Andrews path and send yourself mad trying to find a way to avoid the caps. If you drive it with matching Z you can terminate with a high Z, I thin...
- Thu Feb 16, 2023 9:25 am
- Forum: News
- Topic: Nicola Sturgeon...
- Replies: 13
- Views: 8171
Re: Nicola Sturgeon...
I am not certain it wasn't the other way around, she wasn't dogged enough
Better the devil you know....
- Wed Feb 15, 2023 2:29 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 326
- Views: 95339
Re: C3g Aikido Phono
They look great, Simon!
I also found it useful to increase the size of the default pads on some of the resistor and capacitor models, making the diameters as large as the width's of the tracks they sat upon.
I also found it useful to increase the size of the default pads on some of the resistor and capacitor models, making the diameters as large as the width's of the tracks they sat upon.
- Sat Feb 11, 2023 5:56 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 326
- Views: 95339
Re: C3g Aikido Phono
I would increase the gaps a bit now between the tracks and the fill ins.
- Sat Feb 11, 2023 1:54 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 326
- Views: 95339
Re: C3g Aikido Phono
No, reason not to make the tracks thicker too, or even create blocks of voltage.
- Fri Feb 10, 2023 1:49 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 326
- Views: 95339
Re: C3g Aikido Phono
The hot air gun is a good idea, tho' in practical terms, if you have a paint stripper sized gun, then a small nozzle adapter would give more precise and controlled results, sort of a low tech rework station.
- Fri Feb 10, 2023 1:14 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 326
- Views: 95339
Re: C3g Aikido Phono
Thanks Andrew. I've tried to keep connections as short as practicable, the physical size of some of the caps makes this a bit tricky though, particularly the 10uF on the C3g and the 47nF teflon in the RIAA. Interesting you mention the thermal reliefs. I've left them switched on - I struggled to get...
- Fri Feb 10, 2023 12:22 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 326
- Views: 95339
Re: C3g Aikido Phono
The other bit of advice I would give is that you shouldn't assume caps are evil, or any other component, I think I was of that opinion, it's coloured thinking, it's all about a balances of compromises. All components have inherent weaknesses and strengths, the evil bit is not recognizing that and ma...
- Fri Feb 10, 2023 12:15 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 326
- Views: 95339
Re: C3g Aikido Phono
The trick I was taught was to try and keep as much of the copper as possible, take a look at one of the DC heater boards, oh, and keep the connections as short as you can, tho' I appreciate some compromises are often required. I also tend to switch of the thermal reliefs for thru hole components. Ro...
- Mon Feb 06, 2023 4:28 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 326
- Views: 95339
Re: C3g Aikido Phono
If you are feeling a tad masochistic, Simon, then this is probably worth a read re: pentode's capacitance.
http://www.r-type.org/articles/art-004c.htm
http://www.r-type.org/articles/art-004c.htm
- Fri Feb 03, 2023 3:01 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 326
- Views: 95339
- Fri Feb 03, 2023 2:53 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 326
- Views: 95339
Re: C3g Aikido Phono
Next sim is with a 15k series resistor before the RIAA, and the RIAA values changed as discussed previously. RIAA new 1.png Now there appears to be 1.6dB difference, but it looks nicer above 1kHz By adding the series resistance you have made it an easier load but the bass now rolls off, doesn't it?