Search found 15710 matches
- Sun Feb 11, 2024 6:35 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82361
Re: C3g Aikido Phono
Yes, and also, because the input is now floating (assuming the cartridge is wired as is normal so the output is not connected to earth), any voltage generated in the 0v line down to the ground point at the output RCA's is not seen by the input valve as its common mode WRT the input.
- Sat Feb 10, 2024 12:55 am
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82361
Re: C3g Aikido Phono
Maybe.
- Fri Feb 09, 2024 11:34 pm
- Forum: Valves
- Topic: Valve amplifier service
- Replies: 176
- Views: 85023
Re: Valve amplifier service
Is the single cap C14 to allow ripple currents in the bridge to have an easy path to mains supply earth? Maybe, sounds like could be correct. Not ripple though, its 10nf, so will be to pass switching noise from the diodes I would have thought. HF signals will see the wire to the other end of the 0v...
- Fri Feb 09, 2024 11:30 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82361
Re: C3g Aikido Phono
Looks like fun, but going from *4 to *10 is not that trivial.
- Fri Feb 09, 2024 10:06 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82361
Re: C3g Aikido Phono
Just look at the phono circuit and think about the voltages you have and then think about the currents required to generate those voltages.
- Fri Feb 09, 2024 3:24 pm
- Forum: Valves
- Topic: Valve amplifier service
- Replies: 176
- Views: 85023
Re: Valve amplifier service
I think from the above description, you might also point the finger at your CD player. What is the CD player? Is it Type II isolated or does it have a ground connection? You could isolate the chassis and safety ground on the amp from the signal ground with a small resistor, but I dislike that idea i...
- Fri Feb 09, 2024 9:38 am
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82361
Re: C3g Aikido Phono
Hardly expert. The trick (as I have said before) with noise/hum I find is getting used to thinking in terms of current as being the driving aspect and voltage being a resultant. A lot of electronics (especially valve) gets us used to thinking in terms of voltage only. Bipolar solid state is about cu...
- Wed Feb 07, 2024 9:48 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82361
Re: C3g Aikido Phono
Well done. Not sure about the buzzing. Does pressing on the valve case alter it? Is it 50Hz, or something else?
- Wed Feb 07, 2024 11:54 am
- Forum: Assorted Stuff
- Topic: Zero emission road vehicles.
- Replies: 912
- Views: 398788
Re: Zero emission road vehicles.
"Crash Test Dummy Engineer". I tell you, with AI nobody's job is safe
- Sun Feb 04, 2024 10:29 pm
- Forum: Everyones Projects
- Topic: 6550 SE Amplifier
- Replies: 110
- Views: 9455
Re: 6550 SE Amplifier
I cant get my head round the way from -5 to 0 the grid line spacing is smaller. So introducing 2nd distortion which wont mitigate the high 2nd distortion of the 6550. Do you mean at the righthand end of the graph? This might be on purpose to reduce gain at large negative grid - ergo, AGC may be app...
- Sun Feb 04, 2024 6:36 pm
- Forum: Valves
- Topic: Valve amplifier service
- Replies: 176
- Views: 85023
Re: Valve amplifier service
If it is oscillating, I would have thought the output pentodes were more likely to be the cause, maybe grid and screen stoppers could be tried if not there already. Getting a ecc83 to do that seems unlikely at first sight.
- Sun Feb 04, 2024 7:52 am
- Forum: Assorted Stuff
- Topic: The Quackery Thread
- Replies: 360
- Views: 190515
Re: The Quackery Thread
Well we do have an electric blanket.
- Sat Feb 03, 2024 10:32 pm
- Forum: Everyones Projects
- Topic: 6550 SE Amplifier
- Replies: 110
- Views: 9455
Re: 6550 SE Amplifier
Yep grid stoppers worth using.
- Sat Feb 03, 2024 6:25 pm
- Forum: Assorted Stuff
- Topic: The Quackery Thread
- Replies: 360
- Views: 190515
Re: The Quackery Thread
See they do earthing shoes as well. Wonder how much better they are than these https://www.safetecdirect.co.uk/products/fc03/portwest-fc03-compositelite-esd-anti-static-perforated-safety-clog-sb-ae?sku=fc03bk/6&gad_source=1&gclid=Cj0KCQiA5fetBhC9ARIsAP1UMgFkbbFmfdF8s-cusqsPlbcqOL7qDGJtfFLvNT...
- Sun Jan 28, 2024 6:17 pm
- Forum: Beginners
- Topic: You know how polypropyline motor run caps…..
- Replies: 9
- Views: 3850
Re: You know how polypropyline motor run caps…..
I guess it depends on the cap. But if not specifically DC rated, I would expect 1.414 of AC voltage would be a safe limit. Not sure where the justification for higher multipliers would be from other than optimisum. I checked motor start cap on RS, it had this in the docs "Direct current operati...