Search found 15710 matches
- Thu Feb 22, 2024 11:20 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82121
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. So I think I need a common drain resistor rather an individ...
- Sun Feb 18, 2024 3:44 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82121
Re: C3g Aikido Phono
I would strongly consider batteries of some form. Floating, quiet, whats not to like.
- Fri Feb 16, 2024 8:13 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82121
Re: C3g Aikido Phono
Send me your address
- Fri Feb 16, 2024 3:03 pm
- Forum: Assorted Stuff
- Topic: Nothing In Particular
- Replies: 16439
- Views: 4663884
Re: Nothing In Particular
The only reason he could think of as to why not was to increase profits for the meter manufacturers It may also be because they think it would be better if all the meters in the UK were at most 10 years out of date when it comes to new features. I can understand that that would be a worthwhile targ...
- Fri Feb 16, 2024 2:26 pm
- Forum: Assorted Stuff
- Topic: Nothing In Particular
- Replies: 16439
- Views: 4663884
Re: Nothing In Particular
Seems like this is known and expected (and not only the case for smart meters) All gas meters (Smart and traditional) have an internal battery that power them. This is designed to last for up to 20 years, with a meter recertification (exchanging the meter to replace it with a new one) scheduled ever...
- Fri Feb 16, 2024 1:59 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82121
Re: C3g Aikido Phono
Yep, you maybe need to compensate for any gain change. Its the S/N ratio that matters in this case. Also, you tend to get that sort of noise/f curve depending on the type of noise source (thermal, shot, partition etc ). Generally paralleling devices will reduce noise proportionally to square root of...
- Thu Feb 15, 2024 11:11 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82121
Re: C3g Aikido Phono
Yep the noise will reduce for every doubling of the FETs. I think there is a error though. The 40r source resistor is shorted out
- Thu Feb 15, 2024 9:28 am
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82121
Re: C3g Aikido Phono
The gate resistor will be needed for each one. in case you don't know, its job is to protect the fet if the input is sent too +ve. The gate/source junction will become a forward biased diode (as shown in the symbol) and its to prevent excess current in that case. This is one of these bits of informa...
- Wed Feb 14, 2024 9:49 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82121
Re: C3g Aikido Phono
You can play with the source resistor in the case of the jfet to alter the gain, and also try paralleling up 2 or more.
- Wed Feb 14, 2024 5:11 pm
- Forum: Everyones Projects
- Topic: 6550 SE Amplifier
- Replies: 110
- Views: 9441
Re: 6550 SE Amplifier
I normally use 100R on ecc88, I would have thought 10k would be more than enough.
- Tue Feb 13, 2024 7:57 pm
- Forum: Assorted Stuff
- Topic: Zero emission road vehicles.
- Replies: 912
- Views: 398448
- Tue Feb 13, 2024 7:54 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82121
Re: C3g Aikido Phono
The small signal section is for AC analysis of fr and phase. It may be you need to set that depending on the analysis you are showing. The left hand side is for voltage/current against time.
- Tue Feb 13, 2024 11:22 am
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82121
Re: C3g Aikido Phono
Are you using AC on the input? if so, whats the 1.4V
- Mon Feb 12, 2024 10:08 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82121
Re: C3g Aikido Phono
Q2 is upside down.
- Sun Feb 11, 2024 10:18 pm
- Forum: Everyones Projects
- Topic: C3g Aikido Phono
- Replies: 319
- Views: 82121
Re: C3g Aikido Phono
You should be able to ground the stepup metalwork, while leaving the windings floating. It may be ok to ground the primary if needed, but try and leave the secondary grounded via the phono stage.