The only two replacements that I could find are 2SK212-C and J201, both with similar vgs and idss values.IvIark wrote:Thanks for the info.
I'm doing it through-hole so I'll check the specs of the 2SK208 and try to choose a similar alternative
AMT Electronics - S1 Legend series [schematic]
- mensur
- Breadboard Brother
- Ice-9
- Degoop Doctor
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I hve some 2SK208 (JR) versions on the way, I bought some JY versions on ebay and i asked the seller if he could source some JR's for me, he kindy stuck them in the post free of charge. Just got to wait till they arrive now.
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?
No silicon heaven ? preposterous ! Where would all the calculators go ?
- Ice-9
- Degoop Doctor
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I am just going through the AMT P1 schematic here and checking it off against mr P1 pedal. I notice that the fet marked Q1 in the schematic is not a 2SK208 (JR) it has markings 6AS but there difficult to make out, and there is no D1 Bat 54 on it's gate either. The first fet seems to be just a buffer like on the S1 pedal.mensur wrote:Here's AMT P1
@Mensur could you please check your PCB revision . Mine is marked as V.3A, i'm just wondering if there has been some changes to the circuits in different PCB revisions ?
Good find on th ereplacement JR's
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?
No silicon heaven ? preposterous ! Where would all the calculators go ?
- mensur
- Breadboard Brother
I made a mistake, the diode isn't there, but the FET is 6AS.Mine is V.2A.The first fet doesn't need to be hi gain, 2N5458 is used in other versions, cause of the high VGS,so it doesn't clip the signal.Do you have more of these pedals?
- Ice-9
- Degoop Doctor
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Thanks for clearing that up, I thought that would be the case. I had breadboarded some of the S1 using j201 and 2n5457 for the first buffer stage and it is a clean stage.mensur wrote:I made a mistake, the diode isn't there, but the FET is 6AS.Mine is V.2A.The first fet doesn't need to be hi gain, 2N5458 is used in other versions, cause of the high VGS,so it doesn't clip the signal.Do you have more of these pedals?
I had the S1 and then I got the P1. I'm not getting any others because the new range of legend 2 pedals should be available soon and I might get one of those instead.
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?
No silicon heaven ? preposterous ! Where would all the calculators go ?
- Ice-9
- Degoop Doctor
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I noticed you have 1 missing value for C5 in the schematic, as it's a small ceremic SMD component I have just removed it from my P1 and measured it with a capactance meter, its value on the meter is 244n so allowing for inacuracies I would think it is a 220n cap.mensur wrote:Here's AMT P1
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?
No silicon heaven ? preposterous ! Where would all the calculators go ?
Please Can you verify ref on Q9 and Q10?
On my R1 version I read M6 or MG on SOT23 package.
Other package are SOT323(JR)
On my R1 version I read M6 or MG on SOT23 package.
Other package are SOT323(JR)
- mensur
- Breadboard Brother
Ice, can you desolder VD6, and clarify which diode is it?Ice-9 wrote:I noticed you have 1 missing value for C5 in the schematic, as it's a small ceremic SMD component I have just removed it from my P1 and measured it with a capactance meter, its value on the meter is 244n so allowing for inacuracies I would think it is a 220n cap.mensur wrote:Here's AMT P1
- Ice-9
- Degoop Doctor
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Is it VD6 from the S1 or P1 pedal you need to know.mensur wrote:Ice, can you desolder VD6, and clarify which diode is it?Ice-9 wrote:I noticed you have 1 missing value for C5 in the schematic, as it's a small ceremic SMD component I have just removed it from my P1 and measured it with a capactance meter, its value on the meter is 244n so allowing for inacuracies I would think it is a 220n cap.mensur wrote:Here's AMT P1
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?
No silicon heaven ? preposterous ! Where would all the calculators go ?
- Ice-9
- Degoop Doctor
Information
VD6 on the S1 pedal is a 1N5822 schottky diode on the P1 the same diode is VD8. Polarity protection
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?
No silicon heaven ? preposterous ! Where would all the calculators go ?
Hi
Noting schemes recently added, I'm realizing that the schematic
I draw about B1 pedal there are some missing components.
I am preparing a new updated schematic and soon I'll be adding to
the forum.
Thank you all for your contributions.
Greetings and see you soon
Noting schemes recently added, I'm realizing that the schematic
I draw about B1 pedal there are some missing components.
I am preparing a new updated schematic and soon I'll be adding to
the forum.
Thank you all for your contributions.
Greetings and see you soon
- Ice-9
- Degoop Doctor
Information
yeah ! it's a beast of a size diode.mensur wrote:1N5822 is in a bit large case DO-27A?Ice-9 wrote:VD6 on the S1 pedal is a 1N5822 schottky diode on the P1 the same diode is VD8. Polarity protection
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?
No silicon heaven ? preposterous ! Where would all the calculators go ?
- mensur
- Breadboard Brother
We could use any other schottky diode, like BAT47.Ice-9 wrote:yeah ! it's a beast of a size diode.mensur wrote:1N5822 is in a bit large case DO-27A?Ice-9 wrote:VD6 on the S1 pedal is a 1N5822 schottky diode on the P1 the same diode is VD8. Polarity protection
- Ice-9
- Degoop Doctor
Information
For polarity protection in all my builds i now only use Mosfets these days, I never use the standard diode protection.mensur wrote:We could use any other schottky diode, like BAT47.Ice-9 wrote:yeah ! it's a beast of a size diode.mensur wrote:1N5822 is in a bit large case DO-27A?Ice-9 wrote:VD6 on the S1 pedal is a 1N5822 schottky diode on the P1 the same diode is VD8. Polarity protection
It's fairly straight forward, if you want to start it , press start. You can work out the rest of the controls for yourself !
No silicon heaven ? preposterous ! Where would all the calculators go ?
No silicon heaven ? preposterous ! Where would all the calculators go ?
- Liquids
- Breadboard Brother
Can you draw a simple picture of how you do that?Ice-9 wrote:For polarity protection in all my builds i now only use Mosfets these days, I never use the standard diode protection.mensur wrote:We could use any other schottky diode, like BAT47.Ice-9 wrote:yeah ! it's a beast of a size diode.mensur wrote:1N5822 is in a bit large case DO-27A?Ice-9 wrote:VD6 on the S1 pedal is a 1N5822 schottky diode on the P1 the same diode is VD8. Polarity protection
I don't build polarity protection into anything I build - and I build only for myself. Invariably, it will catch up with me but...
However, and ironically, I REGULARLY fry components of all kind in my breadboarding, due to 'oops' power hookups, backwards chips, AC power, dead shorts to ground with a regulator supplying power, etc...annoying, but at least it didn't fry a finished pedal...? I guess I'm Q&D when breadboarding and 'wear kid gloves' when assembling and powering my pedals. I did have a rack unit that was powered with an AC wall wort...the rest all powered by a one-spot...so I color coded the two with red (danger - AC power) and grey (nothing special, just 9v DC) ribbons via a knot at the plug end, so as to differentiate the two clearly even under cable tangles.
Anyhow, I've digressed - the mosfet seems wise since it can really functiona like a zener in one direction and a regular diode in the other. I'm also curious the percieved (or actual) benefit of using a mosfet instead of the standard diode with anode to ground approach for a positive DC voltage pedal.
By the way, will that diode with anode to ground at the DC power supply connection do anything to spare a pedal that gets an AC adaptor plugged into it? Or only save it from a negative DC voltage adaptor?