I wrote several times my understanding of things ....... AVC is easier to get right (both making it and also using it) than TVC, from various reasons
now, if I don't need galvanic isolation, and I don't need it in most cases, I'm perfectly happy using AVC
btw. galvanic isolation is a way to avoid ground loops and buzz in general ....... which is a noise, sort of .... but we by noise usually think of higher frequencies, random nature (white noise, pink noise, bad noise
)
now, if I don't need galvanic isolation, and I don't need it in most cases, I'm perfectly happy using AVC
btw. galvanic isolation is a way to avoid ground loops and buzz in general ....... which is a noise, sort of .... but we by noise usually think of higher frequencies, random nature (white noise, pink noise, bad noise
)
Is there a link into a thread to look at a schematic on how the transformer is wired to get all the attenuator steps?
say which one you want to use, post link to data/info and I'll make funny pic exactly for that one
hop in https://www.diyaudio.com/community/threads/whats-wrong-with-the-kiss-boy.293169/ , say which AVC you intend to use, and you'll get funny pic
I see.......all the relays are for input selection......not for transformer coupled attenuator steps 🙂
I only need one input as my only source is from DAC.....so my iron-pre can be made very simple.
The fixed attenautor steps in dB you can set is good for me as I usual has too much gain in the loop.
Then it is also very different from the Luxman attenuator which is a TVC using a transformer with a lot of outputs.
I only need one input as my only source is from DAC.....so my iron-pre can be made very simple.
The fixed attenautor steps in dB you can set is good for me as I usual has too much gain in the loop.
Then it is also very different from the Luxman attenuator which is a TVC using a transformer with a lot of outputs.
if you build it bare to the bone, using just one input (so no relays needed) and without output autoformer ( if you don't need gain) it's still sorta B1 with more than decent PSU and pcb layout
that modest I am
that modest I am
It is a perfect simple pre for my purpose and I can set it to 2dB (instead of zero) if that is optimum.
Used with VFET amp all voltage gain will be with iron and also with M2X.
The JFET buffer need to be able to drive 2 x RCA cables where one cable goes to a D-class amp (driving the 15" woofer) which has 5k input impedance. But I guess this is not a problem?
I am using the SSII in the moment which has good drive capacity because it is also a headphone amp (power mosfet at output stage).
I have not followed the "Kiss-boy" very closely but from time to time looked at the "turtle" with all the thin twisted wires which I just assumed was transformer outputs but can see that it was "just" input selector wires.
If one day, there will be a TVC-kit (relay-controlled) I also "in" for that one 🙂
Used with VFET amp all voltage gain will be with iron and also with M2X.
The JFET buffer need to be able to drive 2 x RCA cables where one cable goes to a D-class amp (driving the 15" woofer) which has 5k input impedance. But I guess this is not a problem?
I am using the SSII in the moment which has good drive capacity because it is also a headphone amp (power mosfet at output stage).
I have not followed the "Kiss-boy" very closely but from time to time looked at the "turtle" with all the thin twisted wires which I just assumed was transformer outputs but can see that it was "just" input selector wires.
If one day, there will be a TVC-kit (relay-controlled) I also "in" for that one 🙂
all Giggly wiggly wires in Iron Pumpkin package are actually AVC taps, particular one(s) chosen by relay contact(s) and lead to output
Iron Pre is selector - resistive attenuator - buffer - autoformer (gain device) - out
Iron Pumpkin is selector - buffer - AVC (also gain device) - out
to not clutter this thread with Iron Pumpkin, there are 2+1 threads around, with all tiny details
Hi -
I am not 100% sure what you're asking, but I think you may be asking if we're keeping track of how many kits, and which kits people have expressed an interest in buying. If so, the answer is, yes. Great question. If you're also asking if I'll post those numbers, then apologies, but no.
There were a few purposes for the list over and above just getting folks names on the list.
- Get a gut check for the percentage of SE vs. Bal for board orders.
- Check interest in chassis / completion kits for potential future product(s).
- See what else folks may desire / any concerns etc.
- Check overall interest to determine if this would be a one-time offer or a permanent addition to the store. That determined whether contingencies for parts would be needed.
Once kits are ready to be ordered from the store, folks on the list will be notified and given an amount of time (yet to be determined) to make their purchases. If they don't, we move down the list. Beyond that, it will be a standard order from the store. We're hoping (but it's not likely) that no one will have to experience the "Out of Stock" notification on the page, but life isn't perfect in the world of parts shortages and obsolete parts.
Hope that gets you what you needed and also provides a bit of context for others that may be interested and those that have already expressed interest.
Cheers!
Hi,
yes that was my intend to know ... 🙂 AND personally for me when it could start .. but your answer is really ok for me and I will wait for the start PENG! 😎
Do you have a funny pic grafting the slagle avc onto iron pre? Once the new kit for iron pre comes, I would like to graft one on to my existing 2016 board iron pre.
Seems I recall adding up costs and comparing to going whole hog with iron turtle 🐢. Seemed like it might be cost effective to go turtle, but I wouldn't mind having slagle around for other purposes as well. Never too many preamps.
Anywho, would like to see how I would attach it to iron pre?
Russellc
How about AZMAA ?“LECUTA: a Luxman Electronically Controlled Ultimate Transformer Attenuator.”
I prefer the ZMAAA: Zen Mod Amazing Autoformer Attenuator…
AZMAA - “Sounds so good, it takes your breath away!”
(Pronounced as asthma)
(Pronounced as asthma)
I would say have it in store. I have built most of our diy preamps, it is top of heap in my opinion of the "in store" choices,......well, 2018 BA line stage is really good, but iron pre has iron! To not have it, (at least the board, I can see the whole kit could be problematic to keep in stock) would be non-productive.Hi -
I am not 100% sure what you're asking, but I think you may be asking if we're keeping track of how many kits, and which kits people have expressed an interest in buying. If so, the answer is, yes. Great question. If you're also asking if I'll post those numbers, then apologies, but no.
There were a few purposes for the list over and above just getting folks names on the list.
On to answering (partially) what I think was your actual question ... At the moment, if everyone that has expressed interest in kits follows through with a purchase, then some of those later on the list MAY not get their kits exactly with the same shipping time as those getting the first 50 / 100. As mentioned, after the first 50 / 100 are purchased, people will still be able to get kits, however the timing may be 'a bit later'.
- Get a gut check for the percentage of SE vs. Bal for board orders.
- Check interest in chassis / completion kits for potential future product(s).
- See what else folks may desire / any concerns etc.
- Check overall interest to determine if this would be a one-time offer or a permanent addition to the store. That determined whether contingencies for parts would be needed.
Once kits are ready to be ordered from the store, folks on the list will be notified and given an amount of time (yet to be determined) to make their purchases. If they don't, we move down the list. Beyond that, it will be a standard order from the store. We're hoping (but it's not likely) that no one will have to experience the "Out of Stock" notification on the page, but life isn't perfect in the world of parts shortages and obsolete parts.
Hope that gets you what you needed and also provides a bit of context for others that may be interested and those that have already expressed interest.
Cheers!
So, boys get signed up, may be only shot, short of those who can create boards. Judging by the number of beta tests and different board versions, cutting traces to eliminate hum etc, it may not be the easiest board to "get right" WAY above my pay grade!
Thanks for the effort! This is super, jfets from Nelson himself, cinemags included, too good! You want one of these, you really do guys.
Russellc
Perfect, look forward to build this.
So the "A" in AVC stands for "Autoformer". Then my first assumption was correct regarding the tiny wires......
just go in origin thread (or tips'n'tricks) and ask the same
no reason to not use these to keep this one clear, and later - when builds starts, I believe Jim will open dedicated thread