On the shunts, the red cap is vref right ? What type and value did you use ?
On the shunt output, what el cap value did you use ?
On the shunt output, what el cap value did you use ?
The red cap is a 4u7 Wima MKP4 and its for the reg's termination Zobel. For Vref there is a 470uF Nichicon KZ.
Niiiiiiiiice 🙂
I can picture it above my DCB1... With two supa-dupa-huge heatsinks on the back to handle the extreme hotrodding... And everyone shall tremble before the awesomeness... 😛 😀 😀 😀
I can picture it above my DCB1... With two supa-dupa-huge heatsinks on the back to handle the extreme hotrodding... And everyone shall tremble before the awesomeness... 😛 😀 😀 😀
Thanks. It took quite a number of considerations until finishing a practical PCB version. Open loop can be wild.
You don't hot rod it because when making an oven of a phono box your input stage will be drifting.😀
You can use cranked up Bibs and leave the local regs unpopulated.😉
(Although it plays very coherently as it is, probably due to layout tightness with its regs).
(Although it plays very coherently as it is, probably due to layout tightness with its regs).
Ricardo, this is a simplified tighter 1.1 type reg especially made for the PCB phono. So it does not resemble the general use ones and it can perplex you on first look. Even some values are tweaked. The boards quality proved very best by the way. No corrosion with handling, very easy to solder, and very tough.
Hihi...
Seriously they seem awesome man... can' t wait to get my hands on a pair of these babies 🙂
Found this out the hard way. Run cool on BIB and 2SK369 Sources. Too hot would drift and sounded totally different.
How about we sank everything except the power mosfets into resin to seal them from the heat and vibration? 🙂
Why would anyone like to perplex the future paleontologists with what kind of organism was a K369 bug preserved in resin, escapes me.😀
An externally hosted image should be here but it was not working when we last tested it.
You could try to match the resistors' positive tempco with caps of the same but opposite tempco, so that the time constants wouldn't change. I'm not sure how the JFETs' tempco influences the circuit.
How does the LEDs' voltage drop behave under temperature change?
How does the LEDs' voltage drop behave under temperature change?
As it is biased, the Norton Vref in the regs has a red LED compensation for its JFET CCS and measures very stable after 5 mins of warm up. The input stage runs circa 75% IDSS and its also nicely stable. Just don't push the ambient temp in the box with hot rod ideas is the precaution so to avoid tipping the tested thermal balance. Making it as the assembly notes will describe its enough to stay care free. I tested it for many hours in hot summer room temps near 30C with its lid closed and it did not do funny stuff.
http://www.ka-electronics.com/Images/pdf/Junction_Temperature_LED_Tempco.pdf
http://www.ka-electronics.com/Images/pdf/Junction_Temperature_LED_Tempco.pdf
Guide
Here is the Folded Simplistic Phono PCB build guide...
Takes some repeat reading for newcomers but this phono thread veterans will surely grasp it fast.
I have added MM compatibility values too. I kept it shortest possible, really.😀
If you spot mistakes let me know to correct and upload again.
I have sent to Tea what's needed for the PCB production also.
Group buy link.
Here is the Folded Simplistic Phono PCB build guide...
Takes some repeat reading for newcomers but this phono thread veterans will surely grasp it fast.
I have added MM compatibility values too. I kept it shortest possible, really.😀
If you spot mistakes let me know to correct and upload again.
I have sent to Tea what's needed for the PCB production also.
Group buy link.