> if the BD139 emitter resistor to 2SK2145 drains is 270mR, 27mR?
So do you understand what is its purpose ?
Patrick
So do you understand what is its purpose ?
Patrick
if preamp is able to drive interconnect cables , that's all ........ both Babelfish M25 and SissySIT having buffered input
well , I did my share of LTSpicing here .... will post in few day's time my sim, as soon I park my buttttttt on Mountain , now finishing all tiny things before departure
TAKE CARE - final schm with all details will be posted in few days too , with few missing details
posted one is fully functional , but still missing few protection diodes
will post most probably in separate thread , to keep future things cleaner
TAKE CARE - final schm with all details will be posted in few days too , with few missing details
posted one is fully functional , but still missing few protection diodes
will post most probably in separate thread , to keep future things cleaner
Hi Zen Mod,
May I shoot some questions on your SissySIT..
The 10K pot, 43K at the THF and 36K at the IRFP9240 are biased by the current through the gates, for predetermined parts?
What is the 100K+680p for?
Are BD139 and 140 voltage regulation?
Sorry to ask you while you are traveling. 🙂
May I shoot some questions on your SissySIT..
The 10K pot, 43K at the THF and 36K at the IRFP9240 are biased by the current through the gates, for predetermined parts?
What is the 100K+680p for?
Are BD139 and 140 voltage regulation?
Sorry to ask you while you are traveling. 🙂
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traveling in the morning , now making a pause from ..... everything about house (everyday's things) and enjoying my coffee
10K pot and ..... are conducting current between pos and neg PSU rails , amount of current being regulated by opto bjt , so that way tuning distance (read- voltage ) between gates , thus regulating Iq
gate current is there , but certainly (and we hope) not playing much in da game
100K+680p is for Edcor compensation and strictly linked to Edcor ; if using Cinemag or Jensen , that RC is unnecessary
BD139/40 are voltage umbrella for input JFets , keeping them at 12V-ish bay , so dissipation is in sane bracket
you can call them cascodes instead of umbrella , irrelevant
10K pot and ..... are conducting current between pos and neg PSU rails , amount of current being regulated by opto bjt , so that way tuning distance (read- voltage ) between gates , thus regulating Iq
gate current is there , but certainly (and we hope) not playing much in da game
100K+680p is for Edcor compensation and strictly linked to Edcor ; if using Cinemag or Jensen , that RC is unnecessary
BD139/40 are voltage umbrella for input JFets , keeping them at 12V-ish bay , so dissipation is in sane bracket
you can call them cascodes instead of umbrella , irrelevant
Thank you and excuse my typo, for this generous forum of fun.😀
I like the umbrella than cascade..
I like the umbrella than cascade..
you'll remember easy this way :
cascode is in direction of ordinate - stacked by height
cascade is in direction of abscise - simply lined by horizon
so , cascode acting as umbrella
cascade ..... well different thing
🙂
cascode is in direction of ordinate - stacked by height
cascade is in direction of abscise - simply lined by horizon
so , cascode acting as umbrella
cascade ..... well different thing
🙂
Thanks for the easy tip to recognize (possibly..)🙂
I've been listening to whatever clumsy DEFiSITs things I built and also comparing to the SIT-3.
SIT-3 makes me think about the use of autoformer. Is it for simplicity per Firstwatt moto or taming the sharp sound? Nothing is for free and autoformer step makes the sound different. Is this all part of the final decision? Maybe .. this is interesting imagination.
I see the amount of current can be regulated by opto bjt in the SissySIT.. just nice.
This optocoupler and the hall sensor.. I hope I can use myself to stabilize my DC coupled tube PP.
I've been listening to whatever clumsy DEFiSITs things I built and also comparing to the SIT-3.
SIT-3 makes me think about the use of autoformer. Is it for simplicity per Firstwatt moto or taming the sharp sound? Nothing is for free and autoformer step makes the sound different. Is this all part of the final decision? Maybe .. this is interesting imagination.
I see the amount of current can be regulated by opto bjt in the SissySIT.. just nice.
This optocoupler and the hall sensor.. I hope I can use myself to stabilize my DC coupled tube PP.
hall sensor not , too big current range
optocoupler across small cathode resistor or whatever , it is possible ; all you need is around 1V1 for proper operation of optocoupler
what is Iq and biasing voltage?
optocoupler across small cathode resistor or whatever , it is possible ; all you need is around 1V1 for proper operation of optocoupler
what is Iq and biasing voltage?
Yep hall sensor current range seems rather big.
The PP is Gary Pimm 47PP with 6AU6 at the front.
30-40mA? per tube. If 1.1V is needed maybe 20-30 ohms per 47 cathode can do..🙂
I still wonder.. The optocoupler is not a ON OFF device but a linear output like LDR?
The PP is Gary Pimm 47PP with 6AU6 at the front.
30-40mA? per tube. If 1.1V is needed maybe 20-30 ohms per 47 cathode can do..🙂
I still wonder.. The optocoupler is not a ON OFF device but a linear output like LDR?
Thank you, but then I am going too far .. I will try to look carefully and try, then ask you when in trouble. 🙂
It's here 🙂
http://web.archive.org/web/20131228031124im_/http://pimmlabs.com/web/47pp_9.gif
I was once hooked by differential tube PP..
http://web.archive.org/web/20131228031124im_/http://pimmlabs.com/web/47pp_9.gif
I was once hooked by differential tube PP..