Btw: ZM... The biasmeters i bought, are 0-1vdc, (Bias is around 0.6vdc) so i dont need trimmer right, only capacitor for taking the inrush?, Right?
Jesper.
Sure 🙂... By inrush i meant peakvoltage!
Anyway, i mean by the quistion about resistor in series, maybee to take the worst peak (small ~5-10ohm) Resistor to form a RC lowpass filter, like done in some eq's... Donno if it works at all, on pure DC voltage though.
Jesper.
no use of cap with small resistor value
think of time constant
so , it'll work directly connected ....... and there is no significant voltage peak across Rs , where I believe you want to connect da thingie
think of time constant
so , it'll work directly connected ....... and there is no significant voltage peak across Rs , where I believe you want to connect da thingie
Evening 🙂
https://www.youtube.com/watch?v=cLPQ9vVKq3k
Thought i would share my testing with those bias-meter's i got...
When power is applied to Amp., then there is a short voltagepeak, giving the meters a "chock" so needle inside meters, goes banging at mechanical stop 😱
So i tried capacitor across terminals, but eventhrough this makes sense, it was having no effect (i even tried 100uF)... This is a mysteri for me, but maybee the induction/whatever from the meter/amp. makes the capacitor loose here ?
Well, i tried series resistor instead, and found 330ohm to be a little to much, 150ohm to little (Needle bangs a little with this resistance)... 221ohm is just right... Needle has to be a little adjusted for giving the right value, but this can also be seen on the video...
Just the adventure for this day 😀
Jesper.
https://www.youtube.com/watch?v=cLPQ9vVKq3k
Thought i would share my testing with those bias-meter's i got...
When power is applied to Amp., then there is a short voltagepeak, giving the meters a "chock" so needle inside meters, goes banging at mechanical stop 😱
So i tried capacitor across terminals, but eventhrough this makes sense, it was having no effect (i even tried 100uF)... This is a mysteri for me, but maybee the induction/whatever from the meter/amp. makes the capacitor loose here ?
Well, i tried series resistor instead, and found 330ohm to be a little to much, 150ohm to little (Needle bangs a little with this resistance)... 221ohm is just right... Needle has to be a little adjusted for giving the right value, but this can also be seen on the video...
Just the adventure for this day 😀
Jesper.
Real slow diy
Hi here...
This is, as heading veeery slow diy... sry... 🙂
Today, i have been testing for longterm stability (~3hours)... Bias is now 0.55V (1.3A) - Heatsink and torrids around 45C. or so.
DC-offset is stable at +/- 3mV both channels... Bias is rocksteady... no change here, except at moment when DC-offset is callibrated/set, there bias is changing a bit ofcause.
Biasmeters adjusted to show ~0.525vdc, so it's perfect.
I have wrote to Didiet78, asking him if he would update the schematic and pcb, just in case others here would like to build it?
anyway... build is still ongoing 🙂
Jesper.
Hi here...
This is, as heading veeery slow diy... sry... 🙂
Today, i have been testing for longterm stability (~3hours)... Bias is now 0.55V (1.3A) - Heatsink and torrids around 45C. or so.
DC-offset is stable at +/- 3mV both channels... Bias is rocksteady... no change here, except at moment when DC-offset is callibrated/set, there bias is changing a bit ofcause.
Biasmeters adjusted to show ~0.525vdc, so it's perfect.
I have wrote to Didiet78, asking him if he would update the schematic and pcb, just in case others here would like to build it?
anyway... build is still ongoing 🙂
Jesper.
Attachments
Hey Salas welcome 😀
Imidiatly, but i think they are not very sensitive!
https://www.youtube.com/watch?v=cLPQ9vVKq3k
Jesper.
Weekend of listning now i think!
Hi all.
This weekend will be in the name of class-A music i think... finally finished my chassis... been a long stroggle, not perfect, but many years of doing this diyaudio have learned me, not to be 100% perfect allway's...
Chassis is handmade, with limited tool's, but good enough, and perfect to around 100Watt of dissipation or so.
I am really looking forward to see how it plays with Salas's perfect preamp 🙂
This setup will be capacitor-less also; never had such pre+power without cap's in signalpath!... maybe i can hear, maybee not? - Full dual mono both amp's, so expection very good channelseperation... let's see how it goes? 😛
More to come... and have yourself a nice evening all.
Jesper.
Hi all.
This weekend will be in the name of class-A music i think... finally finished my chassis... been a long stroggle, not perfect, but many years of doing this diyaudio have learned me, not to be 100% perfect allway's...
Chassis is handmade, with limited tool's, but good enough, and perfect to around 100Watt of dissipation or so.
I am really looking forward to see how it plays with Salas's perfect preamp 🙂
This setup will be capacitor-less also; never had such pre+power without cap's in signalpath!... maybe i can hear, maybee not? - Full dual mono both amp's, so expection very good channelseperation... let's see how it goes? 😛
More to come... and have yourself a nice evening all.
Jesper.
Attachments
)
Warning both serious and offtopic
Hi all...
I attached here a lot of pictures, including some offtopic ones, showing my/our homeautomation system.
So poor naigbours here 😀 ... been playing all morning; kids not here, so peace in house for now (well not so problematic as they are 19 and 16 years)...
Playing both redbook's flac's from my NAS, also trying some hi-rez one's...
The IQaudio pihat does it well (New DAC to come next winther, but that's another story)
Here some hi-rez one's playing :
Some other hi-rez :
First impression, is the quiet - absolutely quiet setup except from a very slight buzzing torid (not much, but could be heard with ear on top of the alephJ_Mimi!... nevermind that.
While listning to my favorites, this AlephJ compared to my LM4780... Easy to hear better channel seperation, and what i did not expect was a more "highish" soft-through topend. --- This is most impressive to listning to; it's like the topend is filling more to the music now! -did not expect that.
Bass is close to the gainclone, maybe it's a bit better? -More time is needed for me to conclude.
Woow playing Alicia's Keys NewYork, gives the thrill 😱
I really like this setup, i think it's going to sit here for long.
The AlephJ is very easy for salas's pre. to drive it seem's, volume don't go much more than halfway up (Source is 2vrms)... Also old recording's like Sade and like, play's very loud when demanded.. so i think the impedances and gain are matching very well!
Now for offtopic 😉 :
This is my Pi-home automation system, as can be seen, the quality is good enough, and very stable too 🙂 (Uptime!) :
This system, was actually very fun to do... also i think it's an easy way of controlling the switch on/off hifi, the right way easy for everybody here (foolproof)
Jesper.
Hi all...
I attached here a lot of pictures, including some offtopic ones, showing my/our homeautomation system.
So poor naigbours here 😀 ... been playing all morning; kids not here, so peace in house for now (well not so problematic as they are 19 and 16 years)...
Playing both redbook's flac's from my NAS, also trying some hi-rez one's...
The IQaudio pihat does it well (New DAC to come next winther, but that's another story)
Here some hi-rez one's playing :
Some other hi-rez :
First impression, is the quiet - absolutely quiet setup except from a very slight buzzing torid (not much, but could be heard with ear on top of the alephJ_Mimi!... nevermind that.
While listning to my favorites, this AlephJ compared to my LM4780... Easy to hear better channel seperation, and what i did not expect was a more "highish" soft-through topend. --- This is most impressive to listning to; it's like the topend is filling more to the music now! -did not expect that.
Bass is close to the gainclone, maybe it's a bit better? -More time is needed for me to conclude.
Woow playing Alicia's Keys NewYork, gives the thrill 😱
I really like this setup, i think it's going to sit here for long.
The AlephJ is very easy for salas's pre. to drive it seem's, volume don't go much more than halfway up (Source is 2vrms)... Also old recording's like Sade and like, play's very loud when demanded.. so i think the impedances and gain are matching very well!
Now for offtopic 😉 :
This is my Pi-home automation system, as can be seen, the quality is good enough, and very stable too 🙂 (Uptime!) :
This system, was actually very fun to do... also i think it's an easy way of controlling the switch on/off hifi, the right way easy for everybody here (foolproof)
Jesper.
Attachments
- Status
- Not open for further replies.