to Zachik #777
Hello Zachik,
it is well invested money. Especially if you want to build further amps. 🙄
For me 'matching devices' became an essential thing in amp-building...😀
Although matching some J113 for Idss could be done with a DMM, Battery
or PSU and some resistors or trimpot.....
Greets
Dirk
Hello Zachik,
it is well invested money. Especially if you want to build further amps. 🙄
For me 'matching devices' became an essential thing in amp-building...😀
Although matching some J113 for Idss could be done with a DMM, Battery
or PSU and some resistors or trimpot.....
Greets
Dirk
It seems that if two JFETs are matched in one point only the chance that both follows the same curves (a 100% curve match) is quite high?
About the peak DCA 75 the SOT23 adapter is very nice to get included so SOT23 JFETs can also be matched:
SOT23 Peak Component Adapter | Peak Electronic Design Limited
About the peak DCA 75 the SOT23 adapter is very nice to get included so SOT23 JFETs can also be matched:
SOT23 Peak Component Adapter | Peak Electronic Design Limited
Build guide. 90% complete, but good enough to make public. 🙂
ACP+ Headphone Amp / Linestage - diyAudio Guides
ACP+ Headphone Amp / Linestage - diyAudio Guides
Is there any benefit to using Nichicon UKZ (Premium Muse) over the Nichicon UFG (Fine Gold Muse) or UKT or UKW as according to Nichicon they point at the UKZ to be the more premium capacitor for audio use.
Also wouldn't it be better to use the Nichicon UPW series for the PSU filtering on the board rather than the Nichicon UKW as the UPW is for SMPS and features low impedance and high reliability whereas the UKW is suggested for audio use which I would assume is for use in the audio path.
Also I know the J74s have to be matched but is there a requirement to match the J113s up and if I don't will it make much of a difference listening wise?
What are people's thoughts?
Also wouldn't it be better to use the Nichicon UPW series for the PSU filtering on the board rather than the Nichicon UKW as the UPW is for SMPS and features low impedance and high reliability whereas the UKW is suggested for audio use which I would assume is for use in the audio path.
Also I know the J74s have to be matched but is there a requirement to match the J113s up and if I don't will it make much of a difference listening wise?
What are people's thoughts?
Last edited:
Use good parts from known distributors. Will work perfectly and sound fantastic.
SYclotron Audio | Why are people obsessed with coupling caps?
SYclotron Audio | Why are people obsessed with coupling caps?
"C5" 33pF capacitor
Hello,
I am new to the DIY community. So far, I have built a pair of ACA monoblocks. I am now in the process of building an Amp Camp Pre+. I have the PCB and have ordered all the componentry. However, I am concerned I did not get the right capacitor for "C5." What I have purchased is the following:
KEMET Multilayer Ceramic Capacitors MLCC - Leaded 25V 33pF C0G 1% LS=2.54mm
https://www.mouser.com/ProductDetai...=sGAEpiMZZMuMW9TJLBQkXsCwpBVvUMY/E/Vf72fPIj4=
Is this correct? If not, can someone point me in the right direction?
Thanks!
Hello,
I am new to the DIY community. So far, I have built a pair of ACA monoblocks. I am now in the process of building an Amp Camp Pre+. I have the PCB and have ordered all the componentry. However, I am concerned I did not get the right capacitor for "C5." What I have purchased is the following:
KEMET Multilayer Ceramic Capacitors MLCC - Leaded 25V 33pF C0G 1% LS=2.54mm
https://www.mouser.com/ProductDetai...=sGAEpiMZZMuMW9TJLBQkXsCwpBVvUMY/E/Vf72fPIj4=
Is this correct? If not, can someone point me in the right direction?
Thanks!
Don't take the thread's collective silence personally, it's the most craziest time of this already insane year.
Sounds cool...what are you using for remote volume? Is it remote input selection as well? Looks like maybe not, I think I see a manual rotary switch there.
What phono stage?
In the future I'd like to do a maxed-out full-featured preamp with remote-controlled volume and input selection, tone controls, and possibly phono...not sure about phone though, I may want to keep that in a separate chassis. I'll need to find a turnkey remote kit though because that is way over my head.
Oooo and is that one bag labelled "VU Driver"? Does that come as a kit too? Cause that's also something I'd love to implement in my dream DIY pre but don't have the knowledge to design on my own.
Sounds cool...what are you using for remote volume? Is it remote input selection as well? Looks like maybe not, I think I see a manual rotary switch there.
What phono stage?
In the future I'd like to do a maxed-out full-featured preamp with remote-controlled volume and input selection, tone controls, and possibly phono...not sure about phone though, I may want to keep that in a separate chassis. I'll need to find a turnkey remote kit though because that is way over my head.
Oooo and is that one bag labelled "VU Driver"? Does that come as a kit too? Cause that's also something I'd love to implement in my dream DIY pre but don't have the knowledge to design on my own.
Last edited:
Finished my ACP build
I built the ACA way back in 2012 as one of the first projects I ever did (recuperating from serious illness) and after some time away from diy saw Nelson had created a matching preamp. I’d recently dug out the ACA from its hibernation to perform as office/spare bedroom duties as I’ve spent the better part of the last year working in there. The build went well once I’d got the parts together...pretty straightforward. The trickiest bit as I only had a couple of J113’s was playing around with r4 values in circuit to get 10ma per channel. After some experimentation with a dvm and breaking out the calculator I ended up with 33r getting me just a shade over 10ma. All check out voltages were bang on straight off the bat which was a relief. It’s sounding very promising from the get go but I haven’t spent long enough listening (like half an hour) to properly evaluate. The naked form factor matches my ACA which for me was part of the appeal. I couldn’t find any nichicon gold in the right values so went for Panasonic’s which I’m sure are just as good or better. My favourite bit is the knurled volume knob which was like a fiver from China (ebay). The only thing to do is pick up a better power supply as I just used a cheapo I had to hand. Anyway that’s it another triumph of perseverence over knowledge :0). Thanks to Nelson for the design and the forum for the boards and fets. PS no idea why the one photo is rotated on upload.
I built the ACA way back in 2012 as one of the first projects I ever did (recuperating from serious illness) and after some time away from diy saw Nelson had created a matching preamp. I’d recently dug out the ACA from its hibernation to perform as office/spare bedroom duties as I’ve spent the better part of the last year working in there. The build went well once I’d got the parts together...pretty straightforward. The trickiest bit as I only had a couple of J113’s was playing around with r4 values in circuit to get 10ma per channel. After some experimentation with a dvm and breaking out the calculator I ended up with 33r getting me just a shade over 10ma. All check out voltages were bang on straight off the bat which was a relief. It’s sounding very promising from the get go but I haven’t spent long enough listening (like half an hour) to properly evaluate. The naked form factor matches my ACA which for me was part of the appeal. I couldn’t find any nichicon gold in the right values so went for Panasonic’s which I’m sure are just as good or better. My favourite bit is the knurled volume knob which was like a fiver from China (ebay). The only thing to do is pick up a better power supply as I just used a cheapo I had to hand. Anyway that’s it another triumph of perseverence over knowledge :0). Thanks to Nelson for the design and the forum for the boards and fets. PS no idea why the one photo is rotated on upload.
Attachments
Well done! I wouldn’t feel obligated to go all out on a power supply. There’s a good amount of filtering on the board to accommodate simple wall wart switchers.
to Waarn68
Hello Waarn68,
nice work on the ACP+! And I am sure - nice sound....
Do I see a Quad - pre-/poweramp - combo in the back of the pic?
Cheers!
Dirk
Hello Waarn68,
nice work on the ACP+! And I am sure - nice sound....
Do I see a Quad - pre-/poweramp - combo in the back of the pic?
Cheers!
Dirk
Thanks guys....yes it’s a cliche but I was already “hearing things I hadn’t” when using my previous preamp on the couple of test tracks I ran through it. The ACA wasn’t really warmed up though and I have to get the room ready for visitors.
Dirk yes ... quad but both in need of some Work...look nice though!
Mark Johnson is there a link to the switch mode filter board project?
Best
Mike
Dirk yes ... quad but both in need of some Work...look nice though!
Mark Johnson is there a link to the switch mode filter board project?
Best
Mike