I have it on good authority that 6ma range is ideal, at least with the circuit and provisions included with the BAF kits
Nice work and I can tell you’ve modified it somehow...blue led instead of red..lol
Where are your JFET Q1,Q2...it’s hard to tell from the top view.
BR
Eric
codyt,
Neat build, and congratulations on yet another successful build! 🙂
You have a habit of putting your amps in nice cases - what do you have in mind for this one?
Neat build, and congratulations on yet another successful build! 🙂
You have a habit of putting your amps in nice cases - what do you have in mind for this one?
Thanks!
ZMan, Honestly I plan to leave this one ‘caseless’ - at least for now 🙂
Eric, my Jfet pairs are beneath those shiny round thermal ‘caps’.
ZMan, Honestly I plan to leave this one ‘caseless’ - at least for now 🙂
Eric, my Jfet pairs are beneath those shiny round thermal ‘caps’.
WOW!!!
Nelson, you are unbelievable! How can you make something this easy to build sound sooo good??? Thanks as always for being awesome!!!
This thing sounds unbelievably good! Since everything is included, it took less than 3 hours to build and another hour to allow it to warm up and bias.
Jim, thanks for your recommendation for mounting the Mosfets to the heatsinks. It worked perfectly.
The fact that there's no need for a chassis is fantastic! Figuring out and paying for a chassis has always been a major albatross for my builds so it's great that this unit is self contained. I look forward to many hours of enjoyment.
🙂🙂🙂
Nelson, you are unbelievable! How can you make something this easy to build sound sooo good??? Thanks as always for being awesome!!!
This thing sounds unbelievably good! Since everything is included, it took less than 3 hours to build and another hour to allow it to warm up and bias.
Jim, thanks for your recommendation for mounting the Mosfets to the heatsinks. It worked perfectly.
The fact that there's no need for a chassis is fantastic! Figuring out and paying for a chassis has always been a major albatross for my builds so it's great that this unit is self contained. I look forward to many hours of enjoyment.
🙂🙂🙂
Well done guys, this unit looks so cute and being chassis less is indeed a plus enabling lot of things (starting with leaving it like that)
How does it sound in comparison to other amps you have? What do you drive with it?
Many thanks for all this and again congrats!
Claude
How does it sound in comparison to other amps you have? What do you drive with it?
Many thanks for all this and again congrats!
Claude
They remind that I can get by with five watts for 95% of my listening. I’m driving 88-89db efficient Spendor 3/1’s, so not necessarily efficient either.
Definitely doesn’t sound like a ‘toy’ amp - I bet if I were blind testing at modest volumes with my other amps, I’d struggle to tell apart. The only real tell is a lack of deep bass, but that’s a tall order for five watts, at least with my speakers.
Definitely doesn’t sound like a ‘toy’ amp - I bet if I were blind testing at modest volumes with my other amps, I’d struggle to tell apart. The only real tell is a lack of deep bass, but that’s a tall order for five watts, at least with my speakers.
They shipped with 6 ma idss. For less they might need a larger value on the pot.
If you use more than 7 ma I recommend bridging the wiper and cw pins on the pot to keep the Vds of the jfets at an adequate voltage. The idss limit on the jfets would be that of dissipation, but there is little advantage to the higher values.
I just validated my BOM vs parts, and it looks good.
If anyone cares, there is an extra 1000 uF 25V cap in the bag, and the jumpers were in the bag, but not on the BOM.
If anyone cares, there is an extra 1000 uF 25V cap in the bag, and the jumpers were in the bag, but not on the BOM.
Thoughts?
I will likely build the amp over the next week. The most efficient speakers I have are MartinLogan LX16 bookshelves (92 dB). Any thoughts on how they will sound/work with the ACA Mini? I always listen at pretty low volume.
I will likely build the amp over the next week. The most efficient speakers I have are MartinLogan LX16 bookshelves (92 dB). Any thoughts on how they will sound/work with the ACA Mini? I always listen at pretty low volume.
gonna be real bad, real bad. It may break speakers, too. Send this one to me instead 😉
Listening impressions
I'm thinking that this is probably the best first amp project for anyone considering diy electronics. It is so easy that anyone who can solder should have no problem achieving fantastic results. What's even better than the ease of construction is that the resulting amp is anything but simple. The end result is a detailed amp with a holographic sound stage.
I've spent the day listening to it on fairly inefficient SEAS full range drivers mounted in foam core boxes. The amp's performance punches well above it's weight class. Morcheeba, Air, Koop, Gov't Mule, Leo Kottke, Mississippi John Hurt and more have provided a day filled with audio enjoyment!
If you've been tempted to dip your toe into the diy waters, this is the project for you!
The only thing I chose to "modify" was installing a blue LED. Red just didn't feel right to me for a Pass amp and I had some Cree LEDs laying around. I did however use the red LED for my 6-24 biamp crossover and it is really nice! 😀
I'm thinking that this is probably the best first amp project for anyone considering diy electronics. It is so easy that anyone who can solder should have no problem achieving fantastic results. What's even better than the ease of construction is that the resulting amp is anything but simple. The end result is a detailed amp with a holographic sound stage.
I've spent the day listening to it on fairly inefficient SEAS full range drivers mounted in foam core boxes. The amp's performance punches well above it's weight class. Morcheeba, Air, Koop, Gov't Mule, Leo Kottke, Mississippi John Hurt and more have provided a day filled with audio enjoyment!
If you've been tempted to dip your toe into the diy waters, this is the project for you!
The only thing I chose to "modify" was installing a blue LED. Red just didn't feel right to me for a Pass amp and I had some Cree LEDs laying around. I did however use the red LED for my 6-24 biamp crossover and it is really nice! 😀
This is all fine and dandy but....any idea when they'll be in the store? Would make nice x-mas presents...to myself lol.
how does "ACA mini" providing 5w of power with such small heat sinks where as older ACA needs lot bigger heat sinks for same 5w of output power, and both being class A amps?