Funny question, Patrick!
I have given my ACA#1s a 4 x 20VAC/custom-wound torroid, being followed by Jasons's CAP-multiplier and resulting in / adjusted it to an operating voltage of about 24VDC.
What else can I tell you?
Best regards - Rudi
I have given my ACA#1s a 4 x 20VAC/custom-wound torroid, being followed by Jasons's CAP-multiplier and resulting in / adjusted it to an operating voltage of about 24VDC.
What else can I tell you?
Best regards - Rudi
Interesting project you can count me in for 2 pairs of pcb's also. Do we need to sign up somewhere?
JamieMcC: sorry, you are too late. All PCBs are already assigned.
I will give you a PM.
Best regards - Rudi_Ratlos
I will give you a PM.
Best regards - Rudi_Ratlos
Too bad I just noticed this thread, I believe no more boards are available. If you do version 2 count me in for 2 PCB.
I really like the idea of having both the ACA and Jason's Cap Multiplier on a single PCB. Nicely done Rudi ! I really like the 75mm height, just perfect for a 2U enclosure.
Would a typical 2U heatsink of 0.425 C/W (300x90x40)mm per channel be OK. Not sure what is the bias value when working the unit at 24Vdc instead of 19Vdc. (Excluding the 2k2 fix)
Thanks,
Eric
I really like the idea of having both the ACA and Jason's Cap Multiplier on a single PCB. Nicely done Rudi ! I really like the 75mm height, just perfect for a 2U enclosure.
Would a typical 2U heatsink of 0.425 C/W (300x90x40)mm per channel be OK. Not sure what is the bias value when working the unit at 24Vdc instead of 19Vdc. (Excluding the 2k2 fix)
Thanks,
Eric
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@ HerrErnie, JamieMcC, mcgillroy, mordikai,
Gentlemen, I have received the ACA-PCBs today and will take your parcels to the post-office this afternoon.
I have attached the BoM for one PCB.
When you order parts, have a careful look at the needed grid ("package") of the parts.
The ACA#1 is described here: http://www.diyaudio.com/forums/diyaudio-com-articles/214808-amp-camp-amp-1-a.html
Jason's Cap Multiplier (in case you will use it) is described here:http://www.diyaudio.com/forums/powe...lified-mrevil-pmi-capacitance-multiplier.html
If you have any questions during your build: post it here or send me a PM.
Best regards - Rudi_Ratlos
Gentlemen, I have received the ACA-PCBs today and will take your parcels to the post-office this afternoon.
I have attached the BoM for one PCB.
When you order parts, have a careful look at the needed grid ("package") of the parts.
The ACA#1 is described here: http://www.diyaudio.com/forums/diyaudio-com-articles/214808-amp-camp-amp-1-a.html
Jason's Cap Multiplier (in case you will use it) is described here:http://www.diyaudio.com/forums/powe...lified-mrevil-pmi-capacitance-multiplier.html
If you have any questions during your build: post it here or send me a PM.
Best regards - Rudi_Ratlos
notized to late the possibility
Hallo Rudi.
That is bad, that in so short time all your excellent ideas based boards are gone.
In last days i have finished a 2,2kR mod ACA with 19V Notebook PSU, so i
registered now the new possible way with higher Rail voltage get more musicality out.
The ACA is really a amazing tiny Amp.
If your nice boards not to get i must go longer, different way.
These project with your friends looks very professionell, like other stuff what you done before, excellent.
Any way you do a new order and sell the boards?
Regards, enjoy listening music Bangla.
Hallo Rudi.
That is bad, that in so short time all your excellent ideas based boards are gone.
In last days i have finished a 2,2kR mod ACA with 19V Notebook PSU, so i
registered now the new possible way with higher Rail voltage get more musicality out.
The ACA is really a amazing tiny Amp.
If your nice boards not to get i must go longer, different way.
These project with your friends looks very professionell, like other stuff what you done before, excellent.
Any way you do a new order and sell the boards?
Regards, enjoy listening music Bangla.
From time to time I am asked, if I have any of my ACA#1-PCBs (as shown in post #34) left.
I do not have.
But I can of course order another 10 PCBs, if there is a demand for them.
Best regards - Rudi_Ratlos
I do not have.
But I can of course order another 10 PCBs, if there is a demand for them.
Best regards - Rudi_Ratlos
Hi Rudi,
I would be interested in a pair of PCB to build a stereo set.
Are you considering offering the "Hard to get parts" ? You mention these previously in post no.39 (not sure)
Thanks,
Eric
I would be interested in a pair of PCB to build a stereo set.
Are you considering offering the "Hard to get parts" ? You mention these previously in post no.39 (not sure)
Thanks,
Eric
Hi,
When using the ACA with Cap Mult, would a single transformer (100VA) with 2 output windings of 20Vac be sufficient for a stereo amp. This is basically 20Vac @ 2.5A / ch.
Planning to run the ACA at 24Vdc without the 2k2 mod, is the bias with 24Vdc around 1A ?
Transformer is the Antek AN-1220.
Thanks,
Eric
When using the ACA with Cap Mult, would a single transformer (100VA) with 2 output windings of 20Vac be sufficient for a stereo amp. This is basically 20Vac @ 2.5A / ch.
Planning to run the ACA at 24Vdc without the 2k2 mod, is the bias with 24Vdc around 1A ?
Transformer is the Antek AN-1220.
Thanks,
Eric
Eric, I do not know the efficiency factor of the Antek AN-1220 transformer.
I myself would order the Antek AS-2220, which is a 200VA/20VAC transformer.
Best regards - Rudi_Ratlos
I myself would order the Antek AS-2220, which is a 200VA/20VAC transformer.
Best regards - Rudi_Ratlos
FS. A pair of pcb boards to build the ACA
http://www.diyaudio.com/forums/swap-meet/292993-fs-pcb-boards-krell-jlh-aca-cap-multi.html
http://www.diyaudio.com/forums/swap-meet/292993-fs-pcb-boards-krell-jlh-aca-cap-multi.html
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