I bought one 2.5mm ID x 5.5mm OD that works fine with the newer DC inlets that come with the kit. I think the older and newer inlets are the same size though.
If you are planning for a laptop charger as psu, an Asus laptop/Chromebox charger will fit right in.
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My friend gave me a toroidal transformer. The specs are Pri: 0-230V 50/60Hz. Sec.: 2x 0-25V (2.4A), 120VA.
Can I use this into ACA? 25v seems to be a bit high but I am not expert into this, so maybe I can need to add extra something to lower down the voltage.
For PSU, I had gone thru this post that someone using 13v/14v transformer. I'm really not sure 25v is possible or not.
Can I use this into ACA? 25v seems to be a bit high but I am not expert into this, so maybe I can need to add extra something to lower down the voltage.
For PSU, I had gone thru this post that someone using 13v/14v transformer. I'm really not sure 25v is possible or not.
hi moppy,
A linear supply would give you 35.35V. That's a bit too much for the K170 and you would need much bigger sinks...
but, you can use a single mosfet regulator as seen here->
>>http://www.firstwatt.com/pdf/art_zv5.pdf<<
on page 7 is a bipolar powersupply. take the upper part, skip the coil and you get some smooth 30something volt or less depending on the zener.
its all in the article!
cheers
A.
A linear supply would give you 35.35V. That's a bit too much for the K170 and you would need much bigger sinks...
but, you can use a single mosfet regulator as seen here->
>>http://www.firstwatt.com/pdf/art_zv5.pdf<<
on page 7 is a bipolar powersupply. take the upper part, skip the coil and you get some smooth 30something volt or less depending on the zener.
its all in the article!
cheers
A.
If you use wires you may want to put the gate resistors (R5/R6) directly on the IRFP240 mosfets, rather than at the PCB side.
Perhaps others can comment it this is necessary.
Dennis
After a long time I finally managed time to build a linear psu for my beloved AmpCamp.
No load dc voltage : 22vdc
On load dc voltage : 18.7v
Trafo used : 15-0-15 120va
PSU : C-R-C (24000uf - 0.33R - 24000uf)
Only one psu is driving both the channels as of now.
Here are the photos:
Haven't done any critical listening so far. Will compare lpsu vs laptop brick psu performance next week.
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No load dc voltage : 22vdc
On load dc voltage : 18.7v
Trafo used : 15-0-15 120va
PSU : C-R-C (24000uf - 0.33R - 24000uf)
Only one psu is driving both the channels as of now.
Here are the photos:
Haven't done any critical listening so far. Will compare lpsu vs laptop brick psu performance next week.
Sent from a handheld device. Some typos may creep in
I've used 15-0-15vac 120va toroidal transformer for this linear psu. It's working flawlessly. I think you might go upto 16vac trafo as well for approx 19vdc operation.
25vac will translate to 35vdc after rectification. This might fry the input jfets - 2sk170.
I think the dc voltage should not exceed 25vdc.
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Last edited:
Hi all, I've just been reading about changing the value of the output cap to suit the output frequency. What advantage does this have? At the moment I have a pair of ACA's driving my mid horns, 350hz and up (16ohm). Is it worth playing around with the output cap?
I'd also like to use another pair to drive my tweeters but need some help with designing input filters, can anyone help me with these?
Thanks Dave
I'd also like to use another pair to drive my tweeters but need some help with designing input filters, can anyone help me with these?
Thanks Dave
Start reading here: http://www.diyaudio.com/forums/pass-labs/215392-amp-camp-amp-aca-300.html#post4890079
Best,
Anand.
Thanks for that...so does this form a filter on the output or just a matter of using the smallest cap but still keeping dc blocking.
Can I also us the input Cap as part of my crossover filter? At the moment I have a rc filter on the input to my Amps to form the crossover.
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Can I also us the input Cap as part of my crossover filter? At the moment I have a rc filter on the input to my Amps to form the crossover.
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From my understanding of what you have written above, your amps are already frequency limited on the low end to about 350 Hz or so (at the amps input). So then changing the value of the output cap should provide you no benefits (from a bandwidth standpoint) although if you are able to use a smaller value output cap, you could possibly use a film cap which can provide you a more transparent midrange and top end (vs. a large valued electrolytic).
Experiment & let us know. All the math is laid out in my previous post.
Best,
Anand.
Experiment & let us know. All the math is laid out in my previous post.
Best,
Anand.
I believe this would be sufficient. You'd be able to add two C-R-C PSUs with this.
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Thanks. I will try. I have totally no experience into electronics, so I am going slow.
What is the minimum capacitance suggest for this?
In typical Papa PSUs, 60000uf or more per rail is recommended I guess. As theose PSUs are targeted for amps with higher Watts and AmpCamp is a bit less demanding, I went ahead with 48000uf in C-R-C configuration. 24000uf-0.33r-24000uf. Results are nice. However, more uf won't hurt, but in that case you might have to keep the esr in mind as well. So smaller valued multiple caps are preferred over a large one.
I'm novice too. Learning slowly.
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