Ordered 2 more Dell CPU hetpipe-sinks yesterday for B.B. and Mouser order is almost ready to go. I'm not so familiar with collecting needed parts, so took couple of evenings to gather all in shopping cart. Going to use dc-prot/delay's on this one.
I have made couple of drawings about upcoming cases (monos) and I was wondering about fans. I would rather use just one fan per channel, two for stereo intead of four. So will one 200mm x 200mm work even close as effective as 2 x 120mm's, when I'm going to take high quality pair of huge fans?
I had problems with capMx also, Alpha just draws too much Amps, it's not designed for such constant load. It works, but it heats up much more than Alpha with same sized big passive heatsink.
I have made couple of drawings about upcoming cases (monos) and I was wondering about fans. I would rather use just one fan per channel, two for stereo intead of four. So will one 200mm x 200mm work even close as effective as 2 x 120mm's, when I'm going to take high quality pair of huge fans?
I had problems with capMx also, Alpha just draws too much Amps, it's not designed for such constant load. It works, but it heats up much more than Alpha with same sized big passive heatsink.
If anyone knows of a nice simple BJT based cap Mx maybe it will help as voltage drop only 0.6v? I know Allo audio makes BJT one with small voltage drops maybe they work? I have seen them used on MoFo which has quite a large current.
Here is an example of Drpro using my favorite DC step up with an Allo cap multiplier to power a MoFo at 1.7amps. Seems to work in this case.
I have also used the Juma cap Mx on my MoFo at 1.7amps without issue. It was a P2P cap Mx though so maybe there may be an issue with the PCB implementation.
Here is an example of Drpro using my favorite DC step up with an Allo cap multiplier to power a MoFo at 1.7amps. Seems to work in this case.
I have also used the Juma cap Mx on my MoFo at 1.7amps without issue. It was a P2P cap Mx though so maybe there may be an issue with the PCB implementation.
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Allo=Evil, I mean a copy of this dual rail circuit, but single rail 😀
Simplified MrEvil / PMI Capacitance Multiplier
Simplified MrEvil / PMI Capacitance Multiplier
Thanks for that Irrbeo. Looks like Jkeuterman already has a nice board made.
It uses BJTs to control a MOSFET.
It uses BJTs to control a MOSFET.
Actually X I am running this one at around 2.5amps. Per your suggestion the DC-DC step up are on slabs of aluminum.
This amp plus the 40v Aksa-Lender pre is now wife approved and being used in the living room.
Just finished a RPI, Kali, Piano setup using Volumio for music playback. A bit over 6k songs on a small HD.
A very nice combination.
This amp plus the 40v Aksa-Lender pre is now wife approved and being used in the living room.
Just finished a RPI, Kali, Piano setup using Volumio for music playback. A bit over 6k songs on a small HD.
A very nice combination.
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2.5amps is very impressive - what is the voltage drop across the Allo?
Glad that wifey has approved of the whole setup. I bet it sounds fantastic. Nice going with RPi music server. I am lazy and simply succumb to an Amazon Dot appliance feeding some of my amps for domestic non critical listening. It sounds pretty good actually and in Bluetooth mode it’s also very handy.
Glad that wifey has approved of the whole setup. I bet it sounds fantastic. Nice going with RPi music server. I am lazy and simply succumb to an Amazon Dot appliance feeding some of my amps for domestic non critical listening. It sounds pretty good actually and in Bluetooth mode it’s also very handy.
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Not sure X, I would have to pull it apart and measure, so it may be awhile!!
The RPI with Volumio has turned out to be very wife friendly. Just put the app on her phone, so her the workings and how to turn on the gear. Plus the I have a relatively small stack of equipment, speakers are on 24" pedestals, and once I rebuild the .53X Karlson's those will take the place of similar size Polks. Overall a fairly small setup.
Start small and work up to what you really want!!
The RPI with Volumio has turned out to be very wife friendly. Just put the app on her phone, so her the workings and how to turn on the gear. Plus the I have a relatively small stack of equipment, speakers are on 24" pedestals, and once I rebuild the .53X Karlson's those will take the place of similar size Polks. Overall a fairly small setup.
Start small and work up to what you really want!!
My Big MoFo utilizes the Allo CM boards. 2.5A bias and the voltage drop is less than 1V (.6vdc).
I didn’t know they were copied when in purchased them, Irribeo mentioned it a while back and I compared them to the Simplified MrEvil / PMI Capacitance Multiplier and the Allo is pretty much a copy of the positive side of this CapMx.
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Yes, 2.5A is impressive, DrPro, I would assume it could drive a 4R speaker with ease and give you around 30W?
Nice workmanship, like many on this thread, very good skills in the ALPHA quadrant......
Ciao,
Hugh
Nice workmanship, like many on this thread, very good skills in the ALPHA quadrant......
Ciao,
Hugh
Drpro’s amp above is not an Alpha, it’s the MoFo (single MOSFET follower with choke). I think 24v and 2.5amps maybe gives 16w into 8ohms. If he’s driving a mini Karlsonator with dual 3FE25-16 in parallel that would be a very potent combo at 97dB sensitivity.
Oh, sorry Vunce. You guys were both using Allo cap Mx and same square layout I did not even realize.
Almost twins😀
Back to Alpha, my second transformer arrived and I installed the dc protection/delay board to check it out. It’s even easier to install than I thought, it just needs 12vac! Works perfect, about a 3 second delay so none of the dc power up spike hits the speaker.
I’ll have stereo Alpha BB music very soon🙂
Back to Alpha, my second transformer arrived and I installed the dc protection/delay board to check it out. It’s even easier to install than I thought, it just needs 12vac! Works perfect, about a 3 second delay so none of the dc power up spike hits the speaker.
I’ll have stereo Alpha BB music very soon🙂
Yep sometimes square is the best. The extruded product I used came in precut lengths starting with 12", so that's what I used.
The Alpha BB is in the queue of projects at the moment, so it may be a bit.
The Alpha BB is in the queue of projects at the moment, so it may be a bit.
I am busy with the amplifier enclosures, I work on two enclosure the same time. One for the M2 and one for this amplifier.
However, it goes very slow some days I can do nothing someday just a bit because of my health situation. Also, I live in an apartment for every hole drilling I have to go down not to disturb my neighbors. Pictures were made on the balcony.
These will be the Alpha case, it needs a faceplate, bottom etc. I am not sure if I use that stainless for the top, I have second thoughts about.
I will see I have to find a store where they cut material into size.
First I will try 20-0-20VAC transformer if the heatsink can handle more power at summer maybe I will increase the rail voltage.
Maybe until the end of summer, I will finish it.
However, it goes very slow some days I can do nothing someday just a bit because of my health situation. Also, I live in an apartment for every hole drilling I have to go down not to disturb my neighbors. Pictures were made on the balcony.
These will be the Alpha case, it needs a faceplate, bottom etc. I am not sure if I use that stainless for the top, I have second thoughts about.
I will see I have to find a store where they cut material into size.
First I will try 20-0-20VAC transformer if the heatsink can handle more power at summer maybe I will increase the rail voltage.
Maybe until the end of summer, I will finish it.
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Nice work Gaborbela. Looking forward to your Alpha starting up. Those are nice heatsinks. I see a lot of people using that type for the MoFo. Who makes that and are they expensive?
I purchased those a couple years ago from a Canadien eBay seller. They were used as an industrial puck diode cooler. Each cooled 2 of those diodes. The fins are not the smooth type, that increases the surface area. I will lift up with the feet so if it needs I can ad each side a small fan at the center where the two join together.
These are heavy and big heatsinks, I believe these will handle easily the 20W Alpha even at summer, the fan just in case if I will increase the rail voltage, haha... You know how these used to work we always want more power.
These are heavy and big heatsinks, I believe these will handle easily the 20W Alpha even at summer, the fan just in case if I will increase the rail voltage, haha... You know how these used to work we always want more power.