Okay, guess I "couldn't see the forest for the trees".
You're selecting what I consider to be the height of the heatsink from the drop down menu, but they're referring to it as length.
$21 plus shipping sounds reasonable for a pair of nice sinks.
You're selecting what I consider to be the height of the heatsink from the drop down menu, but they're referring to it as length.
$21 plus shipping sounds reasonable for a pair of nice sinks.
Hallo Jay and camelator.
I have read to late your comment, jay.
My experience with MKP is, if you find a good choice there have a fuller tone mostly combined with dark, silence background.
I agree other give thin, like more transparency tone.
Camelator you have in use/tested russian caps, like KU40, 42, 75-10, MBGO, MBGCH?
Regards Bangla.
Yes, can be confusing.
The heatsinks are extruded in long lengths.
We order up short lengths cut from the long extrusion.
Then we mount them so that the fins stand up and call that the height.
Width is easy. It's always width.
Now for the depth?
That's all about water !
No it's the thickness of the backplate plus the length of the fins and we call that depth. Odd language this english.
Unfortunately,no
Actually I am not sure I need a capacitor here
I am not sure I have DC voltage on the audio signal
Well.... Anyway I have to wait for my PCB and build the amplifier 🙂
If you need a heatsink for most 100w amp projects in this thread, these are the ones I have been using. They work very well and dissipate heat nicely. $10 for two and have free shipping. I have 8 of these and would use them for everything except some amps have transistors spread wider than the 150mm width can accommodate. Add a small 12v (with qnty 4 x 220R resistors paralleled and in series with positive) and you can cool much larger class A or hot class AB heat loads without fan noise.
Online Shop (Special offer) High quality 150x60x25mm radiator Aluminum heatsink Extruded profile heat sink for Electronic heat dissipation|Aliexpress Mobile
Making progress with my next PSU. Running some simulations on it for a CRCLC. Adding some Dx style filters right after the bridge to filter the diode switching noise. Those are hand rolled inductors 18ga (ferrite core) coming in at about 0.5mH. This whole point to point is kind fun for PSU's - certainly more compact than a PCB.
Attachments
Any schematic?....can you post picture of makeing...how gnd and lines are connected.? Thank you.
This PSU uses filter elements similar to the Dx PSU, but I changed it to a 3-bank CRCLC type filter.
The diodes I am using are labeled 10A10 (big fat leads).
Attachments
The new PSU works well. With amp connected but no music ripple for 35v is 5mV. It was 36mV with last supply.
Hi XRK, very nice and compact build.... how did you measure the ripple? with DMM or scope? any improvement in SQ with your amps that you built?
reg
Prasi
xrk971
Used that way, those inductors are useless - they have ferrite core without a gap, so when a DC current flows through the windings the core gets saturated and the inductance falls down almost to zero. You need the air core inductors or ferrite core with a gap.
Used that way, those inductors are useless - they have ferrite core without a gap, so when a DC current flows through the windings the core gets saturated and the inductance falls down almost to zero. You need the air core inductors or ferrite core with a gap.
Doesn't it depend on the saturation current of the particular choke assembly? The material makes a difference - like amorphous nanocrystalline toroids specially designed for 60Hz power supplies? I have those on order and using this for now. But if a choke saturates at say 10amps and I am using it circa 5amps, does saturation still occur always? When does the amp use 5amps DC? That would be a huge transient and the hum blocking doesn't matter anyway.
Check out some of the advanced core materials from CWS.
CWS Coil Winding Specialist, manufacturer of transformers, inductors, coils and chokes
Check out some of the advanced core materials from CWS.
CWS Coil Winding Specialist, manufacturer of transformers, inductors, coils and chokes
Thanks for the complement. 🙂 It looks like a spacecraft from Star Wars. The diode bridge is soldered in a square frame block and sits on the back.
Ahh... I kick myself for selling my analog scope 6 years ago before I got into DIY. This was measured with Fluke 101 in ACV mode.
I noticed a subjective (audible) improvement with reduced low level 60hz hum. Placing my ear against the woofer - I can barely hear hum. Before I could hear it slightly (not terrible by any means). This makes sense as 5mV is much less than 60mV (-20.5dB improvement - my previous post said ripple was 36mV was a mistake, it was 60mV). The rest of the music frequencies are not any different but perhaps there is an improvement in fine details that give better imaging.
I am glad I tried making the PSU as a P2P though as I am looking for a compact format to place in a rather small enclosure with the already very compact stereo FX8 50mm edition.
I tested this new PSU with my new vHEX amp last night (heatsinks came in) and it also sounds fantastic. No audible hum at all with ear pressed to speaker cone.
http://www.diyaudio.com/forums/soli...-amplifier-simulated-tina-27.html#post4726680
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You can believe what you want, but if you use the scope to look at the ripple voltage before and after the choke in that PSU you'll see there is no difference, i.e. the choke does nothing.
Not saying I don't believe you - you have a valid point and I am looking into it. But as I asked - does saturation current matter or are you saying anytime there is DC, the choke saturates? I think that at lower DC current levels the choke still works.
Of course it's current dependable - there's a lot of reading material on that subject and the phenomena is easy to measure.
Google for permeability, saturation, B/H curve...
Google for permeability, saturation, B/H curve...
