Pictures and circuits of my DIY class D and other projects.

[zilog]

luka, Epcos RM10 N87

How high output power do you use this core for? I feel uncomfortable going past 12-13A peak output current with a 1mm+ gapped RM12 3F3 core in my UcD as past this point you get too close to saturation and distortion rises fast.

 

[classd_fromru]

zilog,

To mine, in the UcD400 used RM10 cores. I think with RM10 output current may be nearby 15A or even above, its quite enough for me. I make gap is about 1.8mm.

 

[luka]

Hi

At what freq. does the filter start to cut off.
How do you increase your air gap and what size of wire did you use?

 

[classd_fromru]

Hi!
I not calculated cut-off frequency of a output filter. The gap selected by practical consideration that inductance of a throttle was 30 mkH.

I tried to lead measurements with IRF540Z, total distortions about 0.08 but 2nd harmonic as in original UcD amplifiers prevails. 🙂

 

[classd_fromru]

Final version

Hi all!
I finished to build my discrete UcD . 😎
Fosc = 330kHz
Distortion is not very good, but i want to try reduce Fosc to 60-100k (for sub amp). I think i doing it in next few days. 🙄
Photos, PCB, and measurements here:

http://www.classd.fromru.com/circuits/ucd5.html

An externally hosted image should be here but it was not working when we last tested it.

 

[luka]

WoW

Nice to see how it finally loks like. How much did your PCB's cost?

 

[classd_fromru]

luka,
3$ - 100x100mm
preparing of produce about 50$

 

[luka]

So its 50 $ to prepare everything then every PCB is 3$, right?

 

[classd_fromru]

yes, 50$ for all and aprox 2.5$ each pcb because size is 88x74. 3$ its for 100x100mm.

 

[luka]

Ok thanks

How much do you plan to build?

I alsoa re looking forward to your chip, D-amp

 

[classd_fromru]

luka,

I plan to build about 15-20 devices. For Home, for country, for the car of the future... 🙂

 

[IVX]

luka,

I plan to build about 15-20 devices. For Home, for country, for the car of the future... 🙂

Impressive plans! What about a mankind entire, and for other galaxies?🙂

 

[classd_fromru]

Hi Ivan,

I mean, that I shall make the amps for the my house in village, instead of for all Russia 😀

 

[luka]

Wise choise, or i'm coming to Russia too 😀

 

[zilog]

Here are some pictures of my ongoing project:

http://wintermute.csbnet.se/~zilog/PICT0154.JPG
http://wintermute.csbnet.se/~zilog/PICT0156.JPG
http://wintermute.csbnet.se/~zilog/PICT0159.JPG

 

[classd_fromru]

welcome zilog!

Looking good! Very much reminds the original UcD180 😀 .
What soft used for drawing pcb? What supply voltage will be used? Necessarily inform on the further promotion of works! 🙂

 

[RX5]

Here are some pictures of my ongoing project:

http://wintermute.csbnet.se/~zilog/PICT0154.JPG
http://wintermute.csbnet.se/~zilog/PICT0156.JPG
http://wintermute.csbnet.se/~zilog/PICT0159.JPG

zilog,

nicely done.. how much for the kit??


😀 😀 😀

 

[zilog]

Supply voltages are +-45V, power rating is ~200W@ 4ohm. Hopefully it works, but probably it wont 😉

If you can guarantee that Bruno lets me live, I will sell you some PCBs 🙂

 

[RX5]

Supply voltages are +-45V, power rating is ~200W@ 4ohm. Hopefully it works, but probably it wont 😉

If you can guarantee that Bruno lets me live, I will sell you some PCBs 🙂

nah.. juzt kidding 😀

anyways, I can SEE in your pics a 14pin chip pad... so I guess you got your overcurrent protection scheme running ....

op-amp buffer you used??

 

[classd_fromru]

zilog,
I have understood thanks 🙂 . I tried to connect the amplifier to +-47v with IRF540z and this fets was destroyed for pumping effect 🙁 i think so... irfb23n15 works fine 😎 235W@2ohm supply voltage with this load was reduced from 46 to 31v per rail. Little question. Why on 2-side pcb crosspieces from wires are used? 😀