Post your Solid State pics here

[Bonsai]

more

Wow Cecco - what can I say - that is truly a wonderful job. You have inspired me to finish my pre-amp off.

Fantastic.

 

[Bonsai]

I'm more than satisfied with the sound, though my aging ears are now troubled with tinnitus. That's why I "downgraded" from my fancy Rowland gear. But I can say that it has great low-end control over my Thiel CS3.6s (2 ohms!), not a trace of harshness, and a pleasing soundstage.

Look up transitional miller compensation here on DIY; it's also well-explained in Bob Cordell's book. The idea is to derive feedback from the final output for as wide a bandwidth as possible, thus reducing HF distortion (I got a factor of 5 improvement at 20 kHz). In my design, R9 and C4 set a "crossover" at 617 kHz, above which feedback comes from the VAS output. That avoids the extra phase shift in the output stage. It does take a bit of fiddling, and there will always be tradeoffs, but I'm very happy with the results.

-Gary

Wow - that is a wonderful looking amp!

Nice elegant circuit and great execution - wonderful stuff.

 

[Bonsai]

I have not looked around this part of the forum for awhile, but the standard of workmanship has really come up over the ladt year or so - some very good stuff indeed!

 

[Federmann]

federman even though i have to say that this is a pretty neat and clean job and box is really heavy metal made i wonder if cooling is efficient enough

Material is 10 and 20 mm aluminum. In power 2x300W/4Ω temperature is less than 70 ° C. The Case is black, then the temperature will be lower. In front of the room for preamplifier.

 

[Mooly]

Material is 10 and 20 mm aluminum....

Very nice job indeed... impeccable layout.

Bonsai... I agree. The standard of some of the builds on here are outstanding.

 

[Upupa Epops]

With the transformer, which you declared at your pages ( from DPA 380 ) you can't get the output power 2x300W, Federmann...and norm for the consumer electronic says, that any part touchable by finger, can't have the temperature higher than 60°C... personally I really doubt that this case can cool this output power down...enthusiastic voices of yours, gentlemen, aren't right...

 

[Federmann]

You are right DPA380 is overheated, and turn off, as it is written here http://i.imagefra.me/2e4igrg5.jpg My HQQF but treads perfectly.

 

[Upupa Epops]

I'm not talking about 380, Federmann...read again...

 

[Federmann]

But I can read about DPA380, after several minutes of loud traffic overheats and shuts down. Transformer very noisy, etc.

My transformer is not noisy, my amp can withstand continuous operation loud.

 

[Upupa Epops]

Yes Federmann...it was in early ninetieth...and maybe hence this amp have here so much people, probably they likes this overheating...

 

[Federmann]

Know you say to Slovanet that 2x300W amplifier must have a consumption of 850W! My middle current consumption is 0.5 A! (230Volt).

 

[Upupa Epops]

Amazing, Federmann...by output power 2x300W you have consumption only 115VA...run quickly to the patent office...

 

[ostripper]

Measure electricity consumption, please! Consumption of electricity (RMS), while listening to music, is always much smaller than the maximum amplifier power (PEAK)!

Cool Edit Download Cool Edit Pro is a program that helps you calculate PEAK, RMS and DYNAMIC RANGE!

Go green ! for 115Va just use 1 pair IRF's Just kidding .... get yourself some big heatsinks , other wise ... nice build.

OS

 

[Federmann]

Measure electricity consumption, please! Consumption of electricity (RMS), while listening to music, is always much smaller than the maximum amplifier power (PEAK)!

Cool Edit Download Cool Edit Pro is a program that helps you calculate PEAK, RMS and DYNAMIC RANGE!

Beautiful day wishes Federmann

 

[AndrewT]

Measure the average consumption of your Microwave or electric cooker or current through the mains distribution board. Let's set the component values to suit this average consumption.

Try switching on the heat !

Same argument, same silly logic.

That cannot be the way designers design electrical equipment.

 

[tinitus]

please remember this is picture thread, mainly


moderation

 

[Federmann]

 

[regiregi22]

At a first sight I can only think..... so many MOSFETS for that few heatsinking!

 

[east electronics]

death of zen ...under construction

 

[FastEddy]

Before finishes.

Input type? (balanced or unbalanced?)

Looks might, mighty viral ... How's it sounding?