Destroyer x Amplifier...Dx amp...my amplifier
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 27th April 2007, 11:29 AM #1041 richie00boy   Did it Himself diyAudio Member     Join Date: Nov 2003 Location: Gloucestershire, England, UK Thanks Greg, that's cleared everything up now. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, modules and more.
 27th April 2007, 02:08 PM #1042 BillH   diyAudio Member     Join Date: Mar 2005 Location: Wisconsin Thanks to all for the help with the spade terminals. They're shown on Mouser's page 1217. Hi Carlos, thanks for the parts substitutions and I'll get the dimensions you asked for when I get home tonight. The transformer may be the limiting factor. It had 1.6A fuses on the + and - DC rails. When it was operating in the receiver, it was putting out + and - 42 vdc at idle. Feel free to correct my maths, Mr. Ohm's law of P=I^2*R gives me 1.6^2*8 or about 20 watts into 8 ohms just before the fuses blow.
 27th April 2007, 02:35 PM #1043 kvholio   diyAudio Member     Join Date: Jul 2005 Location: leeuwarden BillH, the formula you use would apply to a speaker-protection fuse, assuming a constant signal at the output of the amplifier and an 8 ohms resistive load. Assuming a 10% voltage-drop of the transformer at full power, the maximum continuous power the transformer delivers at the amplifier-circuit is 1.6 * 38 * 2 = 121,6 watts before blowing fuses. But in practice you don't play continuous sinewaves, also those fuses will not blow at 1.61 A current-draw It gives you a ballpark-value of the va-rating of the transformer imo. Best regards, Klaas
 27th April 2007, 02:59 PM #1044 destroyer X   diyAudio Member     Join Date: Feb 2004 Location: Recife - Brasil Northeast The Dx amplifier will need around 2.3A to each rail...and for a single channel Also considering losses...your DC supply will go down to 36 volts. Under that condition, the supply fuses, feeding only one channel, had to be 2.5A each rail Using a single supply for 2 Dx amplifiers, the rail fuses installed into the supply output, had to be 5A each one of them. Your supply will be enougth to only a channel. Better to find another second transformer, as this one will be enougth to a single channel...and even for a single channel it will be not perfect. regards, Carlos .................................................. .................................................. ... Thanks Klaas...i had a little different numbers, but your idea is fine too....mine was a little more abusive to the transformer. BillH has transformer, and also output transistors, and those parts will fit only one channel. And this makes sense to fast evaluation..Dx amplifier will produce twice the power...so.... that small transformer will hold a half of Dx amplifier.....so....not a stereo..only a single board. regards, Carlos __________________ Restriction removed ;https://www.youtube.com/watch?v=3ioyOjAzDt0; https://www.youtube.com/watch?v=uFcnddpe3MU
BillH
diyAudio Member

Join Date: Mar 2005
Location: Wisconsin
Here are some heat sink and transformer dimensions. The metric dimensions [mm] are in brackets with inches below. It has been a long day, I need some sleep. I'll be able to think better tomorrow.
Attached Images
 sinkandtrans.jpg (39.5 KB, 491 views)

 28th April 2007, 05:28 AM #1046 PhongVuTuan   diyAudio Member   Join Date: Jun 2005 Location: Hanoi Re. amp amp Yep, DestroyerX, I have seen your post criticizing my amp. In this instance you are right. But my amp didn't get burned like amazon forest but it distort at high volume. I'm going around in search of a scheme to provide more base current for my exhausting outputs. regard,
 28th April 2007, 10:32 AM #1048 Graham Maynard   R.I.P.     Join Date: Dec 2003 Location: UK Hi Carlos, Two of your amplifiers with extra output devices could be bridge connected. Say 2x 250W to give a 500W chassis, this with 70Vrms line output capable of driving very many line loudspeakers in a large building. Cheers ......... Graham. __________________ http://www.gmweb1.net/ and http://www.gmweb2.net/
 28th April 2007, 11:01 AM #1049 Nordic   diyAudio Member     Join Date: Sep 2005 bought 10R 10W resistors and crocodile clips... off for eyetest now... but the weekend is still long.
 28th April 2007, 11:04 AM #1050 destroyer X   diyAudio Member     Join Date: Feb 2004 Location: Recife - Brasil Northeast Yes..... will be interesting, the Thunderstorm X Inspired into the crazy scientist.... already passed...dead, Ludwig Von Melter. Do you want to make this one dear Graham? To adapt Dx amplifier in such a way? Your cooperation will be received as a party here. The new monster, the melter...Thunderstorm X..the voice coils assassine... it is serious..wanna make it Graham?.... to 1 ohm voice coil..hehe...nice that! Phong will burn Hanoi city wires and transformers. I have made a simulation, and 2 Kw was not difficult over 2 ohms...a lot of transistors, bridged and enormous power transformers. regards, ahahahha Carlos __________________ Restriction removed ;https://www.youtube.com/watch?v=3ioyOjAzDt0; https://www.youtube.com/watch?v=uFcnddpe3MU

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