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Old 8th November 2010, 03:00 PM   #1621
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Quote:
Originally Posted by fotios View Post
Behold a useful "tool" for each DIYer who takes his hobby seriously! A different control unit for preamplifiers and integrated amplifiers!

Here is the full article: welcome to* The Electronic Audio Labs web magazine
Nice work (as usual) Fotios!
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Old 9th November 2010, 11:37 AM   #1622
Bonsai is offline Bonsai  Taiwan
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Very nice project Fotios!
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Old 9th November 2010, 08:01 PM   #1623
fotios is offline fotios  Greece
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Originally Posted by regiregi22 View Post
I have just realized that we would need to have the same 100k log dual pot, but I have just seen too that it has already a 100k alps.
For the pinout I am aware that we may have to isolate all 6 pads and cut the necessary traces, for optimal isolation.

Fotios, the pot is not intended to work directly with the LDR, but with the boards Uriah is offering for the simpler LDR vol. control or for the Lighter note. They need a 100k pot, so adding this external one should do the job.
Yes, you are right regiregi22, i was very hasty reading the related thread. Sorry for this. I don't know how much reliable are those Silonex optocouplers with resistive output (not simple LDRs). Please advice me.
As for the pinout of ALPS mot pot, all pins are separated on the PCB layout of volume control unit. You can download schematics, layout and PCB artwork from my web page.
Thanks for your kind words.
Fotios
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Old 9th November 2010, 08:04 PM   #1624
fotios is offline fotios  Greece
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I congratulate you, dear my friend!

Gyuri
Thanks X 10^6 Gyuri!

Fotios
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Old 9th November 2010, 08:09 PM   #1625
fotios is offline fotios  Greece
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Nice work (as usual) Fotios!
Thanks dudaindc! You are (as usual) very polite!

Fotios
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Old 9th November 2010, 08:20 PM   #1626
fotios is offline fotios  Greece
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Originally Posted by Bonsai View Post
Very nice project Fotios!
Many thanks Bonsai. Since you are professional, with big experience in electronics design, your opinion is always of big importance to me.

Fotios
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Old 9th November 2010, 08:33 PM   #1627
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Now I have been able to finish your article. Very detailed instructions you have written, all I may ask is if you are willing to provide some PCBs for this design. It seems that taking my time can reach to succesfully finish a project like that. I haven't neither written never any code for an IC.

kind regards,
Regi
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Old 11th November 2010, 10:44 AM   #1628
fotios is offline fotios  Greece
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Quote:
Originally Posted by regiregi22 View Post
Now I have been able to finish your article. Very detailed instructions you have written, all I may ask is if you are willing to provide some PCBs for this design. It seems that taking my time can reach to succesfully finish a project like that. I haven't neither written never any code for an IC.

kind regards,
Regi
Hi regiregi22
Sorry for the delayed reply, just today i had the time to look at these projects with opto-resistors. Since the led is isolated from ldr inside Silonex, the job can be done directly from the microcontroller with the aid of an external quad comparator (e.g. LM324). There is no need of using motor pots, trimmers etc. We need just one output of MCU to produce a PWM, and 4 to work as RAMP generators. By modulating the pulse width, we can obtain the desired voltage variation in the output of the four comparators. If we have 4 Silonex opto-resistors connected at the outputs of comparators, we can match them very easy by changing the width (period) of each RAMP thru the software of MCU. That is simply an idea and nothing more.
As for PCBs, of course i have my supplier, simply i must place an order for 30 boards at least, to drop down the cost in 12 euro / piece.

Fotios
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Old 12th November 2010, 07:00 PM   #1629
shaan is offline shaan  India
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Default First try on LatFET and CPU HS

First time making a Lateral FET SE Class-A amp and also first time using a CPU heatsink. Dissipating about 90watts the heatsink seems ok for this monoblock. Plan to make another one like this soon for a stereo setup. The circuit is a combination of Zen and Death of Zen using an N channel FET for the power device and a PNP power darlington as the nonmodulated constant current source. The heatsink is probably an AMD one. Had to cut four of the radiator fins for the mounting bolts.
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Last edited by shaan; 12th November 2010 at 07:05 PM. Reason: added heatsink fin cutting info.
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Old 12th November 2010, 07:14 PM   #1630
tinitus is offline tinitus  Europe
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hey, that reminds me, how about using a two stroke moped cylinder
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