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Old 24th May 2005, 09:04 PM   #11
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how many wires in the primary and how many turns and wires in the secondary do you have used.
what kind of toroidal?
thanks!
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Old 29th May 2005, 06:13 PM   #12
kpero is offline kpero  Croatia
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I study your SMPS PCB layout and I see you add one tranzistor and some P-CON pin. What's that? I didn's saw that on shematic.

And question about amplifier. Is it possible to use with 2 ohm, or can I make two of this module and bridge it. And what's nominal power for this amplifier?

Thanks
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Old 29th May 2005, 07:01 PM   #13
kpero is offline kpero  Croatia
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A find that P-COM on protection board but still don't know what's that?
And also on protection board is some feedback. Where is that connected
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Old 2nd June 2005, 07:26 PM   #14
Risto80 is offline Risto80  Macedonia
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Post Hello

Hello


First about calculating the number of primary and secondary windings, you must refer to valveaudio site and project of making car amplifier from ESP projects site.

Second. The P-CON pin from SMPS is connected to Protection PCB.I forgot to put P-CON pin on SMPS schematic. P-CON pin is supply voltage for IC PWM TL494. When you turn off the amplifier, it sometimes causes a shock-off noise, there for is necessary to break off the relay and then to keep the power amplifier apart from speaker at the moment when car amp will go off. This is basic function of P-CON pin. Also the TH1-2k2 witch you will put on a heatsink, will prevent of over-hitting the amplifier.

The Feedback pin from Protection PCB is connected to Amplifier pin feedback for feedback the signal witch will get through relay.
The amplifier is Kenwood and I have made it exactly as the originally just separately PCB’s and it can drive 2 ohm speaker.
Max Power Output (4ohm)………………………….. 240Wx1 (at 100Hz)
Rated Power Output (4ohm)………………………....120Wx1 (0.08% THD at 100Hz)
Rated Power Output (2ohm)………………………... 160Wx1 (0.8% THD at 100Hz)
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Old 3rd June 2005, 06:30 AM   #15
fachri is offline fachri  Australia
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Default What about the Power Supply ?

Could you also inform how you get those voltages (15V 40V) from a car battery. Any schematic for the inverter ?

Thanks
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Old 3rd June 2005, 07:09 AM   #16
kpero is offline kpero  Croatia
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There is shematic and pcb attachment on first page. kac-716 smps pcb and shematic. One file is .zip and one is .pdf

Risto

Is this amp heat's a lot with one pair of output transistor? How did you make cooling on amp?
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Old 6th June 2005, 06:33 AM   #17
fachri is offline fachri  Australia
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Yes I have seen all 3 of the schematic/pcb lay out. But none of them shows how to get +/-15V, +/-40 V from a standard car battery. I have also read a toroidal transformer was mentioned earlier in this post. This transformer I believe could be part of the inverter that produces those voltages. Can anybody give me some more informations on this? of which I thank you very much.
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Old 6th June 2005, 12:31 PM   #18
kpero is offline kpero  Croatia
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You don't cache thing?

Here is shematic of smps:

http://www.diyaudio.com/forums/attac...amp=1116957078

and here is pcb layout for smps:

http://www.diyaudio.com/forums/attac...amp=1116957686

Smps -or switch mode power suply is DC-DC converter which convert 12 V car batery voltage to +/ 40V in our case.

+/15 V you get from power amp when you paralel zener diode to input voltage for amp. In this case you can drain max 500 ma from zener.

If you still don't cache thing then you must learn basic of power managment which I can't explain you here
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Old 8th June 2005, 03:30 AM   #19
fachri is offline fachri  Australia
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Hi KPERO;

Thanks for the pictures/info.
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Old 9th June 2005, 11:13 PM   #20
Risto80 is offline Risto80  Macedonia
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Default Hello

Here is a picture of car amp+ preamp.
Attached Images
File Type: jpg amp+preamp 1.jpg (42.8 KB, 5926 views)
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