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Old 9th October 2007, 06:48 PM   #11
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Hi,

Hey luka where were you! I started to miss you, because u are a very helpful DIYer.

Any way, to day I did my small UCD . It works at 370Khz on idle. All the components are SMT except the IRFP250Ns. Here is the tested channel's photo. Other will be tested soon. It is an easy and cheap amp. Some times it is very hard to find some special components, therefore I could not decide to put which one to my car. HIP4081 amp will wait for other four channel for my home theatre and UCD will go in to my sub's box. I am planning to add four fullrange channels to this one and certainly will add some protection circuits.

If a diyer interested I can post the PCB files and shematic of this amp. I tested this with single ended input but, one can put differantial inputs to it.

Regards

PS. sorry for the low resolution, my KODAK's charger broken and waits for me to repair it .
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Old 9th October 2007, 06:50 PM   #12
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here is the upper side.
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Old 9th October 2007, 07:05 PM   #13
luka is offline luka  Slovenia
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Hi

I have some problems with my ISP, I am going to FTTH from VDSL so I am currently still without internet, but I have found one wireless network that has connection to internet so for the moment I have free net .

Now back to subject, glad to hear that I am helpfull to someone, THANKS

Amp looks very good, nice and small. I like it
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Old 10th October 2007, 06:27 PM   #14
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Hi, Luka

Please excuse me, could not write. I understand the situation and get sadden.

I gaveup the discrete input modulator for mosfet driver ICs project. Although, sound qualities better to my ears, simulation results show some distorsions because of longer dead times. Also here I need to define the topology (it is out of my knowledge). In principle it works like a sigma-delta modulator but, infact I do not know .

UCD is an easy and cheap amplifier and not requiers special components. I recently did through hole version of UCD. It was good. But, the simplicity of the amplifier force me to search more complex class-D amps. I realised now the simple UCD is the solution of my car Class-D amplifier project.

Any way the circuit works very good and a pretty amp.

Regards
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Old 10th October 2007, 08:24 PM   #15
luka is offline luka  Slovenia
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Hi

If it is sigma-delta works like so: positive input signal, upper fet is forking only, negative input, bottom fet is working.

If yours work like that then you know what you got. Sigma-delta has three-level modulation, normal class D has only two-level
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