Why not, I'll take a stereo set too, thanks... too lazy to read now.. don't know if the boards are mono or not...
Pavel's stuff I'd take anyday.
Pavel's stuff I'd take anyday.
Thanks for the manual, what's up with that resistor array on the outputs, or is it simply a dissipation thing?
I'm sorry guys for my late answer : at last was price 50dollars/each - board is ccca 2 dm sqr and 70 microns copper, with all proprieties. I know, it is not cheap, but all is official, tax is tax and I'm not charity. Be patient, I searching for cheaper manufacturer...
man I want one badly, but $50 is more than I can afford and still look my wife in the face... Hope you manage to find cheaper fabrication.
Look no further!
A group buy is started. 🙂
http://www.diyaudio.com/forums/showthread.php?s=&threadid=98421
A group buy is started. 🙂
http://www.diyaudio.com/forums/showthread.php?s=&threadid=98421
To slip off topic briefly... I'd like to know if anyone knows where I could get SPICE models for these units( LM4780, LM3886 ). I have searched this site and about everywhere on the internet. I would have thought that National would have them on thier site, but I can't find any. Any help would be appreciated.
I'm pretty sure google won't be much help here... The only lm3886 "model" I'm aware of is Gerry's. See:
http://www.diyaudio.com/forums/showthread.php?postid=1090917#post1090917
http://www.diyaudio.com/forums/showthread.php?postid=1090917#post1090917
Hi.
peranders: First hit on google points me to this forum, to a model that does not work. Nothing else on Google.
teemuk: Thanks for the link, but that model is not working properly.
I tried to create the model myself with Multisim, but there are some parameters that I cannot find. National should provide a model.
peranders: First hit on google points me to this forum, to a model that does not work. Nothing else on Google.
teemuk: Thanks for the link, but that model is not working properly.
I tried to create the model myself with Multisim, but there are some parameters that I cannot find. National should provide a model.
Just curious: Do you have any special circuit that you want to simulate, if not the gathered expertise may help you.
peranders:
I have been tinkering with audio devises for thirty years, but recently ( 2 years ago ) have become more serious about it. I have built several amps over the last 2 years, but they have always been someone elses design. Now I do not claim to have the depth of knowledge and understanding to design a great amplifier from scratch, but like I said - I like to tinker.
I have a software program that lets me develope a circuit from the ground up, using a component database. Missing from the database are some components such as the LM4780 etc. If I could find a spice model, I could design around the devise, run a simulation that gives real world results. I could then build it and be more satisfied knowing it is uniquely mine.
My education is ongoing and I am having lots of fun.
Perhaps there is someone out there with access to more detailed specs for these chipamps, I'd appreciate any help.
I have been tinkering with audio devises for thirty years, but recently ( 2 years ago ) have become more serious about it. I have built several amps over the last 2 years, but they have always been someone elses design. Now I do not claim to have the depth of knowledge and understanding to design a great amplifier from scratch, but like I said - I like to tinker.
I have a software program that lets me develope a circuit from the ground up, using a component database. Missing from the database are some components such as the LM4780 etc. If I could find a spice model, I could design around the devise, run a simulation that gives real world results. I could then build it and be more satisfied knowing it is uniquely mine.
My education is ongoing and I am having lots of fun.
Perhaps there is someone out there with access to more detailed specs for these chipamps, I'd appreciate any help.