Thank you for your reply. Do you mean to change the sampling resistance 0.22 to 0.33 to reduce some gain
Well, what you said is quite reasonable. I will modify this gain in the actual circuit. thank you
Beware that distortion is often not included in the device model for an IC, so the results can be overly optimistic. I'd check the model file to see if distortion is modelled before using the results for much more than a "is this broken?" types of investigation.
Tom
Tom
Can I use a simple SMPS power supply for the LM1875 and minus of the power supply is the common ground?
o.k. I found this here on diy audio I will study that
try these 8 threads. Should answer most of your questions....
http://www.diyaudio.com/forums/showthread.php?s=&threadid=74310&highlight
http://www.diyaudio.com/forums/showthread.php?s=&threadid=73479&highlight=
http://www.diyaudio.com/forums/showthread.php?s=&threadid=70764&highlight=
http://www.diyaudio.com/forums/showthread.php?s=&threadid=56615&highlight=
http://www.diyaudio.com/forums/showthread.php?s=&threadid=50932&highlight=
http://www.diyaudio.com/forums/showthread.php?s=&threadid=49374&highlight=
http://www.diyaudio.com/forums/showthread.php?s=&threadid=26405&highlight=
http://www.diyaudio.com/forums/showthread.php?s=&threadid=18497&highlight=
try these 8 threads. Should answer most of your questions....
http://www.diyaudio.com/forums/showthread.php?s=&threadid=74310&highlight
http://www.diyaudio.com/forums/showthread.php?s=&threadid=73479&highlight=
http://www.diyaudio.com/forums/showthread.php?s=&threadid=70764&highlight=
http://www.diyaudio.com/forums/showthread.php?s=&threadid=56615&highlight=
http://www.diyaudio.com/forums/showthread.php?s=&threadid=50932&highlight=
http://www.diyaudio.com/forums/showthread.php?s=&threadid=49374&highlight=
http://www.diyaudio.com/forums/showthread.php?s=&threadid=26405&highlight=
http://www.diyaudio.com/forums/showthread.php?s=&threadid=18497&highlight=
Thank you for your reply.
I found that this circuit may have poor control over the horn. High output impedance, low damping coefficient
Current output (current derived feedback) is by definition high output impedance/low DF output.
Yes I need exactly that as I only use DIY fullrange drivers - one way only - for the complete audio spectrum. These drivers profit from current drive with lower distortion and problems arising from the voice coil can be compensated. Lm1875 is an available chip amp. So I am very interested how to make it work, how to connect it to a power supply, maybe smps if possible as I do not like to buy transformers. Laptop smps are cheap to get. As I am not into electronics I need some tip how to wire all up.
Two smps will work if they are isolated from mains.
Im675 for "virtual ground" seems like waste of energy and op-amps ... You could instead try using two lm1875 in BTL (bridge) mode - not sure how the current drive would have to be done, however...
They will NOT work.
To boot, the left bottom one shows NO power ransformer, so is forbidden per forum rules
The fake ground on the right is poorly/wrong drawn and to boot even nif it works it
can only provide a few MA (think a simple preamp), never ever a power amp.
Do the things the right way or stop and do them when you can.