lm1875 gainclone lack speed

[philb]

Here is the PCB ready to be dipped in ferric chloride.

[philb]

please note that i don't have a digital camera and i am actually scanning the pcb. That said here it is all etched.

[carlmart]

Next time I would advise you to use a different technique for your prototypes, instead of a felt pen.

Use translucid tape to cover all the copper, then carbon copy your pcb design onto it. Then use a razor blade or surgeon knife to cut the tape away following your pcb design and exposing the copper.

Then dip it in the acid.

It's quite easy and gets good looking results. It's good for just a few boards, or it will get tiresome.


Carlos

[GringoAudio]

It ain't really a gainclone with a PCB. Try soldering directly to the chip legs. Its easy and follows the Gaincard philosophy of shortest possible signal paths...(not sure I believe that though). But anyway the making of a PCB is a roadblock you do not need with the very few components required in a minimized gainclone. Just solder!
Greg

[philb]

actually i did cut the traces out with an exacto. But then just colored inside the lines. When you say to use tape do you mean leave it on while in the ferric chloride? If that works with the tape on it will be a huge timesaver. Also my pcb's are mirrored, so i must surface mount the components, not a big deal. Thanks for the help.

[philb]

It works, it plays and it's my first amp. It buzzes a little but there is so much info on how to stop that in the forums that it should be a simple fix.

[Igla]

HI !
I would need a little help with TDA7375 chip.I plan to build an amp.
I have the chip and all the parts and the schematic is very simple.
I just dont understan, what to do with stand-by pin.I dont need stand-by function.Can I just leave the pin unconected?
I have read the datasheet but I don't understand if there should be some voltage on that pin to disable stand-by mode or is it just the opposite-apply voltage to enable stand-by function.
Any help would be welcome.
By.
Igla