I`m in the UK. I only asked about the ferrite beads because AMB ships his Mini³ with them. Coincidentally, it might be worthwhile contacting him regarding shipping costs overseas. I`ve had a few things from him (including boards) and he was able to ship them very cheaply, albeit via the...

Does the board price include the ferrite beads ?

Clear as mud ! It seems the `free shipping` refers only to the back-ordered items when a multiple order is made. So, if, like me, your only after 1 item (on back-order) you have to pay $19 postage for a $2 part that could take weeks/months to be despatched. I`ll keep looking.

Just noticed the Wolfson WM8524GEDT is on back-order at Mouser. According to them, backordered items are free delivery to UK, but when I try to buy, it still comes up with a £12 ($19) delivery charge ! Anyone had any experience with this ?

I`ll take two if you can ship to UK.

Thanks for the replies. Could you cast your eyes over this , any errors ? Thanks Attachment 1553

Sorry, I didn`t make this clear. My question relates to the way the channels are used in an A47. It appears that (using two dual opamps) the first side of the first opamp is used as a gain stage, which then feeds into the second side of the first opamp for the buffer stage. As already pointed...

Attachment 1545 The above A47 diag shows a chip per channel design. Would changing the IC1b to IC2a change it to a chip per stage amp ? Also, notwithstanding the `cranckier` aspects of BJT opamps, will they suffice as buffers. I mean, if they were to be used as a buffer, they won`t need the...

EricJ, Would your choice of resistors differ greatly from the final diagram (bottom of page) in Tangents `Working with Cranky Opamps` ? I`d appreciate a little guidance in setting this up in a Cmoy type config. Strangely, my NE5532 gave a DC Offset of <4mV when using the standard Cmoy...

Many thanks for the replies. Certainly plenty to digest. I think I`ll keep to the single opamp design for now, and carry on tinkering with the breadboard. As a first `improvement` albeit mainly current output increase, I`ll stick in a NJM4556AD and have a play. I want to experiment and...

Thanks for the info Bjornboy81, I`ve put together a basic Cmoy using an NE5532 on a breadboard, and although it`s a poor bipolar opamp, the audio is OK (ish). Your right, I am seeking higher output to drive low impedance Headphones. Would I be right thinking I could use a second paralleled...

Hi, First post and what a great site ! On to my question. Would it be possible to build the basic Cmoy with, say an OPA4132 and use 2 of the channels for the buffer, the other two for the stereo amp ? Does a schematic exists ? Many thanks, Andrew.