russel
./_dazed_and_confused
Thats why we have exams, peer review…
@lordsummit
@Tony L
Please lock / close / delete this my thread
It is not going in a healthy direction
Thanks
Another question or two
I've made a rectifier board with smoothing caps...No resistors or Inductors fitted at present
I stuck a couple of probes on the output and (with the oscilloscope) on DC it showed a fairly nice trace (+ and - dc) with surprisingly little ripple ect (maybe 2mv)
So I changed over to AC reading and saw the picture below
[/url]Ac by rock solid, on Flickr
Now please don't take the piss out of my ancient 'scope or my complete lack of knowledge in these matters....but is that bad? (or is it just 50Hz noise creeping through)
scope set to 10mv/cm time 2ms/cm (+ signal at top - at bottom)
Also
I have a couple of the old 2014 VBE group buy boards...is it worth trying to cram them into my case layout (for the front end of the NCC300 mono voyager builds?)
Thanks again for your thoughts and suggestions
No ...not set to cal? If you look closely you can JUST make out the dot is next to the R of variable..
Glad that looks normal!
I'm waiting for some 2R2 resistors to put on the boards ...(didn't want to go to 4R7)
Also have some hand made 10uh inductors fo go on as well
You might remember we talked about half wave rectified boards earlier in the post
Ps
Glad you like the scope.. though it does take 10 minutes to warm up and working properly these days
I've been assuming the board is for use with a power amp? If so then 2R2 or 4R7 are way too high in value. If for a pre amp then fine and the high values will give excellent rejection of ripple. If for a power amp use just the inductors.
Did not know that
It is for a power amp (back end of NCC 300 board)
Ok...will scrap the resistors and just put in another set of inductors...so two per side of each board ... sound better?
The NCC300 board has regulators built into the input stage. Does that impact your advice?If it was to drive just the input stages then the larger value resistors would have been fine but to drive the output stages... nope. Assume you want to drive 4R speakers for a moment... what do you think will happen if it has to go via 2R2 or 4R7 resistors?
The NCC300 board has regulators built into the input stage. Does that impact your advice?
The NCC300 board has regulators built into the input stage. Does that impact your advice?
I suspected that the regulators would negate the impact of those resistors.If you are talking of a separate supply for the input stages then no. Regulators should negate any advantage of a separate supply though.
The Voyager moniker is a bit ambiguous. I've always construed it to mean having a separate, regulated supply for the input stage (e.g. transformer, CAP6, VBE/HRC200). With the NCC200 and NCC220, that's clear cut, so "Voyager" is a binary distinction.Mike I think Jez's reply relates to using the boards in a voyager configuration...as I intend to use
If you have a regulated supply (like the input stage of the NCC300), then Jez is stating that the unrelated supply that feeds that isn't so impactful. Therefore, it probably wouldn't matter if it's resisters or inductors between the banks/pairs of capacitors.If your using the jumpers...then don't use the resistors?
Given I've never seen Les publish any pictures in that configuration, I assume it's not a worthwhile alternative.When fed from one PSU you coule try if there is a difference between having the front end and power stage wired separately to the PSU or having them hooked together with the jumpers onboard...
I started this thread