Assuming I use 1 transformer to power 2 shuntys (?shunties) - is the correct way to wire 1 board to the transformer and using appropriately sized hook-up wire to connect this shunty to the AC in of the next shunty?
Looking at the schematic - I assume that a transformer with 2 separate secondaries can be used - as long as the centre 2 wires are connected?
her shann
Looking at the schematic - I assume that a transformer with 2 separate secondaries can be used - as long as the centre 2 wires are connected?
her shann
hershann said:
The trafo's secondaries must be connected to both Shunties AC input. You can do that by taking the secondaries to the first Shunty's AC input, and from there to the next Shunty's AC input.
Or you can connect the trafo's secondaries to a screwterminal and fan them out from there, which I think would be a bit more practical. Especially if you have to take it apart, for some reason. Yes you must connect the 2 centerwires on a trafo with dual secondaries, allright.
hershann said:
A 1N4740 will still be good for some 0.9W if the surrounding temperature of the Zener-D is 40C.
900 mW divided 10 volts Zener-D drop is 90mA.
In steady state condition (C3/C3a loaded), there's some 10-20 volts difference between the rectified rail voltage and the stack of Zeners. (42-50Vac sec. transformer)
=> 3.5 to 7 mA Zener-D current.
3.5-7mA times 10 volts translates to some 5-10C temperature rise.
How much current/power handling you think the Zener-D will require ?
(ps : Zener diodes have a rotten accuracy, with at least 20 at hand it's easy peasy to match them in 5-string sets with an equal voltage droppie, personally i don't fancy a heatsink running 20% hotter than his opponent. In the worst case you don't have enough voltage slack for the 2nd regulation stage)
Cook Book notes
so - again - few new lines of additional notes JUST ON LAST PAGE ;
this is what's new :
where else than :
DOWNLOAD Cook Book
ya all nutz
so - again - few new lines of additional notes JUST ON LAST PAGE ;
this is what's new :
where else than :
DOWNLOAD Cook Book
ya all nutz
Another Junk Lunch :
Instead of a 5pF Mica, find a PTFE trimcap.
Look for Phili types in Europia.
In the North-Amerrygoround it's Sprague Goodman Filmtrim@ GXA/GXE series.
Last time i looked i saw a single one of the non-SMT listed for $4/pc.
So for the Yanksters it's either Flea-Bee, go Filmtrim SMT wacko or hit someone over the head.
Instead of a 5pF Mica, find a PTFE trimcap.
Look for Phili types in Europia.
In the North-Amerrygoround it's Sprague Goodman Filmtrim@ GXA/GXE series.
Last time i looked i saw a single one of the non-SMT listed for $4/pc.
So for the Yanksters it's either Flea-Bee, go Filmtrim SMT wacko or hit someone over the head.
HBarske said:
Nix gut, die ones at Reichelt sind probably polyester typen.
Google for (philips) 2222-808-11109
PTFE trimcaps have long gone out of production iirc, but are the only true good ones. (the dielectric of the ptfe trimcaps is pure white)
No touchy other types.
Vishay Beyschlag-Components numbers and datasheet : here
German made, what else !
2nd hand ones example : here
