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matching
In electronics, impedance matching is the practice of designing the input impedance of an electrical load or the output impedance of its corresponding signal source to maximize the power transfer or minimize signal reflection from the load. A source of electric power such as a generator, amplifier or radio transmitter has a source impedance which is equivalent to an electrical resistance in series with a reactance. An electrical load, such as a light bulb, transmission line or antenna similarly has an impedance which is equivalent to a resistance in series with a reactance. The maximum power theorem says that maximum power is transferred from source to load when the load resistance equals the source resistance and the load reactance equals the negative of the source reactance. Another way of saying this is that the load impedance must equal the complex conjugate of the source impedance. If this condition is met the two parts of the circuit are said to be impedance matched.
In a direct current (DC) circuit, the condition is satisfied if the load resistance equals the source resistance. In an alternating current (AC) circuit the reactance depends on frequency, so circuits which are impedance matched at one frequency may not be impedance matched if the frequency is changed. Impedance matching over a wide band will generally require complex, filter-like structures with many components except in the trivial case of constant source and load resistances when a transformer can be used.
In the case of a complex source impedance ZS and load impedance ZL, maximum power transfer is obtained when
Z
S
=
Z
L
∗
{\displaystyle Z_{\mathrm {S} }=Z_{\mathrm {L} }^{*}\,}
where the asterisk indicates the complex conjugate of the variable. Where ZS represents the characteristic impedance of a transmission line, minimum reflection is obtained when
Z
S
=
Z
L
{\displaystyle Z_{\mathrm {S} }=Z_{\mathrm {L} }\,}
The concept of impedance matching found first applications in electrical engineering, but is relevant in other applications in which a form of energy, not necessarily electrical, is transferred between a source and a load. An alternative to impedance matching is impedance bridging, in which the load impedance is chosen to be much larger than the source impedance and maximizing voltage transfer, rather than power, is the goal.
Looks like a 1954 Belair humped a Yugo GV:eek:
Custom stained Yugo M70 furniture kit with 4 matching magazines for M70, N-PAP, or Z-PAP
Magazines are made in Russia by PUF GUN, no longer imported, finished to match the stained hand guard and stock
Asking $150
No rifle, just mags and furniture
Has sights. Doesn't need channel liner installation. Isn't complete doesn't have upper parts kit.
Comes with aftermarket magazine as well if I can find it.
Got it for a project, but plans change...
Trades....
P320 stuff. Mainly slides. Hopefully trying to get a large frame slide...
G21...
Yugo Underfolder parts kit $800 f2f $815 shipped
Original Barrel, bore and bullet test pics below
Zastava Kragujevac marked rear sight block
Tapco G2 Double Hook trigger group
All matching numbers
Parts were also electro penciled with another number. All of those numbers match as well.
It is...
Type 56 carbine sks with trench art and matching serial numbers. The only thing replaced on this gun was the jungle stock. Given the wear patern of the blueing and the fact the bayonet is blued, I suspect this gun was carried in combat.
931 305 8290
$450 - Norinco SKS.
Has been cleaned and de-cosmolined
Excellent bore.
Wood shows some wear as pictured. Majority of cosmoline stripped out of the stock, and remainder was drawn out via heat gun and spread to preserve the color.
Next step would be steam to try and pop out some of the dents...
Picked this up in a partial trade. Haven’t mounted it. Very clear all the way around the glass. Msrp was like 2200, plus the mount. Then custom paint and turrets. Matching mount. Asking 1500 cash for the optics and mount. I’d be open to trades. Mostly looking for a shotgun or PWS upper...
New in box, matching/mated AR lower and upper. 17Design billet. $150 shipped
New, never built, so can be treated as "other" in transfer for simplicity.
Also, Rock River m4 upper. Is a blem with mis-print on T marks. New, never used. $80 shipped.
Selling a set of 4 Cooper Evolution tires. 235/60R16
These came off a subaru outback and still have some great tread life left. Approximately 50%
All 4 tires have been rotated regularly and exhibit even wear patterns. They do well in the snow and would make a great set for backup incase you get...
What you see are what you will get. In great condition!
- Round receiver: Ask $575
- Hex receiver. Ask $649
OBO. No low ball please.
buyer pay transfer
Keep saying I'm going to do something with this. But now I'm just gonna list and let this go.
Oem and looks unfired has standard 3 dot sights on it. No firing pin, extractor, etc
Comes with a mag for a G43 frame as well.
Interested in trades as well.
Up for sale is an AK-74 that's all #s matching kit with an original bulgy chrome lined barrel on a nodak spud receiver. You cannot find a rifle like this anymore. At most 400 rounds through it, but probably not that much. It has k-var usa made polymer furniture and a manticore arms break. Mag...
Have a 1958 Chinese sks. Bought from a collector who had never fired it. The cosmoline was still on it when I picked it up. So there is a lot of mystery behind this gun. No paper work but everything is there. Has the triangle stamp if you were wondering. Only con is that the gun is not as pretty...
For sale I have a Russian Izhevsk Mosin-Nagant 91/30 made in 1941. All numbers are matching (except for the bayonet) and the gun has gone through a post-war refurbishing so it is in very good shape except for the finish missing from some of the top handguard which you can see in the photo. Bore...
For sale I have a Russian Nagant Revolver with all matching numbers made in 1930. Gun is in very good shape for its age and has many stamps and markings on the metal which is typicaly of Combloc guns. These are seven shot revolvers that use a unique "gas seal" system to prevent gas from escaping...
All numbers matching bulgy 74 kit with US nitrided 5.56 barrel, Childers Guns 5.56 marked receiver, Schaffer AR mag well adapter, US trigger group, US pistol grip, side mount scope rail, axis pin retaining plate. Will include all the original trigger bits and pistol grip. Wood furniture is in...
I had this on a Matrix frame, but never got around to using it and am now going in a different direction. The surface finish isn't perfect - it's got a few spots here and there needing a little love, but it's in much better shape than a few I've seen.
Price is OBO. If you give me asking price...
Lee Armory Romanian AKMS rifle 1966 Cugir factory matching numbers kit
>30 rounds put through it for headspace, function testing & sight zero
>passed all headspace & quality control testing
>The FCG & action is really is responsive, smooth
>iron sights are battle zeroed at 200 yards on 4" steel...