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2SK508 MOSFET. Datasheet pdf. Equivalent
I guess this set was supposed to mimic an analog not only in look and feel but also in power consumption, being geared more towards the traveler rather than the shortwave enthusiast who’d obviously prefer the ‘DS by quite a margin.
The resulting versions are:. Main board schematic plus corrections and changes from supplement-1 [1. While the differences between various international versions were generally pretty much restricted to FM coverage starting at either 76 or Partly but not solely due to all the different versions, the service docs are pretty thick, in stark contrast to the ‘s minimal service manual!
In case you are wondering where the second AGC line used for post-preamp AGC went in post samples unlike its predecessor circuit, the opamp based AGC amp has only one outputlook at the first correction from supplement-1 — the main board schematic from the original service manual does not fully cover the changes.
Created yyyy-mm-dd Last revision It has always worked well until the last year or so, when the distortion on AM started to creep in, and finally got bad enough to make me get in to it.
It will seem that Sony likes to refresh existing IC designs once in a while, replacing older ICs with new functionally identical ones, probably to accomodate for changed production processes. Looking at the circuitry, I would agree with the assessment of adequate, but not outstanding shortwave performance.
The ribbon cable connector on the datasbeet should be a two-part locking piece that releases the cable when the upper part is pushed upwards, similar to what the SW has. The 2nd mixer in the older set is less prone to overload as well. The first one in particular was not minor, indicating that several bugs had to be worked out. While being quite ingenious when originally thought up aroundit already was outdated by the time the ICF came out and inexpensive frequency counters would have allowed a conventional dual conversion design datashet ultimately better reception and readout accuracy if not the same stability, always a problem with wide-range analog tuned oscillators.
I bought a used ICF in Interestingly the preceding ICF-SW30 used a double balanced mixer, but its 2sk580 interface left quite a bit to be desired. Head over to my receiver review corner in order to read it.
Sony datasehet the 1st IF of Not that much of a battery hog. I conducted a head-to-head comparison with my trusty SWG both just on the whipwhich resulted in my first ever “official” radio review.
I have mentioned a local one in the misc links section.
That seems like the most sensible way of performing the adjustment, given that we want the best possible real-life AGC performance. There is no mechanical reason to remove the speaker from the case.
2SK508 Datasheet PDF
While this is of adequate quality, my own scan of the regular non-L ICF’s schematic is somewhat better still: If you want to operate the set out of the case, substitute another speaker, or use extension leads to the one in the case. This is done by adjusting RV2 a trim pot near the upper right corner of the main PCB’s component side so that a voltage of 1. This had me puzzled for a while. ICF Additional information Servicing and internals.
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I did not get a VM accurate to 3 or 4 2sl508 places to adjust it, Dztasheet just tuned a strong local AM mw music station, Listened on a set of High-Fi earphones with good bass response, and adjusted it for least distortion. After having studied the service manual of the ICF LI’d summarize the architecture of the set as follows:.
These days, this receiver concept really is something for weaker signal areas only, and I would therefore hesitate to recommend buying a new receiver using it they typically do seem to have fairly good selectivity though. And in fact, I think that much improved readout accuracy and improved stability were the main reasons for choosing this concept over a classic single conversion one, along with better image and spurious rejection. The “about” part is because the mixer takes its constant mixing frequency datasueet a crystal oscillator with switched crystals of For FM and MW, this turns out to be fairly simple, signals from the whip antenna or ferrite rod antenna, respectively, are fed virtually directly to the CX mixing, demodulation and audio amp IC I wouldn’t be surprised if it also contained a function for walking the dog, 2skk508where they’re mixed to I did this for inspection purposes, datashwet when I had located RV2, I plugged it back in, and was able to operate the set with the board raised, so I could adjust RV2.
Now, find the molded-in plastic hooks that hold the board in datashedt, and release the board and lift it up. The interesting part is that if you can’t find a datasheet for one version, one that covers another version generelly will also do datashheet you can still buy at least the current iteration of such a chip in case a replacement is needed.
After this, two cascaded and I suppose: The critical part in terms of drift remains the 1st LO. This is far as I went with the dis-assembly, but it was obvious that all you have to do to strip the set completely, is unsolder the wires to the speaker and leave it behind, glued to the front panel.
2SK MOSFET Datasheet pdf – Equivalent. Cross Reference Search
It has worked like new ever since. The original service manual bears a coppyright date of It had apparently been someone’s workshop radio, judging from the huge amounts of brownish dust inside and several paint sprinkles outside.
Here’s what Google Translation makes of it. There is a screw between the lower edge of the board and the battery compartment to be removed.
Incidentally, the venerable ICFW isn’t a Wadley receiver either, just an almost “normal” dual conversion rx with a tuned front-end and bipolar balanced mixer, btw that reuses dataasheet FM IF filters for the 1st SW IF, with a crystal-based marker frequency generator kHz and a slightly and precisely adjustable 2nd LO frequency thrown in. The receiver features no less than four front ends: Sounds dwtasheet — however, fairly comprehensive disassembly will be required to get to this point, which is not entirely trivial see the next section as well as the linked Japanese page.
The “digitals”, by comparison, vary this 1st mixing frequency and thus can employ narrow crystal filters in dztasheet 1st IF to reduce IM3 by the 2nd mixer — but they don’t have to fear frequency instability as much as analogs.