2SK508 DATASHEET PDF
2SK datasheet, 2SK circuit, 2SK data sheet: UTC – HIGH FREQUENCY AMPLIFIER N-CHANNEL SILICON JUNCTION FIELD EFFECT. 2SK Datasheet PDF Download – HIGH FREQUENCY AMPLIFIER -CHANNEL SILICON JUNCTION FIELD EFFECT TRANSISTOR, 2SK data sheet. 2SKLK53 from NEC Corporation. Find the PDF Datasheet, Specifications and Distributor Information.
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While being quite ingenious when originally thought up aroundit already was outdated by the time the ICF came out and inexpensive frequency counters would have allowed a conventional dual conversion design with ultimately better reception and readout accuracy if not the same stability, always a problem with wide-range analog tuned oscillators.
Now, find the molded-in plastic hooks that hold the board in place, and release the board and lift it up. The original service manual bears a coppyright date of That seems like the most sensible way of performing the adjustment, given that we want the best possible real-life AGC performance. Suck the solder out of the hole for the ground wire that joins the 2 boards with a pump or wicking.
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. While this is of adequate quality, my own scan of the regular non-L ICF’s schematic is somewhat better still: The “digitals”, by comparison, vary this 1st mixing frequency and thus can employ narrow crystal filters in the 1st IF to reduce IM3 by the 2nd mixer — but they don’t have to fear frequency instability as much as analogs.
If you want to operate the set out of the case, substitute another speaker, or use extension leads to the one in the case. Here’s what Google Translation makes of it.
2SK508 MOSFET. Datasheet pdf. Equivalent
While I guess that it 2ek508 make a night-and-day difference, you may want to re-peak L3 at about kHz, preferably when you’re working on such a set anyway. I bought a used ICF in The receiver features no less dtaasheet four front ends: Created yyyy-mm-dd Last revision The 2nd mixer in the older set is less prone to overload as well.
I forget if the plastic hook catches need to be pressed in, or pried out, but the back cover came off without a fight. And in fact, I think that much improved readout accuracy and 2sk580 stability were the main reasons for choosing this concept over a classic single conversion one, along with better image and spurious rejection.
Head over to my receiver review corner in order to read it. The track side of the analog board is now visible. After this, two cascaded and I suppose: After having studied the service manual of the ICF LI’d summarize the architecture of the set as follows:.
Interestingly the preceding ICF-SW30 used a double balanced mixer, but its user interface left quite a bit to be desired. This, BTW, uses a 2SKY FET and a variable mixing frequency that’s what you vary with the main tuning knob — a “digital”, by contrast, has a constant 2so508 mixing frequency since the dztasheet variation part already took place one IF earlier. In this form, it cannot reach the same raw reception performance as a “normal” dual conversion concept; this would have required both a tracking filter on the 1st IF and a beefier 2nd mixer.
The trick when tuning the 2so508 is finding a marker het close to the desired frequency. The ribbon cable connector on the board 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 first one in particular was not minor, indicating that several bugs had to be worked out. Combining a wideband frontend with an unbalanced first mixer — as found in these inexpensive sets — is not a very smart thing to do, as 2nd order intermod quickly becomes a major problem.
Catasheet is no mechanical reason to remove the speaker from the case. My experience opening the set was not traumatic, I removed the 4 long screws marked by the arrows on the backthen working along the first seam of the back cover with a pocket knife, discovered I should pry the back cover away from the thin spacer that runs around the set. This is far as I went with the s2k508, 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.
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. Sony chose the 1st IF of 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!
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. Incidentally, the venerable ICFW isn’t a Wadley receiver either, just an datashewt “normal” dual conversion rx with a tuned front-end and bipolar balanced mixer, btw that reuses some 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.
Should you experience audio distortion in the AM mode 2s,508, particularly with bass-heavy content, the AGC adjustment needs to be carried out. If you need a service manual in paper form, there are various sources that sell ’em. This had me puzzled for a while.
I have mentioned a local one in the misc links section. The critical part in terms of drift remains the 1st LO. Not that much of a battery hog. I did not get 2sk50 VM accurate to 3 or 4 decimal places to adjust it, I 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.
It has worked like new ever since.
It’s not in the way datashret anything. 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, hiwhere they’re mixed to I did this for inspection purposes, and when I had located RV2, I dxtasheet it back in, and was able to operate the set with the board raised, so I could adjust RV2.
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.