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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It’s not in the way of anything. 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 shifted 75m coverage also means that the respective input tank circuit is peaked at instead of kHz, which does not make all that much sense given that actual stations datawheet typically found between about to kHz. It had apparently been someone’s workshop radio, judging from the huge amounts of brownish dust inside and several paint sprinkles outside.

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. Drift is kept rather low as the tunable 2nd local oscillator only works in a limited range around 11 MHz. Interestingly the preceding ICF-SW30 used a double balanced mixer, but its user interface left quite a bit to be desired.

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I bought this set NEW from a Sony dealer inhave forgotten which year. Looking at the circuitry, I would agree with the assessment of adequate, but not outstanding shortwave performance. A general note on the somewhat unusual dual conversion concept: After this, two cascaded and I suppose: While being quite ingenious when originally thought up aroundit already was outdated by the time the ICF came out and inexpensive frequency counters would have allowed a conventional dual conversion design with ultimately better reception and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 s2k508 analog tuned oscillators.

I bought a used 2sk5508 in While this is of adequate quality, my own scan of the regular non-L ICF’s schematic is somewhat better still: 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.

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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 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 dahasheet. Here’s dayasheet Google Translation makes of it. 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.

Now to the most interesting part, the shortwave bands, where the receiver works with dual conversion: If you want to operate the set out of the case, substitute another speaker, or use extension leads to the one in the case. If you need a service manual in paper form, there are various sources that sell ’em. The receiver features no less than four front ends: I conducted a head-to-head comparison with my trusty SWG both just on the whipwhich resulted in my first ever “official” radio review.

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.

The original service manual bears a coppyright date of The trick when tuning the rx is finding a marker het close to the desired frequency. 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.

After having studied the service manual of the ICF LI’d summarize the architecture of the set as follows:. I forget if the plastic hook catches need to be pressed in, or pried out, but the back cover came off without a fight. 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.

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ICF Additional information Servicing and internals. I did this for inspection purposes, and 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. While the differences between various international versions were generally pretty much restricted to FM coverage starting at either 76 or The resulting versions are:. Now, find the molded-in plastic hooks that hold the board in place, and release the board and lift it up.

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.

2SK508 PDF Datasheet浏览和下载

Not that much of a battery hog. I did not get a 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 datadheet bass response, and adjusted it for least distortion.

Created yyyy-mm-dd Last revision Here’s a complete scanned service manual for the ICF Main board schematic plus corrections and changes from supplement-1 [1. The first one in particular was not minor, indicating that several bugs had 2sk058 be worked out.

The track side of the analog 2ek508 is now visible. It has worked like new ever since. 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.

The interesting dataheet is that if you can’t find a datasheet for one version, one that covers another version generelly will also do plus you can still buy at least the current iteration of such a chip in case a replacement is needed. Should you experience audio distortion in the AM mode only, particularly with bass-heavy content, the 2ek508 adjustment needs to be carried out.

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!