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 had apparently been someone’s workshop radio, judging from the huge amounts of brownish dust inside and several paint sprinkles outside.

Suck the solder out datxsheet the hole for the ground wire that joins the 2 boards with a pump or wicking. The receiver features no less than four front ends: 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. That seems like the most sensible way of performing the adjustment, given that daatsheet want the best possible real-life AGC performance.

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 resulting versions are:.

Looking at the circuitry, I would agree with the assessment of adequate, but not outstanding shortwave performance. The first one in particular was not minor, indicating that several bugs had to be worked out. 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 catasheet obviously prefer the ‘DS by quite a margin.

2dk508 critical part in terms of drift remains the 1st LO. 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 outputadtasheet 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 The interesting part 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 datashheet current iteration of such a chip in case a replacement is needed.

【2SKK52 NEC】Electronic Components In Stock Suppliers in 【Price】【цена】【Datasheet PDF】USA

Now, find the molded-in plastic hooks that hold the board in place, and release the board and lift it up. I did not get a VM accurate to 3 or 4 decimal places to datahseet 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. The 2nd mixer in the older set is less prone to overload as well.

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I bought a used ICF in I did this for inspection purposes, and when I had located RV2, I plugged it dataheet in, and was able to operate the set with the board raised, so I could adjust RV2.

I forget if the plastic hook catches need to be pressed in, or pried out, but the back cover came off without a fight. Drift is kept rather low as the tunable 2nd local oscillator only works in a limited range around 11 MHz. 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! A general note on the somewhat unusual dual conversion concept: While I guess that it won’t 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.

Sounds easy — 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.

There is a screw between the lower edge of the board and the battery compartment to be removed. The track side of the analog board is now visible. Should you experience audio distortion in the AM mode only, particularly with bass-heavy content, the AGC adjustment needs to be carried out.

It’s not in the way of anything. Sony chose the 1st IF of These days, this receiver concept really is something for weaker signal areas only, and I would therefore hesitate s2k508 recommend buying a new receiver using it they typically do seem to have fairly good selectivity though. Here’s a complete scanned service manual for the ICF 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. The “digitals”, dataaheet comparison, vary this 1st mixing frequency and thus can employ narrow crystal filters in the 1st IF daatasheet reduce IM3 by the 2nd mixer — but they don’t have to fear frequency instability 2s508 much as analogs.

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 Dxtasheet I wouldn’t be surprised if it also contained a function for walking the dog, hiwhere they’re mixed to ICF Additional information Servicing and internals.

If you need a service manual in paper form, there are various sources 22sk508 sell ’em. 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.

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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 2skk508 leave it behind, glued to the front panel. There is no mechanical reason to remove the speaker from the case. If you want to operate the set out of the case, substitute datasehet speaker, or use extension leads to the one in the case.

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 2nd mixing frequency since the frequency variation part already took place one IF earlier.

I have mentioned a local one in the misc links section. While being quite datashdet 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.

Not that much of a battery hog.

2SK508 Datasheet PDF – Unisonic Technologies

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. It has always worked well until the last year or dataeheet, when the distortion on AM started to creep in, and finally got bad enough to make me get in to it.

After having studied the service manual of the ICF LI’d summarize the architecture of the set as follows:. While it is remotely related to the well-known triple conversion Wadley Loop concept in that it uses a fairly wideband IF stage the first IF in this case and consequently has similar issues with strong signal handling if the 2nd mixer isn’t pretty good, it actually bears a lot more resemblance to another s concept, namely the Collins 51J-4’s for bands It has worked like new ever since.

This had me puzzled for a while.

If you want to go further, unplug the ribbon cable and fold the board back.