2SK508 DATASHEET PDF

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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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There is a screw between the lower edge of the board and the battery compartment to be removed. ICF Additional information Servicing and internals.

2SK508 – HIGH FREQUENCY AMPLIFIER -CHANNEL SILICON JUNCTION FIELD EFFECT TRANSISTOR

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 resulting versions are:. If you need a service manual in paper form, there are various sources that sell ’em. 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 are typically found between about to kHz.

The critical part in terms of drift remains the 1st LO.

The 2s5k08 cable connector on the board should be a two-part locking piece that releases the cable when 2sk50 upper part is pushed upwards, similar to what the SW has. That seems like the most sensible way of performing the adjustment, given that we want the best possible real-life AGC performance. Should you experience audio distortion in the AM mode only, particularly with bass-heavy content, the AGC 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! It’s not in the way of anything.

Looking at the circuitry, I would agree with the assessment of adequate, but not outstanding shortwave performance. Here’s a complete scanned service manual for the ICF Sony chose the 1st IF of Drift is kept rather low as the tunable 2nd local oscillator only works in a limited range around 11 MHz.

While this is of adequate datashwet, my own scan of the regular non-L ICF’s schematic is somewhat better still: The 2nd mixer in the older set is less prone to overload as well. Datqsheet track side of the analog 2sk08 is now visible. 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.

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Main board schematic plus corrections and changes from supplement-1 [1. After having studied the service manual of the ICF LI’d summarize the architecture of the set as follows:.

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.

Not that much of a battery hog. Here’s what Google Translation makes of it. 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.

2SK NEC, 2SK Datasheet

Now to the most interesting part, the shortwave bands, where the receiver works with dual conversion: Created yyyy-mm-dd Last revision There is no mechanical reason to remove the speaker from the case. The “about” part is because the mixer takes its constant mixing frequency from a crystal oscillator with switched crystals of The first one in particular was datashet minor, indicating that several bugs had to be worked out.

A general note on the somewhat unusual dual conversion concept: 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.

The receiver features no less than four front ends: 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, find the molded-in plastic hooks that hold the board in place, and release the board and lift it up.

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I forget if the plastic hook catches need to be pressed in, or pried out, but the back cover came off without a fight.

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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 good bass response, and adjusted it for least distortion. For FM and MW, this turns out to be fairly simple, signals from the whip antenna or ferrite rod antenna, respectively, are fed 2sk58 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 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.

It has worked like new ever since. 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.

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.

2SK508 Datasheet PDF – Unisonic Technologies

After this, two cascaded and I suppose: While the differences between various international versions were generally pretty much restricted to FM coverage starting at either 76 or Suck the solder out of the hole for the ground wire that joins the 2 boards with a pump or wicking.

The original service manual bears a coppyright date of 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. Head over to my receiver review corner in order to read it. The trick when tuning the rx is finding a marker het close to the desired frequency. If you want to go further, unplug the ribbon cable and xatasheet the board back.