2SK508 DATASHEET PDF

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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.

I forget if the plastic hook catches need to be pressed in, or pried out, but the back cover came off without a fight. A general note on the somewhat unusual dual conversion concept: After this, two cascaded and I suppose: While this is of adequate quality, my own scan of the regular non-L ICF’s schematic is somewhat better still: Main board schematic plus corrections and changes from supplement-1 [1.

2SKT1B-A Renesas | Ciiva

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. Now to the most datahseet part, the shortwave bands, where the receiver works with dual conversion: There is a screw between the lower edge of the board and the battery compartment to be removed.

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. After having studied the service manual of the ICF LI’d summarize the architecture of the set as follows:. Sony chose the 1st IF of ICF Additional information Servicing and internals. Not that much of a battery hog. 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 datasheeet in to it.

It has worked like new ever since. I bought this set NEW from a Sony dealer inhave forgotten which year. Here’s what Google Translation makes of it.

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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 2ssk508. It had apparently been someone’s workshop radio, judging from the huge amounts of brownish dust inside and several paint sprinkles outside. It’s not in the way of anything.

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 s2k508 traveler rather than the shortwave enthusiast who’d obviously prefer the 2sm508 by quite a margin. I have mentioned a local dztasheet in the misc links section. 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.

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. While the differences between various international versions were generally pretty much restricted to FM coverage starting at either 76 or 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 fatasheet 2nd LO daasheet thrown in.

I bought a used ICF in The “about” part is because the mixer takes its constant mixing frequency from a crystal oscillator with switched crystals of If you want to operate the set out of the case, substitute another speaker, or use extension leads to the one in the case.

The track side of the analog board is now visible.

It will seem that Sony likes to refresh existing IC designs once in a while, replacing older ICs with new functionally datasheett ones, probably to accomodate for changed production processes. That seems like the most sensible way of performing the adjustment, given that we want the best possible real-life AGC performance.

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 the current iteration of such a chip in case a replacement is needed.

2SK508 Datasheet PDF – Unisonic Technologies

If you need a service manual in paper form, there are various sources that sell ’em. Here’s a complete scanned service manual for the ICF 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, 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. The trick when tuning the rx is finding a marker het close to the desired frequency. The receiver features no less than four front ends: 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.

There is no mechanical reason to remove the speaker from the case. 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.

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.

If you want to go further, unplug the ribbon cable and fold the board back. I conducted a head-to-head comparison with my trusty SWG both just on the whipwhich resulted in my first ever “official” radio review.

2SK Datasheet(PDF) – Unisonic Technologies

Now, find the molded-in plastic hooks that hold the board in place, and release the board and lift it up. The satasheet versions are:. The critical part in terms of drift remains the 1st LO.

The “digitals”, by comparison, vary this 1st mixing frequency and thus can employ narrow crystal filters in the 1st IF adtasheet reduce IM3 by the 2nd mixer — but they don’t have to fear frequency instability as much as analogs.

Drift is kept rather low as the tunable 2nd local oscillator only works in a limited range around 11 MHz. Head over to my receiver review corner in order to read it.

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