开云体育

You may want to check the other variants of the "74" class, such as ACT, and ACHT.? Note that the T = TTL compatibility on the inputs, but TTL to CMOS (straight) does not.? 2.4 volts minimum output

The doc. doesn't seem to show where to tap the sawtooth from. i.e R1350 input.

Earlier today, I did as I described earlier and successfully "programmed" the DS1742W, cloaking it as a DS1750W, at 3.3 V on a TL866II Plus. The TDS 3014B's ethernet connection is working fine now!

Earlier today, I did as I described above and "programmed" the DS1742W successfully at 3.3 V on a TL866II Plus. Raymond

Hi, When I look at the Nexperia 74HCT112 data sheet I would guess that it will be fast enough. You may have to buy a few and hand select. But, and it's a big but, they look to only be available in

Just spotted a scopemobile for 7K gear at an auction in Paso Robles, Ca (south west of the bay area).? Lot 131:

hmmm... Looked at the TI datasheet: fmax for the 74HCT112 is typically 60 Mhz. So it is worth trying. I somehow got the price wrong by a few cents, at mouser it is actually 68 cents in single

Sounds to me like the crystal oscillator is feeding a shorted input. -Chuck Harris John wrote:

Agreed and thank you for pointing that out. I will not be using the "LS" variant as replacements then. However, the 74HCT112 seems to be rated at 66MHz at a Vcc of 5V?

Makes sense to look at the rated speeds. Tek picked the S type for a reason, and it is clock speed. If the oscillator is replaced, the original part numbers would work as designed, as they did for the

Raymond, Contacted you through MP. Leo

The 74HCT112 is only guaranteed for 24MHz clock. The 74S112 is rated for 80MHz minimum. The 74F112 is rated for 100MHz min.

Thanks for the info! I've seen a couple versions of the TM503 too, even what looked like a TM5003 of sorts with no markings or real part number, it appeared to be a part of a 'pre-built' unit that was

John, 540uF and 390uF sound like 'preferred values' as in resistor values. As far as I know there is no reason for any great precision on the values of reservoir and smoothing capacitors, too small

tgerbic, ok, I think I get this now. There are only 4 actual pins, but their positions are mapped onto a 14 pin DIL package? So far corners would be 1, 7, 8 and 14 as indicated? You are correct that

Comments Interleaved: Pretty much have to be.? The monitor is pretty much a standard VGA monitor (I'd think) and needs the usual assortment of HV section, Horizontal and Vertical drivers (for the

I don't have a 2235 manual on hand but this sounds very similar to my case with the T948 main inverter transformer (120-1348-03) used in the 2213A that had failed, in my case on a scope I fixed about

Hi Leo, I have a 2215 wreck (very incomplete) with a transformer, will have to check. I also have a 2235 with a defective primary switcher. Never tried to repair. Contact me if interested. Raymond

Harvey is the BEST!!! I need him to download his brain and email me a copy of it! Thanks Harvey for helping everyone here!!!