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I used to have an IBM 5100, what would you like to know about it? Flip the front switch to select APL or BASIC, turn it on and start typing. That was it. BTW you should know that the 5100 and similar

Thanks for the replies, R160 didn't have any effect on the trace. I think the problem might be in the attenuator/source follower part Attenuator in 10mV/div setting. Resistance from BNC to R130 shows

Guys, I know this confusion can happen from time to time, but someone coming to these posts on "Resistor in Series" will have no idea what item of Tek gear is being referred to. I am assuming that it

The extenders do make things a lot more convenient but you can make many measurements just by taking the left cover off the 7A26, putting the 7A26 in the left vertical slot and taking the left cover

I once went to a course in London, Frequency Synthesis by a Robert Dixon, an American. He said - call me Bob, Mr. Dixon is my father (sorry folks, I could not help it). G?ran

There are several Facebook groups that deal with buying,selling,and collecting vintage computer hardware

Thanks, I'll check it out. If anyone has other suggestions, please do let me know. wrote:

Hi Jeff, Please call me Tom. :) Some critical diode parameters are rarely discussed in EE curricula, so you have every right to be flummoxed by datasheets. It is also not infrequently the case that

If the measured resistance is higher than that in the circuit diagram you may have a problem as it may not bypass enough current across Q1354. If you are getting replacements it would be worth putting

On my 475 parts list it mentions TI60 or 1N647, which are general purpose diodes with 400 V reverse breakdown so a 1N4004 would replace it. Simon

Simon, my reading of the schematic says that once I have pulled Q1352, Q1354, and Q1358 from their sockets the resistors are only connected to the rest of the circuit through two diodes, one of which

That could explain why you have a positive voltage at TP1364. I am not an electronics engineer, but would use a 1N4004 as it looks as though it protects Q1362. Simon

I guess I don't quite get what the ripple current spec is actually telling me. That this is the amount of ripple current the cap can take to make the lifetime spec? A spec with twice the ripple for a

Dr. Lee, Thank you, that feels like high praise, and it means that I'm learning something. In my defense, I was going to be an EE, before I bailed to CS in my junior year, so I had a bit of exposure

This was very helpful to get me started: https://www.electronics-tutorials.ws/capacitor/cap_3.html In trying to understand the Nichicon series Mark gave I found this:

Mark Vincent is spot on regarding electrolytics. Film caps - Polyester (cheaper and smaller), or Polypropylene (larger and expensive) are usually a no-brainer ultra-long-life substitute for tantalums,

Didn't think of that, duh. Simon

I think there is a way.? If nothing else is connected at the junction of the resistors, short the ends of the combination together and measure from the shorted ends to the junction of the two

I think Roger’s explanation of the reason for two resistors in series makes sense (better heat dissipation in a small space) as 2 x 7.5 k? = 15 k?, which is a common value. It looks as though

Hi Jeff, As you correctly surmised, a 1N4148 would indeed be perfectly fine in this case. Those two diodes are pretty much the same, with the '4152 tested to tighter tolerances. For a non-EE, you did