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Search: Posts Made By: eccerr0r
Forum: General Electronics Technical Discussion 06-24-2019, 11:05 AM
Replies: 18
Views: 218
Posted By eccerr0r
Re: Found a transformer at a thrift store and am curious...

BTW I missed the original question, whether it can step down 120VAC. I doubt it or at least it probably would get hot. It was clearly designed for the audio range. You're better off locating a...
Forum: General Electronics Technical Discussion 06-24-2019, 09:26 AM
Replies: 18
Views: 218
Posted By eccerr0r
Re: Found a transformer at a thrift store and am curious...

Field Replacement Unit (i.e. replace a single transistor instead of a full PCB or even IC if a single transistor failed.)

Granted a single IC is physically smaller than a vacuum tube, but the IC...
Forum: General Electronics Technical Discussion 06-24-2019, 01:05 AM
Replies: 18
Views: 218
Posted By eccerr0r
Re: Found a transformer at a thrift store and am curious...

Or is it better to long for those days again where the FRUs are much smaller? :D
Forum: General Electronics Technical Discussion 06-23-2019, 11:36 PM
Replies: 18
Views: 218
Posted By eccerr0r
Re: Found a transformer at a thrift store and am curious...

Yeah you probably never studied them unless you found a vacuum tube or ancient transistor radio and took it apart. These things were by low impedance transistor 1970s designs. The 1960s vacuum...
Forum: General Electronics Technical Discussion 06-23-2019, 11:04 PM
Replies: 18
Views: 218
Posted By eccerr0r
Re: Found a transformer at a thrift store and am curious...

If you're younger than around 50 years or so, and unless you've studied old circuits, yes these are pretty much gone in today's electronics. In the past amplifying devices could not deal with...
Forum: General Electronics Technical Discussion 06-22-2019, 09:32 PM
Replies: 8
Views: 105
Posted By eccerr0r
Re: TO-220 exploded...estimated overload?

Yep the typical "transistor sacrifices itself to protect the fuse" deal... but how much power was it dissipating relative to package/mounting situation, up until that instant of failure (if it also...
Forum: General Electronics Technical Discussion 06-22-2019, 08:15 PM
Replies: 8
Views: 105
Posted By eccerr0r
Re: TO-220 exploded...estimated overload?

They're actually fine, fortunately just this one component fried this time around. It's the upper in a totem pole output with emitter resistors. (output stage of a class AB differential/direct...
Forum: General Electronics Technical Discussion 06-22-2019, 03:50 PM
Replies: 8
Views: 105
Posted By eccerr0r
Re: TO-220 exploded...estimated overload?

Strange, I didn't think it was mechanical damage but can't be sure. The bolt wasn't all that tight and it did have an insulating kit - and the plastic shoulder washer seemed intact which implies it...
Forum: General Electronics Technical Discussion 06-22-2019, 11:14 AM
Replies: 8
Views: 105
Posted By eccerr0r
TO-220 exploded...estimated overload?

Curious if anyone had some clues at estimated overcurrent/overpower necessary to cause a TO-220 transistor to smoke and blow up... like how many watts it was trying to dissipate/how hot it got.
...
Forum: General Computer Discussion 06-20-2019, 09:24 AM
Replies: 22
Views: 277
Posted By eccerr0r
Re: Considering building a retro system

Yes, hence I was lucky to get rid of the 256K units...

I still have a few 30-pin 1M and 4M units somewhere... but even so, these are tiny...
Forum: General Computer Discussion 06-19-2019, 04:10 PM
Replies: 22
Views: 277
Posted By eccerr0r
Re: Considering building a retro system

Hmm... I have an Adaptec 1542 and a 1522s somewhere, but I have a feeling that both will be clobbered by the VLB IDE controller I have for this 486, at least as far as I recall.

I don't have any...
Forum: General Computer Discussion 06-18-2019, 09:04 PM
Replies: 22
Views: 277
Posted By eccerr0r
Re: Considering building a retro system

Still have a 486 with a DX4/100 m/b (likewise VLB) somewhere. RAM is a problem, it has two 72-pin and four 30-pin SIMMs. I don't have enough dense SIMMs to do much with it.
Forum: General Electronics Technical Discussion 06-14-2019, 05:18 PM
Replies: 13
Views: 196
Posted By eccerr0r
Re: Electric mouse/rat trap power supply

Just like a static electricity spark will just startle people, same with rats. Need to feed power through their body to stop their heart and that'll kill them by suffocation effectively.

I don't...
Forum: General Electronics Technical Discussion 06-14-2019, 11:33 AM
Replies: 13
Views: 196
Posted By eccerr0r
Re: Electric mouse/rat trap power supply

Effectively it is a taser PSU. Tasers don't really have that much power, it's not like it has any range. If it's too weak or just a one shot, it effectively just becomes a "don't go here". In fact...
Forum: General Electronics Technical Discussion 06-14-2019, 10:55 AM
Replies: 8
Views: 203
Posted By eccerr0r
Re: Will This Work?

I wonder if the LT LTC device can withstand the reverse connected battery better than the chinese TP device?

BTW, despite their base part numbers, it looks like they are not pin compatible...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-09-2019, 06:01 PM
Replies: 90
Views: 1,085
Posted By eccerr0r
Re: Does flux expire ?? Flux discussion.

Coliformia is the state made of colifony of course <BOOO! HISS!>
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-09-2019, 08:22 AM
Replies: 90
Views: 1,085
Posted By eccerr0r
Re: Does flux expire ?? Flux discussion.

What if you're using lard/bacon fat as flux? :D
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-05-2019, 11:51 AM
Replies: 17
Views: 202
Posted By eccerr0r
Re: Crimping crimp-on RG58, RG174, etc. connectors without die?

In all these cases, the center pin is not a problem with ad hoc tools or even solder if it comes down to it (unless the connector was designed to be soldered, then your choices are limited.) The...
Forum: General Electronics Technical Discussion 06-05-2019, 09:32 AM
Replies: 11
Views: 203
Posted By eccerr0r
Re: SMPS mains input voltage question

Yes theoretically (that is the key word) it should be the same power, and hence should draw less current.

However it could be more (not properly designed for higher voltage) or less (theoretically...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-05-2019, 09:21 AM
Replies: 17
Views: 202
Posted By eccerr0r
Re: Crimping crimp-on RG58, RG174, etc. connectors without die?

BNC crimp, N crimp, PL-259 crimp, whatever - they all use the same collar when dealing with crimps - depending on the cable!

I don't think terminal blocks come with crimps and the SWR would be...
Forum: General Electronics Technical Discussion 06-05-2019, 12:08 AM
Replies: 11
Views: 203
Posted By eccerr0r
Re: SMPS mains input voltage question

how much power is it using at 230V compared to 110V? Same? more? less?
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-04-2019, 05:37 PM
Replies: 17
Views: 202
Posted By eccerr0r
Re: Crimping crimp-on RG58, RG174, etc. connectors without die?

Yeah, most of the screw on connectors cost $ARM$LEG. Grr.

On the other hand, I thought the RG59 compression connectors were really consistent (because so many are made/used, they had to get it...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-04-2019, 12:57 PM
Replies: 17
Views: 202
Posted By eccerr0r
Re: Crimping crimp-on RG58, RG174, etc. connectors without die?

Well depends on the type, yes, the RG6/RG59 ones I've seen are indeed single use and hence useless... Likewise the compression tool...

but there are the die based ones, of which I need to acquire...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-04-2019, 11:27 AM
Replies: 17
Views: 202
Posted By eccerr0r
Re: Crimping crimp-on RG58, RG174, etc. connectors without die?

You know, technically I just need the die... then I can stick it in my vise...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-04-2019, 08:47 AM
Replies: 17
Views: 202
Posted By eccerr0r
Re: Crimping crimp-on RG58, RG174, etc. connectors without die?

The center pin can be soldered for me, no problems with that. I just wonder if it's possible to cheat crimping the main connector. Sounds like I have to get a crimp tool.... ugh.

Mainly because...
Showing results 1 to 25 of 500

 
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