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Search took 0.00 seconds. Search: Posts Made By: stj
Forum: General Electronics Technical Discussion 11-29-2015, 10:16 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

to find the best temps, look at the datasheets for the solder & flux.
Forum: General Electronics Technical Discussion 11-29-2015, 01:39 AM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

i use 310 for everything other than low-temperature soldering with 5% silver solder.
Forum: General Electronics Technical Discussion 11-29-2015, 12:17 AM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

that's the type.
Forum: General Electronics Technical Discussion 11-29-2015, 12:17 AM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

343' seems high, i solder at 310' with lead-free solder.
Forum: General Electronics Technical Discussion 11-28-2015, 06:58 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

cant find a good foto, but you want a pair where the blade is ground on the inside only.

they are usually called "flush cutters"
Forum: General Electronics Technical Discussion 11-28-2015, 06:11 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

your cutters are making that look, get a pair with a flush-blade on the outer edge.

factory's used to use a saw to trim all the leads years ago,
now the leads are pre-cut before they are...
Forum: General Electronics Technical Discussion 11-28-2015, 03:05 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

pretty good,
Forum: General Electronics Technical Discussion 11-27-2015, 04:00 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

red wine - mmmmm...

after 24hours is good, after 48 it starts to go downhill.
just kill the bottle the first day - problem solved.
Forum: General Electronics Technical Discussion 11-27-2015, 02:01 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

you dont need flux to desolder with hot air if you can see the pins.

BGA is a completely different situation, your using the flux to transfer the heat under the package.
using a nitrogen gas-flow...
Forum: General Electronics Technical Discussion 11-27-2015, 11:30 AM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

why would you need flux to remove something???

say i want to remove a 144pin chip - because i do them by hand.
(yes, i do!)

i heat the chip with the handheld air unit, till it lifts off the...
Forum: General Electronics Technical Discussion 11-26-2015, 09:44 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

practice on something scrap.

btw, you dont use flux with solder-paste.
solder paste is flux already with powdered solder in it.
Forum: General Electronics Technical Discussion 11-26-2015, 09:31 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

if you flux them and heat them with hot air they will float and re-align with the pads.
Forum: General Electronics Technical Discussion 11-25-2015, 06:12 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

maybe you should try a new battery in your meter.
just in case!
Forum: General Electronics Technical Discussion 11-25-2015, 05:39 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

if the seller actually has a datasheet, i would insist on the voltage, current and disipation numbers.
he obviously wants to hide the mfr/supplier name.
Forum: General Electronics Technical Discussion 11-25-2015, 02:20 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

they round it to the nearest available resistor value, it may have been just over 1/4w
Forum: General Electronics Technical Discussion 11-25-2015, 12:54 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

http://led.linear1.org/1led.wiz
:)

http://led.linear1.org/diagram.png.php?q=YnJvd24gZ3JlZW4gYnJvd24gMTIgNiA0MCAxNTAgMS8yVw==
Forum: General Electronics Technical Discussion 11-24-2015, 08:21 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

HD44780 is the interface, originally it was the part number of the chip but they are cloned to hell now.

BC1602A is the display that is using the chip - part number suggests 16characters by 2...
Forum: General Electronics Technical Discussion 11-24-2015, 05:45 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

R2 would depend on the display, modern displays can use a single high-eficiency led with a good light-pipe,
older ones could use anything from 2 to 10 or more - specially if they are actually "back"...
Forum: General Electronics Technical Discussion 11-23-2015, 03:35 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

what's this about?
Forum: General Electronics Technical Discussion 11-21-2015, 03:15 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

manual for your learning.
Forum: General Electronics Technical Discussion 11-20-2015, 09:30 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

you must have a lot of space!!
Forum: General Electronics Technical Discussion 11-20-2015, 05:54 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

some of the best come from here:
http://elaut.com/amusement/Belgium/index.php
Forum: General Electronics Technical Discussion 11-20-2015, 03:38 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

probably he didnt know how to control it so he just screwed it up and then fixed it after it became obvious.
Forum: General Electronics Technical Discussion 11-19-2015, 10:01 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

it's not screws.
the grabber uses an electromagnet, the control system regulates win's by varying the current to the magnet.

early systems just had a "power" control.
newer ones monitor wins...
Forum: General Electronics Technical Discussion 11-19-2015, 07:11 PM
Replies: 146
Views: 11,877
Posted By stj
Re: Need help reading a schematic.

everything in fairgrounds is "regulated" in one way or another.
if you think that's bad, you should see how the cranes work!!!
i'll give you a hint - they are intelligent and can regulate the...
Showing results 1 to 25 of 42
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