Help identifying components

[Michael A. Terrell]

DaveC wrote:

I may have the answer, but No, I can't help you....

???

|----||----|
| DO NOT |
| FEED THE |
| TROLLS! |
|----||----|
||
||
||
/|\\|/||||//|||/\???\\//\\\\/|?\/\\\\/\/\/\||||\
--
Politicians should only get paid if the budget is balanced, and there is
enough left over to pay them.

 

[Randy]

On Sep 26, 3:56 pm, "Michael A. Terrell" <mike.terr...@earthlink.net>
wrote:

DaveC wrote:

I may have the answer, but No, I can't help you....

???

        |----||----|
        |  DO NOT  |
        | FEED THE |
        |  TROLLS! |
        |----||----|
             ||
             ||
             ||
 /|\\|/||||//|||/\???\\//\\\\/|?\/\\\\/\/\/\||||\
--
Politicians should only get paid if the budget is balanced, and there is
enough left over to pay them.

Cut it out Michael..
R.

 

[dcaster@krl.org]

On Sep 25, 12:59 am, DaveC <inva...@invalid.net> wrote:

What are they in? A little context would help.

The circuit is in a Hakko 472 desolder station. It controls the switching on
and off of the vacuum pump motor and vacuum solenoid valve.

Thanks.

I would trace out the circuitry. If you have that, then the type of
diode may be obvious. For example if a diode is across a relay coil
to eliminate transcients, then any ordinary diode will work. For a
circuit for a desolder station, I would expect all the diode would be
common diodes, no zeners, no fast switching, no germanium. Just
something like a 1N4004.

Dan

 

[Randy]

On Sep 26, 3:56 pm, "Michael A. Terrell" <mike.terr...@earthlink.net>
wrote:

DaveC wrote:

I may have the answer, but No, I can't help you....

???

        |----||----|
        |  DO NOT  |
        | FEED THE |
        |  TROLLS! |
        |----||----|
             ||
             ||
             ||
 /|\\|/||||//|||/\???\\//\\\\/|?\/\\\\/\/\/\||||\
--
Politicians should only get paid if the budget is balanced, and there is
enough left over to pay them.

Fix the sign or for pete's sake, Do Not Use It Again.
R.

 

[Michael A. Terrell]

Randy wrote:

On Sep 26, 3:56 pm, "Michael A. Terrell" <mike.terr...@earthlink.net
wrote:
DaveC wrote:

I may have the answer, but No, I can't help you....

???

|----||----|
| DO NOT |
| FEED THE |
| TROLLS! |
|----||----|
||
||
||
/|\\|/||||//|||/\???\\//\\\\/|?\/\\\\/\/\/\||||\
--
Politicians should only get paid if the budget is balanced, and there is
enough left over to pay them.

Fix the sign or for pete's sake, Do Not Use It Again.
R.

Responding just
encourages them!
\

')
( \

^^`
--
Politicians should only get paid if the budget is balanced, and there is
enough left over to pay them.

 

[neddie]

On Sep 26, 7:14 pm, "Josepi" <J...@easynews.com> wrote:

hmmmm... Now you are pushing my memory hard!!...LOL

Let's see.

Make a series circuit with the resistor (R) at the top and the component at
the bottom. Feed the whole thing with an AC voltage supply, top to bottom..

You will need a scope with horizontal input as well as the usual vertical
input and a floating ground or full differential input somwehere. (you work
out the logic .. maybe a floating AC voltage supply would be enough)

Hook the vertical input across the resistor and the horizontal input across
the component. Maybe the grounds together in the middle of components and
floating supply are good for that??? Been a few years.

Now your vertical trace on the scope indicates current (IR drop in the
resistor).
The horizontal trace indicates voltage drop across the component.
You will get the single curve of a component tracer on your scope.

***Component curves***
**shorted = vertical line
**open = horizontal line
**resistor same as R = 45 degree line
**capacitor = circle... me thinks round indicates matching impedance with R
at 60Hz??
** inductor = circle same as cap above??
**zener no current at lower voltages = horiz. line; no voltage increase at
higher voltages = vertical line = visible knee at zener voltage - use
calibrated scales for measurement
**avalanche diode = horizonatal line with foldback and shows current
(vertical at higher end)

Try it! So simple it stinks but is very visible clue. Watch your scope
grounding.

"DaveC" <inva...@invalid.net> wrote in message

news:0001HW.C8C40877035B8296B01AD9AF@news.eternal-september.org...
I got the scope, resistor(s). Variac + small transformer = variable AC
supply.

So describe away!

Thanks.

Even without the "variable" this can work. Use a high enough DC voltage..

There is a method with a scope, resistor and AC supply  but it is much
more
complex for a novice (assuming)

Sim this in LTSpice

Version 4
SHEET 1 880 680
WIRE 64 64 -16 64
WIRE 224 64 144 64
WIRE 256 64 224 64
WIRE -16 128 -16 64
WIRE 224 144 224 64
WIRE -16 272 -16 208
WIRE 112 272 -16 272
WIRE 224 272 224 208
WIRE 224 272 112 272
WIRE 112 288 112 272
FLAG 112 288 0
FLAG 256 64 Vout
SYMBOL zener 240 208 R180
WINDOW 0 24 72 Left 0
WINDOW 3 -145 31 Left 0
SYMATTR InstName D1
SYMATTR Value BZX84C15L
SYMATTR Description Diode
SYMATTR Type diode
SYMBOL res 160 48 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 47k
SYMBOL voltage -16 112 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value SINE(0 30 50)
TEXT -50 312 Left 0 !.tran 200m