Recent Posts

1

Beginners / Re: Comparator problem

« Last post by xvr on Today at 09:28:40 am »

> I tried to do it with a cap but somehow the comparator starts to violently oscillate when I assemble the circuit.

It should not. May be you place capacitor in wrong place? Please, provide us a schematic.

2

Microcontrollers / Re: Signal filtering - Could this work ?

« Last post by xvr on Today at 09:20:42 am »

> I agree from a math point of view but I had hopes it would kinda work just averaging.

If you hope that introducing a lot of extra math will magically solve your problem I have bad news for you - it will not 

I think that the first that have to do it's take long raw measurement from field and then find out best math (filters/DSP/etc), that will solve your problem (with something like MATCAD). And only after this start to implement algorithms in firmware.

3

Projects, Designs, and Technical Stuff / Using Wet SMD component (drop in water)

« Last post by MarkPham on Today at 09:19:32 am »

Hi everyone

Could you help with your experience for Using the Wet SMD component (drop in water)?

Can we continue use them for the assembly? What actions should be taken prior using?

What is the potential risk, hidden risk if we use the wet component?

I really need you sharing of exprience to learn.

Thank and Best regards

4

Test Equipment / Re: Enable FFT function on TDS210/TDS220/TDS224

« Last post by rh100605 on Today at 09:18:52 am »

Having seen the schematic for this board I was interested in how a small PLD decoded the UART and IEE488 chip selects to fool the scope into thinking they were present.
So I downloaded the OPAL suite of programs that includes a 16bit DOS program to reverse the .JED files to the original .PLD file that is compiled by WINCUPL from the Atmel site. I used a 16bit pc emulator (DOSBOX) to run the programs under Windows 10 and shortened file names to the old DOS 8.3 format.

The PLD file below has the same checksum as the one supplied by SD_tony when compiled by WINCUPL

/* JED2EQN -- JEDEC file to Boolean Equations disassembler (Version V002)
; Copyright (R) National Semiconductor Corporation 1990,1991
; Disassembled from TDSMM.JED. Date: 3-10-124
*/
Name     Name ;
PartNo   00 ;
Date     11/03/2024 ;
Revision 01 ;
Designer Engineer ;
Company  m ;
Assembly None ;
Location  ;
Device   g16v8 ; /*Library DLIB-h-40-11 ;*/

/* *************** INPUT PINS *********************/
/*PIN   1  =   CLK       ;*/ /* externally connected to IO5 */
PIN   2  =   i2          ; /*     D3                       */
PIN   3  =   i3          ; /*     A17                      */
PIN   4  =   i4          ; /*     Rd/not Write             */
PIN   5  =   i5          ; /*     A18                      */
PIN   6  =   i6          ; /*     A19                      */
PIN   7  =   i7          ; /*     A20                      */
PIN   8  =   i8          ; /*     not LDS                  */
PIN   9  =   i9          ; /*     not MS                   */

/* *************** OUTPUT PINS *********************/
/* PIN   20 =   VCC          ; */    /*    */
PIN   19 =   o19         ; /*     Not RAM                     */
PIN   18 =   o18         ; /*     Not ROM                     */
PIN   17 =   o17         ; /*     IO3                         */
PIN   16 =   o16         ; /*     IO4                         */
PIN   15 =   o15         ; /*     IO5                         */
PIN   14 =   o14         ; /*     IO6                         */
PIN   13 =   rf13        ; /*     Not connected               */
PIN   12 =   o12         ; /*     IO8                         */
PIN   11 =   !OE         ; /*     GND                         */

/*CLK i2 i3 i4 i5 i6 i7 i8 i9 GND
/OE o12 rf13 o14 o15 o16 o17 o18 o19 VCC
*/
/*
@ues 3030200000000000
*/
  /*equations */

! o19 = !i3 & !i5 & !i6 & i7 & !i8 & !i9 ;
o19.oe = 'b' 1 ;

! o18 = !i7 & !i8  & !i9 ;
o18.oe = 'b' 1 ;

o17 = i3 & i4 & i5 & !i6 & i7 & !i8 & rf13 & !i9 ;
o17.oe = 'b' 1 ;

! o16 = i4 & i5 & !i6 & i7 & !i8 & !i9
    # i3 & i4 & !i5 & i6 & i7 & !i8 & !i9 ;
o16.oe = 'b' 1;

o15 = i3 & !i4 & i5 & !i6 & i7 & !i8 & !i9;
o15.oe = 'b' 1 ;

o14 = i3 & i4 & i5 & !i6 & i7 & !i8 & !rf13 & !i9
    # !i3 & i4 & i5 & !i6 & i7 & !i8 & !i9 ;
o14.oe = 'b' 1 ;

rf13.d = i2 ;   /* !registered output */
/* rf13.oe = 'b' 1 ; */
o12 = i4 & i9 ;
o12.oe = 'b' 1 ;
/* *   checksum of original C4AA3     */

5

Test Equipment / Re: Siglent SDS800X HD 12 bit DSO's

« Last post by Antonio90 on Today at 09:17:55 am »

[...]

In my opinion/experience when describing products "features" i prefer to use "feature" for a "property or attribute", opposite to what Marketing does.
Sometimes word "capability/es" or "function/s" is better used.

Best,

Unsurprisingly, when trying to explain the nuanced meaning of something, you reverted to words stemming from Latin, which is one of the best technical languages. Formal Latin was technical, first and foremost. Sadly, I don't know German at all.
Maybe Sanskrit would have been as good.

My greatest problem with English, by far, is the verb "to be". It can refer to an essential feature attribute of a being, something that cannot be modified without fundamentally changing the being. It can also refer to a transitory, contingent or superficial state the being is currently in. The next step would be to use the same word for "yes" and "no".
But yeah, English is a quite good conversational language, not very good for science or rigorous speech.

On the flip side, it makes english technical writings much easier for those of us which speak languages stemming from Latin, as half the words are actually Latin and not English.

6

Repair / Re: Sony J30 PSU repair

« Last post by Harry_22 on Today at 09:17:35 am »

[B3] and R6 are in parallel (pls see the picture).

So you have to change Q1 and may be controller MC33262.
You can use MOSFET K3568 or CS10N60F as analog of  K3234. Of course you may to solder Q1 change fuse and switch PS on. But it is bad way.

Check the controller fist then connect external DC power supply as mains. Most PFC work from 60 VDC. This is safe way.

7

Test Equipment / Re: Siglent SDS800X HD 12 bit DSO's

« Last post by ebastler on Today at 09:15:42 am »

Sometimes word "capability/es" or "function/s" is better used.

That's how I would interpret the word "feature" in the context of the "SDS800X HD wanted features" thread: It's about suggestions for additional functionality.

8

General Technical Chat / Re: Do you think an LED is a resistor?

« Last post by m k on Today at 09:11:57 am »

If only tool is a wheatstone bridge...

9

General Technical Chat / Re: Do you think an LED is a resistor?

« Last post by Gyro on Today at 09:08:54 am »

A LED is not a resistor.

This is a resistor which can emit light:

Its operation has been studied and characterized too (attached, those happy days!).

10

Buy/Sell/Wanted / FS (EU) JBC DD-2A 2-channel soldering station control unit (230V)

« Last post by KhronX on Today at 09:08:45 am »

Selling a JBC DD-2A 2-channel soldering station control unit - a good few years old but fully functional, under 1200h actual work hours in total (see stat screens).

Bought used, and was in my personal use for a few months, until i got a great deal on a 4-channel unit.

No stands or handpieces are included, but i can provide an EU or UK mains lead.

Would prefer to ship within EU (25eu); open to shipping elsewhere as well, pending checking costs - customs and any other fees are the buyer's responsibility.

Looking to get ~400eu, but i'm open to offers 

Payment via Paypal, Mobilepay or bank transfer.