Chinese toys

[kt315]

did the toy. can check 555s' now.



first practical result. did check 555 from Phil's board. its good. did set in board but again no sound.

[kt315]

oops. it shows sure a type of IC and all its substitutes, not codes. so this tester is more advanced than i thought.

[kt315]

this is a signature analyser (sorry do not know how it is in english right). you see some serial sequence of the codes on the LED matrix.
remember and compare that with working IC same sequence. if matches you do a conclusion the IC is suitable.

[Koala]

does it not read it as a 74HC04

https://www.youtube.com/watch?v=KVdjDEA-q-4

with 74hct14

[kt315]

https://www.youtube.com/watch?v=KVdjDEA-q-4

with 74hct14

[kt315]

back side with mandarine. LOL.

http://ipic.su/img/img7/fs/CIMG6478.1551818323.jpg

[Andi68]

Thenk you kt

[kt315]

just got https://www.ebay.com/itm/Multi-Funct...53.m2749.l2649

[kt315]

https://drive.google.com/file/d/0B7B...RvMHQ2VXM/view

T12, controller parameter setting mode, PDF.

[dbanner]

if you are so mindcontrol find out a problem on this PCB http://ipic.su/img/img7/fs/CIMG6443.1550232208.jpg

somebody took being teaching me here... with experience from 15 years old in electronics. BTW i am now 57 -!!!!

I never said the device was useless, I said it was not absolutely necessary, nice to have but hardly ever used in real troubleshooting.
Luxury not necessarily indispensable. See?

[Andi68]

You can always use this tester.
Very handy for J-Fets, Mosfets, Transistors-just plug in and check.
Also good for parts that should be used again from old boards
And even with new Elkos the ESR can be different

[kt315]

if you are so mindcontrol find out a problem on this PCB http://ipic.su/img/img7/fs/CIMG6443.1550232208.jpg

somebody took being teaching me here... with experience from 15 years old in electronics. BTW i am now 57 -!!!!

[dbanner]

Nobody checks ESR of small voltage, cheap electrolytic capacitors in old metal detectors. They simply replace them with new ones as good best practice, including all tantalum. MOSFET transistor have predictable signs that they are compromised.
Fancy tester is luxury not necessity.
Before installing new capacitors, check each one against the other of same value for suspect defective one, it will show up as anomaly on ordinary multimeter.

[kt315]

every vintage detector needs ESR checking of all electrolitics. you can not be out from this tester. also no way to check a mosfet by ordinary tester.
you have to see the advantages. https://twitter.com/jburdeezy/status...12564980301826

[dbanner]

received the tester. pics https://www.geotech1.com/forums/album.php?albumid=113

Looks good.