For sale bare boards for Delta Pulse/Sniffer XR-71

[kt315]

... table

[kt315]

just Belarusia yet does chips and electronics. now you have know why pr Lukashenko is the enemy of capitalistic world.

http://tec.org.ru/board/93

KR574UD1 http://tec.org.ru/board/kr574ud1a/93-1-0-2399
http://tec.org.ru/_bd/23/2399_KR574UD1A_B.pdf - slew rate 50V/us

[kt315]

https://www.ebay.com/itm/AD845SQ-883...EAAOSw3YNXYFNV

beauty. ceramic capsulized... i think it for military/cosmic use/space... probably selling last batch of AD845 USA made.

[kt315]

from http://www.diod.club/forum/topic.php?forum=1&topic=33

added a simple generator to his model for measuring the static parameters of the op-amp to evaluate the speed of the op-amp. By observing the signal at the output of the measured op amp with the help of an oscillograph, it is possible to evaluate its speed, comparing it with the signal of a known original op amp. In this way, you can identify fake and re-tagged. So I found out that AD8512BRZ is the tagged TL082, and TL082C, in turn, is the LM358.
Fortunately, there are also originals.
For the collection of statistics, took out all the opamps of the 80s, which are obviously original, because they were made in such countries as Spain, Portugal, Mexico, Korea, and then China was still a backward country.
Interestingly, the fastest was the LM308A, to which this parameter is not normalized. LF357 and K140UD26 did not lag far behind. middle: AD8512, LM833 and among them zatesalsya D4558 firm CHMC - I do not know this. From the manufacturer, there is a strong dependence.

[kt315]

last revision of his stand for measuring of all parameters of opamp

[qute1]

Thanks KT315 a wealth of information there!

[dbanner]

At relatively low frequency for pulse induction, the important consideration is fast recovery from saturation. Also if opamp can operate rail to rail or no. And of course, the offsets, bandwidth, noise etc. Depending on requirements of circuit.
It seems like all chips have fake counterparts, all that is required is reprinting the writing on the chip.
Best way to avoid this problem, buy only from reputable suppliers in US or EU. Or even RUSSIA!

[dbanner]

Testing characteristics/parameters of an opamp is a sophisticated task, many of whom are not capable for average hobbyist. This is for the engineering geeks, not for average hobbyist.
Must have good waveforms generator and quality Digital oscilloscope and multjmeter for testing. But just to separate fake from original, just compare ohmic reading between pins of fake and real. This should be sufficient to separate goat from sheep.

[kt315]

just reminder.

i will stop to sell the boards on winter. you have to order now.
i ordered the batch for concrete people but they refused to buy. IT IS HARD LESSON FOR ME AT FORWARD.
i will also take the half price like pre-order. i do not want to do same mistake again.

you have no moral, no conscience, no honesty - do not write me.

[kt315]

guys

i do not sell the boards from October. no more winter project. i sent before xmas and they GOT LOST. so BUY NOW.

[tenere750]

hello kt315 I want to order delta pulse legend v 4,0

[kt315]

perfect choice buddy - to do a project in cold time (while Greece cold time is +20 grad Celsium).

just 14 euro for bare board. 2 euro if you want yet high voltage diode to put. op amp tester board wishing? it is good to check all kind of opamps
if you have a problem on DP, still 2 euro.
write me PM.

thank you

[kt315]

my buddy on vacancy in Greece

[kt315]

[nonkapo]

guys

i do not sell the boards from October. no more winter project. i sent before xmas and they GOT LOST. so BUY NOW.

Do not make this mistake again. For 10 years on ebay and a bit less on Aliexpress i never have lost item. This year i made mistake to order in the holiday season(january february where the chinese new year fell) and guess.... Three items do not arrive. For two i get refund but the thirt one was total loss. Avoid at any cost the time betwenn the christmass and chinese new year.