According to the date codes of parts manufacturing date is 1980. Therefore this is a design of 70s.

Reverse engineering" refers to the process of taking something apart or analyzing it in detail to understand how it works, what its components are, and how they interact. Here's a breakdown of what it typically involves: Deconstruction: Physically or virtually taking apart a product or system to see its components. This could be hardware, software, or even processes. Analysis: Functional Analysis: Understanding what each part does and how it contributes to the overall function. Structural Analysis: Examining how parts are connected or interact with each other. Documentation: Creating detailed diagrams, schematics, or code that represents the original design. Reconstruction: Sometimes, after understanding the system, one might rebuild it or create a new version, often with improvements or modifications. Understanding the Logic: In software, this might involve decompiling code to see the logic and algorithms used.

google it

NE5534: before designing the HM8118 I did the reverse engineering of several LCR meters from different manufacturers and all of them use this op-amp for the TIA... One LMH6321 is used for the test signal generator, the second one is used for buffering the output of the NE5534. at 5:00: "here you have the buffer for the Hcur signal", it is the LMH6321. at 5:00: "this is the multi-slope ADC" I don't have any TL081 on my original design, maybe R&S has changed this part for some reason. There are two single op-amps on that design, I think you refer to the one connected to the LMH6321, pin 6 of the op-amp to pin 1 of the LMH6321. Pin 2 is the feedback connected to pin 9 of the analog mux DG409 which permits to select between different source resistors. You can change this DG409 first. We can discuss by email to avoid long discussions here. Michel.Waleczek (at) gmail.com

@@lelabodemichel5162 I will check the DG409 and respond as I have traced the error back further. THX

Design of instruments is my speciality.

Yes I do, my parents were born in Poland.

No, I draw the schematic directly from the pcb. I use a continuity tester with sharp needles when the tracks are not visible or covered with conformal coating like this one.

PADS Logic

​@@lelabodemichel5162 Thank you so much. I will tell you the thing with these guarding tracks connected to the opamp output in the inverting configuration and not to the ground. In the schools of eastern europe they teach that the virtual earth point (after the input resistor) has some resistance as well, and if some noise will be picked up by this point it will be hugely amplified by the feedback resistor. The signal that comes from opamp output that is inverted is meant to keep the noise level at minimum because if any gain of such noise will occur at the opamp output, it will be effectively attenuated, as it is the same noise as at the virtual earth point but inverted, and that would be the effect of capacitive coupling between the guard track and earth point. If connected to ground, still the common mode noise could be amplified but not attenuated then, and if any noise will be picked up by the ground it could be easily translated to the opamp output causing errors. It is another thing if by these impedances that theory is valid but this is how mostly the russian engineers are trained.

A guarding has nothing to do with noise. It permits to avoid leakage currents due to pollution on the board. Leakage currents return to the guarding track and not to the sensitive track. If you have a voltage present between the guarding track and the track itself it will increase dramatically this leakage current. Difference of potential should be minimum. Furthermore on that board you have all combinations, you don't have the same guarding track connection for same configuration. Anyway guarding tracks are not required with such resistors values.

Capacitors are not the same than TVs or video machines. It is a wet tantalum, K52-1B type: elecond.ru/pdf/k52-1b_en.pdf The storageability is an important parameter, 20 years for this one.

General Radio type 107-K, I have the 107-L model also. See page 43: www.ietlabs.com/pdf/GR_Catalog/GenRad_CatG1_1932.pdf

Ракета носитель ядерки 😂

Да классика 90х-нулевых. Эта хрень всплывает периодически, в защиту скажу что британские ракеты тоже большой мем о том как разводят чукотских юношей на агитку. Просто эта фигня скорее всего прошла весь цикл испытаний, а требования к плате по ходу были достаточно низкие. Оно летит, поражает цель, иногда ломается и тогда достают еще пару ракет, все равно их делают массово. Для носителя ядерного оружия требования сильно проще, как у точки-у КВО было 3км, но плевать потому что ядерный взрыв примерно где и надо. В военке требования о высокоточности это сравнительно недавняя тема, те кто наводят цель порой сами представления имеют о том чтоб пульнуть где-то в той стороне или где-то в том районе. Иногда надо попасть по мосту или по зданию, тогда уже вот да. Конкретно эта плата явно делалась просто вчерашним студентом и прошло испытания.

@@user-nz8rv8ft5q каких нулеввых, начало 80х.

​@@user-nz8rv8ft5q, да как сказать, про "". Первые эксперименты с управляемыми боеприпасами начались в конце Второй Мировой войны. Немецкий "", американский "", то, что вспомнилось сразу. Понятно, что автономные системы наведения набрали популярность гораздо позже, но высокоточное оружие это ни разу не недавнее изобретение. Вояки о нём мечтают испокон веков. Что касается "". Может быть оно и так, лишь выполняла свою функцию, но чёрт побери, технологичность! Её изготовление это же настоящий кошмар! Жгут непонятный, изолента, стяжки, поточечная пайка... Масса ненужных ручных операций, каждую из которых можно сделать через одно место и сломать всё изделие целиком. С другой стороны, если переделать этот узел, то наверняка зацепит и соседние, придётся перебирать и их "ripple effect". В результате придётся переделать чуть ли не всю начинку. Поэтому "работает - не трогай".

vot, vot - rashka 564oj serii.. LA4, LA3, TM2 itp

After some researches it is from a 9E420 radar seeker, 9M317 missile and probably others.

It is from a Buk system, likely a semi active radar seeker from the 70's.

Yes, it was the oscillator. I don't know why, the power is quite small and the frequency not too high. It is the same for the guarding tracks, totally useless with the resistance values used in that circuit, when the guarding tracks are correctly placed.

I don't think so, it can be used for so many different things. I don't know how many boards are present on that missile, it should be impressive.

​@@lelabodemichel5162they have a lot of these. Even a practice of using connectors is kinda difficult to convincing people. This wire harness is actually reliable, but require a lot of manual labour. But who cares? A couple of extra women will get a stable job on a military factory.

I was thinking of the proximity fuse : this frequency can be use to generate the pulses of the high frequency radar?