LDM

[@tpa6120a2dwp]

Thank you for filming this, especially the detailed analysis of the circuits. Due to the secrecy around such systems I always imagined them to be a lot more complex and advanced than they actually are. Amazing to see how simple and straightforward the electronics are, pretty much what one would expect.

[@glmm2001]

By the shape seems to be an early model, so designed in the later 60 and produced into the early 80s.

[@tHaH4x0r]

Beautiful circuits, with almost all transistors. It says a lot about what time period the missile was designed (before widespread use of opamps). Nowadays all of the functions would just be plopped into a uC or ASIC. But I do love the elegance of just a couple of transistors and passives to get a relatively complex behavior.

[@scriptguru8]

Fantastic work! Thanks for producing the diagram and explaining it in detail.

[@StreuB1]

The strange looking brass device is a pyrotechnic relay. 🙂 Love your channel!!!

[@naderhumood]

Lovely video Sir. Thanks for posting this subject...v informative and interesting....this the firs class of work...its really great pcb stuff.

[@chedokichedoki1989]

This is priceless. Thank you!

[@christopherleubner6633]

Some of those TO3 devices mightbe itty bitty relays, as i have seen them on missile boards. They work great for stitching stuff in audio and lower frequency RF gadgets. The atlas part is an acceleation dashpot timer. It prevents the warhead from arming until a certain g force for time is exceeded. ❤

[@markhrabe8887]

The actuators for the TOW missile are actually pneumatic. There is a high pressure gas bottle and 4 solenoid valves. 2 for the pitch and 2 for the yaw. When the solenoid valve is engaged gas is fed to one side of a piston that moves the control surface.

[@lelabodemichel5162]

Yes, it is compressed helium.

[@cgourin]

This Atlas part is strange, if I had to guess I would say this is the safety/sequencer, something along the inside of the tube changes or moves with G-force, opening and closing gates to arm the missile at safe distance. Gate is closed because the missile has been fired and therefore been armed, the drawing might show flight seconds. Just a guess.

[@lelabodemichel5162]

It is probably something like that but I think that the numbering is just the order of the sequence. The duration of actions in the missile are shorts, for instance the duration of the flight motor is 1.5 second only. At the end the sequencer input control is probably short-circuited in order to have a single sequencing process for safety purposes.

[@cgourin]

Further guess: TOW has a double shaped explosive charge to defeat active armor, therefor the missile needs to trigger the charges in a rapid yet precise sequence, the impact would then move a mass inside opening/closing gates that would eventually end up in the back. This part could be tailored to the right timing for different war heads.

[@cgourin]

@@lelabodemichel5162 This game is fun! I remember playing it as a military on the navy Island Le Levant against all rules and common sense, dismantling an anti-submarine sonobuoy to be dropped from the air: an aluminum cylinder with winglets that rotates to stabilize the fall and being torn off entering water, that would free the antenna, release an amazingly strong yellow die to mark the spot and unravel a long elastic tether with two hydrophones at different depth that could be set prior to deployment. Inside you would find an empty lead battery that would fill with sea water and power the small transmitter. A beautiful work of engineering of simplicity, functionality and reliability. Not knowing what it was at first I had a big scare when I triggered the antenna that snapped out in my face :-o

[@lelabodemichel5162]

I had the answer from someone: this is a pyrotechnic relay. Delay of action is 0.065s on this one. Contacts are activated by little explosive inside. This thing can be found from Eaglepicher company.

[@cgourin]

@@lelabodemichel5162 Makes sense, nice channel

[@mikkolankinen3330]

Thanks Michel for interesting analysis. I'm curious about input filter design. As an RF engineer I find it strange. If you need a low or high pass filtering it can be implemented with a simple LC circuit. Why do you need transistors? Unless this is a filter with integrated signal amplifier? Do you have any thoughts?

[@lelabodemichel5162]

You can do it using inductors and capacitors but the values would be large for such frequencies and I guess that weight and size is an important matter. The filters use Sallen-Key low and high pass active filters and band-pass filters too.

[@foxxy46213]

Looks like it got buried in the dirt after firing an picked up a few years later

[@igorrizvic6008]

Oh this is sequentional....selective target..next gen stuff...cool video...bye

[@xileiyang1201]

Dear Michel，I'm your loyal fan，I'm from China.I like watching your videos very much, and there are many people in China who like watching your videos.But because there is a firewall in China. We can't watch your videos on KZbin.This is a disappointing result.Can I ask you to allow me to move your videos to Chinese video websites?On the bilibili video website, I indicated the source and author information of your video.And try to translate your video into Chinese.Could you agree to my request for reprint?

[@lelabodemichel5162]

You can, no problem.

[@xileiyang1201]

@@lelabodemichel5162 Thank you very much. Your video has many fans in China. The playback of each video I reprinted is higher than that of KZbin. Do you have your contact information, email, etc

[@gunlover92]

@@xileiyang1201 i bet you guys will love these videos. your always copying others obsolete military tech and calling it your own :)