sp-codes PeerTube

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sp-codes PeerTube episodes

  • Keri's RevEng Mission 2: Pulsar MP-13.8/1A(3A) Alarm PSU

    A linear power supply of the stand-by type, used in alarm and video monitoring systems. The LM317 in a typical voltage regulator configuration, a current limiting resistor and discharge diode for the battery, and some state indication - that's all! A very simple and nice module.

    Sorry for the abysmal lighting here and camera losing focus all the time. It's out-of-the-lab field setting where I have to improvise a lot more than I normally do.

    Schematic: https://yt3.ggpht.com/60Vpl0YAIBPjAsduSpPwUdxDdkavAyFxhOaQwBMc1GJqRVuJf255b0ZTzayvWfQpD1GgNii_nMJc=s640-nd-v1

    Support me on my Patreon page at https://www.patreon.com/KeritechElectronics

    Instagram - https://www.instagram.com/KeriSzafir
    Telegram channel - https://t.me/KeritechElectronics

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  • B13S8 - A Huge East German Cathode Ray Tube

    Just got one from a local electronic parts shop! Brand new in a box, and it even has a warranty ticket. What am I gonna do with it? Not sure... but it's a nice addition to my collection.

    Support me on my Patreon page at https://www.patreon.com/KeritechElectronics

    Instagram - https://www.instagram.com/KeriSzafir
    Telegram channel - https://t.me/KeritechElectronics

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  • Joan Lambert: Trans or intersex?

    Joan Lambert, the navigator on Nostromo and the penultimate surviving character in Alien, was recently hailed as an example of trans representation: https://www.pinknews.co.uk/2021/02/04/alien-trans-character-joan-lambert-veronica-cartwright/

    She had a bottom surgery in a very early age, but does it mean she was trans? She definitely would be if she had it at some point in her life as one of the steps in her transition, but getting one right after birth means that either the parents wanted a child of different gender, or she was intersex, had a "normalizing" surgery and was coercively assigned female at birth. This is still done today, and no one except for intersex people's rights activists seems to give a shit...

    Congrats @NASA on the Artemis launch - we're getting there. Again!

    Support me on my Patreon page at https://www.patreon.com/KeritechElectronics

    Instagram - https://www.instagram.com/KeriSzafir
    Telegram channel - https://t.me/KeritechElectronics

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  • Record unboxing: David Bowie - Hunky Dory

    An old video (definitely 2021; see me with no bangs and no funky knife?) that got posted on my deadname channel rather than this one. Another surprise record unboxing, this time it's good old David Bowie. Ch-ch-changes!

    No real deal mike, all recorded with a mobile over the workbench. Oh, and the SN34/1 stereo amp I was building back then.

    Support me on my Patreon page at https://www.patreon.com/KeritechElectronics

    Instagram - https://www.instagram.com/KeriSzafir
    Telegram channel - https://t.me/KeritechElectronics

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  • Keritech Stream - Spinal Tap Edition

    Back with a vengeance! No amount of harmonic distortion will stop me from doing that stream. So, let's have some action with the Tektronix and some other stuff...

    Support me on my Patreon page at https://www.patreon.com/KeritechElectronics

    Instagram - https://www.instagram.com/KeriSzafir
    Hackaday - https://hackaday.io/keritech

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  • Treble Trouble! Marantz SD-62 tape deck cleaning and adjustment

    This lovely deck is feature rich, with 3 heads, bias adjustment, Dolby HX Pro. It was made in the early '90s in Japan. Also, it has a linear tape counter, which got me curious how that's done (referring to @vwestlife episode on tape counters https://www.youtube.com/watch?v=-cy032-eB2I) but since I was not taking the mechanism out, I didn't figure out the sensor type and its placement.

    More info on this model: https://www.cassettedeck.org/marantz/sd-62

    0:00 Intro

    1:50 Tape door
    2:40 Cleaning the mechanism
    5:13 Testing
    6:22 Head adjustment
    9:58 Taking off the cover
    12:52 The inside
    16:00 VFD and controls
    20:10 No fuse?
    22:10 Putting it back together
    24:01 Conclusions

    Support me on my Patreon page at https://www.patreon.com/KeritechElectronics

    Instagram - https://www.instagram.com/KeriSzafir
    Telegram channel - https://t.me/KeritechElectronics

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  • Record unboxing: Rant'n'Rave with the Stray Cats!

    Unboxing a surprise gift from my queerfriend. Time to revv up those engines and rock'n'roll, kitties! That's the third Stray Cats album in our collection.

    Support me on my Patreon page at https://www.patreon.com/KeritechElectronics

    Instagram - https://www.instagram.com/KeriSzafir
    Telegram channel - https://t.me/KeritechElectronics

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  • Various Tidbits and Teardowns #1 (and rants too!)

    Showing you some interesting stuff and experiments that wouldn't make their own episodes, ranting about shitty products.

    0:00 Intro

    0:25 Sagem wall wart
    2:25 First rant
    3:30 Cheap-ass microphone cable
    4:50 Second rant
    6:11 6.3mm (or 1/4" ) jack comparison
    12:10 Ferrite core transformer... for audio applications?

    Don't mind the beeping. It's just my oscilloscope that has its quirks, it's not THE BOMB (I'm not doing a collab with EEVBlog on that AtEx leakage sensor, ha!).

    To conclude, these transformers won't go over midrange, which disqualifies them in their current form. It may be because the impedance rises dramatically with frequency and 5k is where it begins. The leakage inductance lowers the transformer's frequency response and it apparently is a problem here, with the split spool and gaps in the core.

    I'll be doing some more experimenting, only using fully covered ferrite pot core, and litzwire for the multifilar windings to reduce the leakage inductance. Hope that's gonna get me somewhere...

    Support me on my Patreon page at https://www.patreon.com/KeritechElectronics

    Instagram - https://www.instagram.com/KeriSzafir
    Telegram channel - https://t.me/KeritechElectronics

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  • The other Keritech... is it even Keri?

    I'm not the only one, but are others even named after my namesakes?

    http://www.keritech.com - not Keri

    https://www.keritech.net - a different one, still no Keri in sight...
    http://www.keritech.co.nz/ not Keri either! but it's in Kerikeri, NZ
    Gotta work on that website and buy a domain...

    Support me on my Patreon page at https://www.patreon.com/KeritechElectronics

    Instagram - https://www.instagram.com/KeriSzafir
    Telegram channel - https://t.me/KeritechElectronics

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