sp-codes PeerTube

sp-codes PeerTube

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sp-codes PeerTube episodes

  • Hospital Loveliness! Statham Blood Pressure Monitor

    Teardown, fireup and experimenting a vintage medical electronics device - the Statham SP-1401 blood pressure monitor used in hospitals. Impressive build quality, the true art of electronics... Will I get anything out of those Nixies? See for yourselves!

    0:00 Intro

    1:45 Pin Nuts
    2:40 Use Case
    4:38 PCB Design
    6:15 Nameplate
    6:44 Back Panel
    7:26 Front Panel
    11:00 Inside the Device
    14:05 More Electronic Engineering Goodness!
    14:49 Power Connections
    15:45 Cannon Probe Connector
    17:15 Hooking Up the Power
    20:17 First Fireup!
    20:45 Fiddling with Controls
    24:15 Output/Input Disconnection Experiment
    28:30 Looking for Signal Input
    31:30 Experimenting!
    40:00 Nothing Happens?
    41:00 Oops! False Positive...
    42:20 Got it!
    43:10 Measurements
    45:25 Board Investigation

    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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  • Old Style Cable Lacing Techniques

    Showing you a few cable lacing techniques, correct and incorrect. NASA, vintage, complete crap and what I used to do but NASA style proved better.

    This video was inspired by The Digital Mermaid's one: https://www.youtube.com/watch?v=Bg2vh_X6MgM

    ConnectionsMuseum also did one: https://www.youtube.com/watch?v=GTC_r9AIgdo

    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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  • Thyratron Fun! AEG Time Relay Reverse Engineering

    Time circuits set to 3 seconds in the future!

    I got this AEG time relay from my friend and decided to show its interesting build and principle of operation. It uses a 150V voltage regulator (probably 0A2) and an unknown type thyratron (may be 5823), and interesting latching circuit on the main relay.

    A thyratron is a gas-filled triggered tube which starts conducting after applying voltage to its ignition pin, and will keep concucting until the plate voltage drops below a certain threshold, in practice until power is disconnected. It's a glass-and-metal cousin of a SCR (semi-conductor relay) a.k.a. thyristor. Even the name is related.

    0:00 Intro

    1:10 Mysterious Device
    2:20 Tubes
    5:06 Teardown
    6:20 Schematic and Principle of Operation
    11:35 Fireup
    14:23 Measurements
    17:00 Afterword

    I changed the thumbnail font BTW. Wondering how it affects the views, haha!

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

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

    0 min
  • Keritech Tube / Solid State Hybrid Bridge Rectifier

    My little contribution to the guitar amp industry - I hope... Contrary to Randall Smith, I'm not patenting anything. Being an anarchist, I firmly believe in freedom of information, science and technology. Take that, Messy Booger!

    While the hybrid bridge rectifier has been around, same for switchable full wave (not full bridge) rectifier like you see on the Messy Booger DR, my switchable hybrid bridge may be a new idea, with a cap bleeding circuit, and the circuit is also protected against excessive load on the rectifier tube.

    0:00 Intro

    1:25 Directly Heated Tubes and Large Filter Caps - WTF?
    4:25 Indirectly Heated vs Directly Heated
    5:30 Hybrid Rectifier (Nothing New)
    7:50 Why Tube Rectifiers Anyway? Power Supply Impedance
    10:15 Diode and Bleeding
    15:00 Afterword

    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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  • Sochor DRX85 Reverse Engineering - Complete!

    Another video on the DRX85, this time it's fully reverse-engineered. It took me two weeks to track every trace and component on the pretty complicated board, all done with no computer assist, taking notes on paper and drawing the schematics. Double-checking any WTF while also learning about the inner workings of analog-to-digital and digital-to-analog conversion. And all this insanity was built in 1986 - the same year Challenger crashed, Chernobyl blew up and I was born!

    0:00 Intro

    2:47 Shine Some Light
    7:40 Other Board Examples
    9:52 Block Diagram and Panel Overview
    13:37 Bypass and Dry/Wet Mixing
    14:27 Analog Section - Input
    19:50 Echo/Reverb DAC Killer
    21:07 Analog Section - Output
    22:12 False Bypass?
    25:00 It Was Madness!
    25:59 Time Circuits
    29:47 Changeover DAC Killer
    30:40 Time Circuits Logic
    33:07 A Trip Down The Memory Lane
    35:47 ADC and DAC, Digital Feedback
    45:00 Covers Go Back!
    48:27 Some Conclusions
    50:20 Let's Make Some Noise!
    52:33 Thrash Metal Can?

    Planning to make another video where I'll go over the inner workings of the digital part. Of course, after I get a grip on it 😃

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

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

    0 min
  • Keritech DD-12 "Dirty Dozen" Amp - Part 4: Mechanical Assembly

    Watch me as I populate the chassis of my new Dirty Dozen guitar amplifier! Solving problems along the way, because I couldn't just predict everything, right?

    ...right?

    0:00 Intro

    0:50 Chassis overview
    2:10 Fuse Holder Hole
    10:10 Mains Transformer
    17:10 Output Transformer
    26:30 Terminal Strip
    41:25 Oops!
    45:45 Pilot Lamp and Fuse Holder
    50:55 Tube Sockets
    1:01:40 Wrapping Up

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

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

    0 min
  • Keritech DD-12 "Dirty Dozen" Amp - Part 2: Drilling

    The chassis fabrication part of making the amplifier! Drilling the holes, cleaning up, preparing the rectrangular holes for transformers and mains connector.

    0:00 Intro (and Rat-O-Caster update)

    2:28 Pilot Hole Drilling
    9:10 Front and Back Panel
    18:40 Tube Socket Holes
    23:50 Recombobulation and Deburring
    33:35 Jack Holes
    48:20 More Deburring
    51:55 Tube Socket Fitting
    57:07 Tube Socket Screw Hole Drilling and Deburring

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

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

    0 min
  • A Life-Changing Experience! Reviewing "Open Circuits: The Inner Beauty of Electronic Components"

    That's it! A book copyrighted in 2023 on my bench in 2022.

    0:00 Intro

    0:45 About the book
    2:25 How I got it?
    4:00 Cover and foreword (and cat)
    7:20 A few words on design and engineering
    9:55 Chapter 1: Passive Components
    25:47 Chapter 2: Semiconductors
    34:49 Chapter 3: Electromechanics
    40:00 Chapter 4: Cables and Connectors
    45:32 Chapter 5: Retro Tech
    1:02:50 Chapter 6: Composite Devices
    1:09:11 Afterword, or how the book was made
    1:12:11 My Verdict

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

    Instagram - https://www.instagram.com/KeriSzafir
    Telegram channel - https://t.me/KeritechElectronics
    Hackaday - https://hackaday.io/keritech

    0 min
  • VCF East Livestream RANT!

    Ranting about the livestream being essentially deadstream...

    For all those like me, who can't be there for any reason. I wish I could.

    Livestream link: https://www.youtube.com/watch?v=4UAUG7yR_dA

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

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

    0 min
  • Rat-O-Caster: Recombobulation [2/2]

    Restringing, tuning and adjusting the measure on my Washburn X-10 Pro "Rat-O-Caster" guitar. It's actually starting to look and sound decent... This machine supports trans rights and kills fascists!

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

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

    0 min

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