#video on how Randy Tundidor’s murder #crime was traced back to him because his brother Shawn betrayed him and his father to the police
#video on the 02005 murder #crime of the Groene family in Idaho, except for 8-year-old Shasta, who talked murderer Joseph Duncan out of strangling her and then talked him into taking her to Denny’s in her hometown. She spent her teens imprisoned.
#video on testing fired-clay #ceramics and books for stopping hatchets and rubber bullets for armor
#video on #electronics #hardware of a synchronous dc-dc converter by #GreatScott. First, for comparison, he rigs up a simple buck converter, whose switch is an IRF5305 p-MOSFET with its gate pulled up to Vcc (12V?) by a 100Ω resistor or down to ground by a BC547 with a 220Ω base resistor; the freewheel diode is a rather large 1N5822 Schottky (½W?), and the output capacitor after the hand-wound 100μH inductor is a 330μF electrolytic. The BC547’s base is driven by a knockoff Arduino Teensy generating an 80kHz PWM signal. So he replaces the freewheel diode with an IRFB3077 p-MOSFET to cut the power losses from 40mW at 400mA to about 0.4mW. To ensure dead time and avoid shoot-through, he drives the MOSFETs with an IR2184 half-bridge MOSFET driver chip and nine passives it apparently requires for its gate-drive network for some reason. He got 92% efficiency in CCM.
Thayne Ormsby’s four-hour interrogation and confession of a triple murder #crime in 02010 killing Jeff Ryan, his teenaged friend Jason Dehann, and Jeff’s young son Jesse Ryan with a knife in Amity, Maine, edited into a 70-minute #video
#BreakingTaps #video on small rolling-contact joints when ball bearings won’t fit. He holds the joint together with Dyneema tendons under tension (“Hercules” brand PE braided fishing line), rolling through the joint like a Jacob’s Ladder toy (magic tablets, Chinese blocks, Rubik’s Magic). He’s left channels in between the rolling contact surfaces to pass the fishing line through. So essentially the joint is sewn together.
#video about skinhead Sherri Graeff #Papini’s #crime of faking her own kidnapping #true-crime
#video interview with serial killer Ed Kemper including discussion of his #crime #toread #true-crime
skinhead #Papini’s racist manifesto. #true-crime