EEVblog

Following in from the DC circuit fundamanetals series starts the AC circuti fundamentals series. This part 1 looks at: – What is Alternating Current – How AC is created using a generator – Angular Frequency – The sinusoidal waveform, benefits and downsides – Average, peak, peak to peak, and RMS waveforms, calculation and conversions. – ...

Random teardown from the lab, a Sennheiser EW100 true diversity wireless microphone receiver. Plus an explanation of how antenna diversity works. Transmitter and camera receiver teardown: https://www.youtube.com/watch?v=dFvN04Woihk Gary: https://twitter.com/Gary43696951 Forum: https://www.eevblog.com/forum/blog/eevblog-1416-random-teardown-sennheiser-ew100-true-diversity-receiver/

Reverse engineering the Micsig DP10007 high voltage differential probe. Turning the PCB into a schematic. Forum: https://www.eevblog.com/forum/blog/eevblog-1415-reverse-engineering-the-dp10007-differential-probe/ Reverse enginering how-to for the Rigol oscilloscope: https://www.youtube.com/watch?v=lJVrTV_BeGg DIY light box for PCB photography: https://www.youtube.com/watch?v=6ZH2KeplSrs

Can Dave destroy the Micsig DP10007 high voltage differential probe by turning the voltage up to 1100V RMS? Plus a teardown of course. https://www.eevblog.com/product/hvp70/ Forum: https://www.eevblog.com/forum/testgear/new-eevblog-hv-probe/

Teardown and measurements with the Micsig CP2100B 2.5MHz oscilloscope current probe. Also a demonstration of mains switch mode power supply current and noise measurement, and also some performance tests. Use the coupon code FLUX for 15% off! And paying with crypto gets you a further discount on top of that! https://www.eevblog.com/product/cp2100b/ Or get the cheaper ...

Dave tears down the 10W Coherent 300C Argon Ion laser. All 42kg, 1.2m and 24kW worth! The App Hour podcast episode: https://theamphour.com/521-outdoor-laser-projection-object-mapping-with-daryl-tewksbury/ Forum: https://www.eevblog.com/forum/blog/eevblog-1412-argon-ion-laser-teardown/

Mailbag! Froum: https://www.eevblog.com/forum/blog/eevblog-1410-mailbag/ SPOILERS: 00:00 – Dancom RT403B 25W VHF Marine Transceiver teardown. 09:07 – Workbench of the week, Tony Albus: https://www.youtube.com/channel/UCwLPcv2xiA3D9lfGArF58ww TEA: https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/ 12:36 – Riedon SSA-100 100A Differential Isolated Current Sensor. https://riedon.com/ https://www.digikey.com/en/products/detail/riedon/SSA-100/12149327 22:19 – DODGY! Soviet era mains rechargable torch 27:36 – Jon Newcomb’s Microcontroller Proto Boards https://www.ebay.com/usr/jon_newcomb 33:57 – Affable Snake ...

A practical demonstration of Lenz’s law and back EMF in an inductive relay coil and how to solve it using a Freewheeling/Flywheel/Flyback/Snubber/Clamp diode. Also the downsides of clamping diodes, and switch arcing supression. Also a look at an AMAZING potential phenomenon you probably haven’t seen before! Actually, two rather cool things you probably haven’t seen ...

WiGL have raised almost 5 MILLION dollars on StartEngine. What’s worse than another wireless charging technology startup? – One that doesn’t really have any original technology and simply uses off the shelf RF energy harvesting chips! This one is just embarrassing. And they want to comepete with Energous, WiTricity, Ossia and others, LOL. For a ...

No Script, No Fear, All Opinion

The conclusion of the DC circuit fundmentals tutorial series. How a capacitor and inductor works, parallel and series configurations, exponential rise and decay, time constants, and basic differential calculus. Energy storage in capacitors and inductors and how a collapsing inductor magnetic field can be both a problem and a benefit. Forum: https://www.eevblog.com/forum/blog/eevblog-1406-dc-circuit-transients-fundamentals/

A side-by-side teardown of the Focusrite Scarlett Solo and the Rode AI-1 USB audio interface.

The HP9845B 16 bit computer was revolutionary in 1979 and the early 1980’s, find out why. The 9845C colour version of this created the amazing war room images for the movie War Games Forum: https://www.eevblog.com/forum/blog/eevblog-1404-the-amazing-hp-9845b-computer/

Teardown of the new NGA100 100V 2A NGA142/NGA102 Lab Power Supply, and a look at a few issues found. PLUS a GIVEAWAY of two units! https://www.rohde-schwarz.com/hk/products/test-and-measurement/dc-power-supplies/rs-nga100-power-supply-series_63493-959872.html Forum: https://www.eevblog.com/forum/blog/eevblog-1402-rohde-schwarz-nga100-psu-teardown-giveaway/ Forum GIVEAWAY: https://www.eevblog.com/forum/contests/giveaway-rohde-schwarz-nga102-psu/ Schools/Makerspace GIVEAWAY: https://www.eevblog.com/forum/contests/schools-makerspace-giveaway-rohde-schwarz-nga142-psu/

Dave closes out the basic DC circuit series with DC Power, Efficiency, & Maximum Power Transfer Theory tutorial. Includes Ohm’s law refresher. DC Fundamentals Forum: https://www.eevblog.com/forum/blog/eevblog-1401-dc-power-efficiency-maximum-power-transfer-theory/ Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHtVLq2MDPIz82BWMIZcuwhK