A lot of texbooks don’t teach Composite Amplifiers, but they are one of the most used circuit configurations to solve real world design poblems where you have multiple conflicting specifications. Opamp Tutorial Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHu2FviAaZaiyXwN41G4b1Lf Cascaded Compound Amplifiers: https://www.youtube.com/watch?v=ZvT9hHG17tQ Forum: https://www.eevblog.com/forum/blog/eevblog-1609-composite-amplifier-tutorial-practical-demo/ 00:00 – Composite vs Compound Amplifiers 02:53 – How a Composite Amplifier works 05:09 – Why not just cascade them? 07:23 – This do ..read more

More mailbag! 00:00 – Jumperless Breadboard from Architeuthis Flux & WokWi https://www.tindie.com/products/architeuthisflux/jumperless/ https://hackaday.io/project/191238-jumperless/log/222858-getting-started-using-your-jumperless https://wokwi.com/ https://www.digikey.com/en/maker/projects/jumperless/2e62cc88ee6145bc924041dd486de76f https://theamphour.com/599-an-interview-with-uri-shaked-wokwi-com/ 08:42 – Trying the software, it didn’t go so well… 21:20 – Automated probe connection function 22:35 – My old IC Tester project 23:32 – 16TB Hard Drive 25:26 – Modius Headband: Induce sickness ..read more

Physically vibrating your power supply at a sub harmonic of your PSU switching frequency can potentially lower your system noise. A practical demonstration. AlienTek DP100: https://s.click.aliexpress.com/e/_DeWCLIN Forum: https://www.eevblog.com/forum/blog/eevblog-1607-psu-switching-noise-reduction-via-vibration/ Linked videos: Tesla AI PSU problem: https://www.youtube.com/watch?v=YIbQ3nudCA0 Vibration coherence: https://www.youtube.com/watch?v=uus_cpZiqsU Vibration testing: https://www.youtube.com/watch?v=1Y2L6QLOi-c AlienTek DP100 PSU: https://www.youtube.com/watch?v=Pd6LG7iP2GQ Ceramic Cap ..read more

AlienTek DP100 100W USB-C PSU REVIEW https://s.click.aliexpress.com/e/_DeWCLIN PSU Noise measurement: https://www.youtube.com/watch?v=G8Qoj3TpO9A Forum: https://www.eevblog.com/forum/blog/eevblog-1606-$45-alientek-dp100-100w-usb-c-psu-review/ 00:00 – AlienTek DP100 100W USB-C PSU Unboxing 02:43 – Power on and operation 08:57 – User Manual 10:01 – Trying USB-C source 10:44 – Setting Menu 12:00 – uSupply Inception 12:55 – Physical size comparison 13:16 – Teardown 14:44 – PCB Inspection and design analysis 18:14 – BOM Consolidation & MOSFET’s 19:15 – USB Power Delivery Chip 20:46 – MP9928 Bu ..read more

Dave is chasing fart noises in this JBL Charge 3 waterproof speaker. A teardown, and powerup on the bench to find the mysterious fart noises. Will it get repaired, or will the fault do a Harold Holt? Part 2: https://www.youtube.com/watch?v=u7sVGnrf0P0 Forum: https://www.eevblog.com/forum/blog/eevblog-1605-chasing-fart-noises-jbl-charge-3-repair/ 00:00 – JBL Charge 3 Waterproof Speaker Fault 02:17 – Teardown 07:13 – Drivers 08:16 – Passive Radiators 09:58 – The Case Moulding 10:46 – Main PCB 11:36 – Under the microscope 15:30 – What’s this Power Rail doing? 18:07 – Power Rail Capture 20:16 – A ..read more

Burden Voltage is a BIG trap with Multimeters, don’t get caught out! A short video demonstrating the impact of Burden Voltage / Shunt Resistance on current measurement. Mutlimeter Shunt Tutorial Part1: https://www.youtube.com/watch?v=jx0dryLmUEQ Part 2: https://www.youtube.com/watch?v=xSEYPP5Xsi0 Forum: https://www.eevblog.com/forum/blog/eevblog-1604-beware-multimeter-burden-voltage ..read more

Repair of a Sony HCD-SBT20B Bluetooth Stereo. What it’s like to nail the repair and then, well come-a-gutsa and have to go down the rabbit hole to fix the fix all whilst battling bad design info. How VFD displays work: https://www.youtube.com/watch?v=gZIRPJt69sM Mud run video: https://www.youtube.com/watch?v=yAahT8_P-_E Tektronix autopsy: https://www.youtube.com/watch?v=VZCokbsTwmQ Forum: https://www.eevblog.com/forum/blog/eevblog-1603-sony-amplifier-repair/ 00:00 – Sony HCD-SBT20B Bluetooth Stereo with a water ingress problem 01:17 – Water isn’t that bad actually, even mud. 02:49 – Comically ..read more

How VFD (Vacuum Fluorescent) Displays Work. Extracted from a hacking video #717: https://www.youtube.com/watch?v=clUVEyi_YNM Forum: https://www.eevblog.com/forum/blog/eevblog-1601-how-vfd-(vacuum-fluorescent)-displays-work ..read more

ouute: Road Based Energy! Harvest kinestic energy from cars using speed bumps. Will this decarbonise and save the planet? Do the numbers add up? https://www.rouute.com/road-based-energy Discount Morgan Freeman promo video: https://www.youtube.com/watch?v=uGw2lcTS1gs Introducing Rouute test video: https://www.youtube.com/watch?v=BxnksdL5nx8 https://www.electricaltimes.co.uk/worlds-first-road-based-energy-recovery-system-set-to-launch-to-market-to-help-drive-net-zero-agenda/ https://www.business-live.co.uk/manufacturing/grimsby-start-up-could-generate-26824298 https://www.facebook.com/rouutetec ..read more

The TOP 5 Jellybean Bipolar Junction Transistors (BJT) 00:00 – What is a Jellybean Component? 01:30 – Low Power BJT: 2N3904 / 3906, SMD Marking 1A 06:49 – 2N2222 08:52 – BC547 fanboys 09:28 – Medium Power BJT: FMMT617-619 / 717-719 12:27 – SS8050 / 8550 15:08 – High Power BJT: 2N3055 / 2955 17:09 – Sneaky MOSFET, and the differences from BJT’s 19:30 – High Voltage BJT: FZT458 / 558, FMMT458/558 Jellybean Series Playlist: https://www.youtube.com/playlist?list=PLvOlSehNtuHv268f0mW5m1t_hq_RVGRSA Forum: https://www.eevblog.com/forum/blog/eevblog-1599-top-5-jellybean-bipolar-transistors ..read more