I wanted a small Bluetooth amplifier for my work shop and bought some cheap bare-board versions from Ebay. This TDA7498 design is over-advertised, but not as bad as other cheap bluetooth amplifiers from ebay. Test, frequency response and THD+n measurements show how good it compares to the promised performance of the TDA7498 datasheet. My own […]
Chinese 2x100W TDA7498 Amplifier – Test and THD+n Measurements Read More »
Teardown of a Eaton EX RT 5 kVA UPS model. The topology is a on-line double conversion with PFC (Power Factor Correction). The system is rated for a active power output of 5 kVA / 4 kW. I have also other teardown videos of 20 kVA UPS, 30 kVA UPS or even up to 60
Teardown of a 5 kVA / 4 kW Eaton EX5RT UPS System Read More »
I wanted a small Bluetooth amplifier for my work shop and bought some cheap TDA7492P bare-board versions from Ebay. Luckily there is other good Bluetooth amplifiers! This poor TDA7492P design is over-advertised and abused enough that I requested my money returned from the seller. Discussion of this review: https://highvoltageforum.net/index.php?topic=1057.0 Not a paid review, bought for
Chinese 2x50W Bluetooth Amplifier, Or Is It? A Poor Abused TDA7492P Design Read More »
I have turned my whole workshop around, been in every drawer, box, crate, container, shelf and cupboard. I sorted a lot of stuff, re-found a lot of things and threw nothing out! I start work again, it is no longer required to work 100% from home, but still to be planned to do so if
After Cleaning, What I Found… – End of Isolation, Day 42 Read More »
Sorting boxes, sorting containers and generally just a good way to reuse old packaging materials for storage solutions. The black suitcase like boxes comes from a special calibrated sensor and the small drawers are from fuses for mains electrical panels. How many mystery boxes do you have in your work shop?
Whats In The Boxes?! – Isolation, Day 40 Read More »
I scavenged a old 4 ton stone polisher machine for the best components and got off with a 3 kW AC server motor + drive, 4+0.55 kW variable frequency drives. In this video I teardown the Yaskawa SGMGH-30DCA6F-OY 2900W AC servo motor. Trying to make the 3 kW servo drive run: https://www.youtube.com/watch?v=Cg3Qx6J6NzU Teardown of the
3 kW Yaskawa Servo Motor Teardown – Isolation, Day 38 Read More »
I scavenged a old 4 ton stone polisher machine for the best components and got off with a 3 kW AC server motor + drive, 4+0.55 kW variable frequency drives. In this video I teardown the Fuji 7MBP50RA120 IGBT module that consists of 7x IGBT dies, diodes and internal protective circuits. Trying to make the
I scavenged a old 4 ton stone polisher machine for the best components and got off with a 3 kW AC server motor + drive, 4+0.55 kW variable frequency drives. In this video I teardown the Yaskawa 3 kW AC Servo Drive that let the smoke out in the previous video. Trying to make the
Omron/Yaskawa 3 kW AC Servo Drive Teardown – Isolation, Day 34 Read More »