Teardown: 50w led floodlight
An eBay bought 50W LED floodlight with PIR detector. It cost about £14. It's large, probably to help with heat…
Julian’s postbag: #61 – green watch, 12v powerbank, doorbell
More cheap electronics stuff from China :) Support Julian's Postbag videos via Patreon: https://www.patreon.com/julian256?ty=h OLED Bluetooth Health Wristband Sport Fitness…
Idea: lithium cell balancing using ac power transfer
Using small transformer-coupled battery chargers, each cell in a lithium battery pack can transfer energy to all the other cells…
Dodgy kit build: electronic burglar alarm with bad science
This dubious electronics burglar alarm kit, which cost 50p at my local charity shop, kept me amused for a full…
Julian’s postbag: #60 – electronics modules from china
More cheap electronics stuff from China :) Support Julian's Postbag videos via Patreon: https://www.patreon.com/julian256?ty=h Digital DC Converter CC CV Power…
How tall is my knex tower?
Today I built a Knex tower which I thought was about 8 feet tall - but it isn't :(
Julian’s postbag: #59 – wonderful tech or worthless tat?
More cheap stuff from China :) Support Julian's Postbag videos via Patreon: https://www.patreon.com/julian256?ty=h DC-DC Converter Isolated Power In 10V-16V Double…
What are milliamp hours?
There's a lot of confusion about milliamp hours. What electrical quantity do milliamp hours represent?
Electric bike upgrade: plan to use electrodacus sbms
This summer I'm planning to experiment with using the ElectroDacus SBMS to charge my electric bike.