This detector has now been retired from service since it’s a fair bit out of date. So here’s the teardown! Unlike older detectors, this unit has a built in battery that never needs replacing during the life of the sensor, so once the unit reaches it’s expiry date it’s just
Continue readingFire Angel CO-9D Carbon Monoxide Detector Teardown
Here’s another active balancing circuit for large ultracapacitor banks, this one is designed for a series string of 6, at 2.5v per capacitor. Based on the design here, I have transcribed the circuit into Eagle & designed a PCB layout. As can be seen from the circuit diagram above, this
Here are the viewfinder electronics from a 1984 Hitachi VHS Movie VM-1200E Camcorder. These small CRT based displays accept composite video as input, plus 5-12v DC for power. Here is the front face of the CRT, diameter is 0.5″. Closeup view of the PCB, there are several adjustments & a