It’s one of those horrifically dangerous 2.5×2.5×2.5 cm mini-cube singe port 1 A USB chargers. There were scorch marks on the base of the case. The circuit was very simple, a simplified SMPS on two small PCBs… which held into the cube casing with white silicone/glue – scratch that away and it is easy to extract the pair of PCBs
Continue reading Burnt out USB charger
Whilst looking into the XTAR battery chargers, I came across the XTAR EU4, which offers QC3.0, 2 x USB 2.4A and USB C (PD) ports… although the QC and PD capability is a bit limited (i.e. QC has no 20V capability, and PD current is limited to 20V 2.25A (45W)), but not by much…
Continue reading High power USB charging station
A 4-in-1 bench equipment… a very very heavy jack of all trades and master of none?
Continue reading Metex MS-9150
Sort of following on from VCO madness, I was really looking for the Super Simple VCO (which seems to be actually a 555 timer as a VCO, see the GetLoFi LFO in Ha Ha Ha… 555 fun). However, I got distracted and ended up analysing PSUs and buses for synths.
For ease, in order to power my synth, I had been planning on using a couple of single rail 12V SMPS designed for LED lights, in order to make a dual rail supply, but I started to wonder about the noise implications – as all designs for synths appear to use the old fashioned transformer, rectifier, and linear regulator approach.
(As an aside, Julien Ilett also points this potential noise (as related to buck convertors and SMPS) issue out in Julian builds: a Split Voltage Power Supply (+/-12v and 5v) @5:20. See also, Julian’s Postbag: #85 – E.Ink, Spring Onion, Split PSU (@7:33-8:00), where he mentions that high frequency noise is not removed by the linear regulators in the Split Rail Power Supply Kit Build – SEPIC Cuk Topology).
Continue reading Synth Power Supplies
I already have two of these, the simplest version and the white one with a lead, but neither are close to hand, so I need to get another one, but a different one…
Continue reading USB Meters
I’m looking for a mains socket meter
Continue reading Mains socket meters
DIY time… precision power supply following Dave’s design…
Continue reading DIY Power supply