Hopefully? Another 48vdc-240vac Toriod Inverter build.

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KeepIS Guru Joined: 13/10/2014 Location: Australia Posts: 1770	Posted: 10:45pm 05 Jun 2023         tinyt said   Nice! Can I have permission to copy your circuit? That's a very old circuit from way back in my Audio days, I think you will find it everywhere as there really is no other way to design it with 2 op amps, or 1 dual op amp. Most meter movements should go full scale before the two diodes across the meter start to conduct. Just some very basic protection to try and stop the coil burning out if a "brain snap" moment happens.   Obviously you don't have to use an isolated supply to power it, but as I mentioned before, I'm trying to maintain earth and supply isolation to keep interference, earth loops and spikes to a minimum in this inverter.     Link:   D-C2T- 500A unit is the one I use in this Inverter for peak DC input. Select the option for 12V or 24V supply rail. Current consumption is <25mA. Current Sensor   Quote   Do you think it's possible to calibrate the meter without having the DSO capture facility? You really need DSO to capture the instantaneous peaks, but you could try using a CRO and your camera to video the startup up, you should be able to catch the Peak Sensor output voltage if you set the CRO correctly. But a DSO positive edge triggered and 100ms time base is hard to beat. .