![Hunting Hivolt PSU](https://www.experimental-engineering.co.uk/wp-content/uploads/2021/07/IMG_20210707_105010-300x225.jpg)
Another quick teardown post! This is a high voltage supply module from Hunting HiVolt – a company that hasn’t been around in some time. This is adjustable, and takes a standard 230v AC mains input to output a +1kV rail & a -250V rail.
![Label End](https://www.experimental-engineering.co.uk/wp-content/uploads/2021/07/IMG_20210707_105029-300x225.jpg)
There is a rating plate with some identifying marks, but I’ve not been able to find any information on these units anywhere.
![HV Outputs](https://www.experimental-engineering.co.uk/wp-content/uploads/2021/07/IMG_20210707_105018-300x225.jpg)
The other end of the unit has the mains input, and the HV outputs on binding posts, along with an Earth connection.
![Cover Removed](https://www.experimental-engineering.co.uk/wp-content/uploads/2021/07/IMG_20210707_104806-300x225.jpg)
A couple of screws allows the cover to come off, revealing the electronics inside. The mains is led straight to a transformer, that outputs 24V to run the DC-DC converter.
![High Voltage Transformer](https://www.experimental-engineering.co.uk/wp-content/uploads/2021/07/IMG_20210707_104818-300x225.jpg)
The main HV transformer is on the left, and the switching transistors on the right, attached to a heatsink.
![Transformer Windings](https://www.experimental-engineering.co.uk/wp-content/uploads/2021/07/IMG_20210707_104812-300x225.jpg)
These transformer windings are always pretty, no doubt done by machine & varnished for mechanical support & extra insulation.
![Control IC](https://www.experimental-engineering.co.uk/wp-content/uploads/2021/07/IMG_20210707_104826-300x225.jpg)
Control is done at the other side of the PCB, underneath the output PCB. Just a standard PWM controller.
![Voltage Multiplier Section](https://www.experimental-engineering.co.uk/wp-content/uploads/2021/07/IMG_20210707_104842-300x225.jpg)
The output voltage from the transformer is rectified & smoothed with capacitors, and there is also a voltage doubler hiding under here – this helps reduce the amount of insulation required on the transformer windings, since they only need to handle half the output voltage.