Uploaded July 2026 | Updated September 2026, 2 weeks ago
I was expecting this unit to be super-simple inside with a capacitive dropper, a zener to cap the voltage and a potentiometer in series with a string of LEDs. But it turns out to be much more complicated.
I guess the justification is that it is universal voltage and the UV LEDs are run at higher current than the blue ones.
I subsequently noticed that the potentiometer is only used for part of its arc, and as such the full PWM range is scaled into that arc.
This was a random eBay purchase.
If you enjoy my videos, supporting the channel on Patreon helps keep it independent of YouTube's quirks, avoids intrusive mid-video adverts, gives early access, bonus footage and regular quiet Patreon live streams.
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paypal.com/paypalme/bigclive
#ElectronicsCreators
I was expecting this unit to be super-simple inside with a capacitive dropper, a zener to cap the voltage and a potentiometer in series with a string of LEDs. But it turns out to be much more complicated.
I guess the justification is that it is universal voltage and the UV LEDs are run at higher current than the blue ones.
I subsequently noticed that the potentiometer is only used for part of its arc, and as such the full PWM range is scaled into that arc.
This was a random eBay purchase.
If you enjoy my videos, supporting the channel on Patreon helps keep it independent of YouTube's quirks, avoids intrusive mid-video adverts, gives early access, bonus footage and regular quiet Patreon live streams.
patreon.com/bigclive
Alternatively, for a single coffee contribution you can use PayPal:-
paypal.com/paypalme/bigclive
#ElectronicsCreators
