Unusual sauna sterilisation device

I think Bourns made most of the tight tolerance thick film resistors used in meters. The thick film resistors I was making at Mullard were strictly for the research department not for sale. By the time I left that job, Mullard had already re-branded the research division to Philips. They also dropped the 'Pye' brand around the same time.

Dave Davies

I wonder if Mullard made the thick-film resistors in the Avometers I used to service in a previous life (many lives ago)..

Gordo

The coupling is capacitive, but corona only happens at the edges of the smaller electrode where it can still capacitively couple, but through the air first. If both sides had overlapping electrodes they could create the discharge on both sides.

Big Clive

I've been trying to find a meter that actually measures ozone accurately. It's pretty tricky to do. Instead of splashing out money for research into the new short wavelength UVC they could just buy some of the 222nm excimer lamps from Ushio who have done the research and have been making them for a while. There are some interesting low level ozone units available for catering facilities. They contain a fan, ozone/UVC tube and lithium battery. The size of the space determines the power of the tube. The battery is purely for tube life monitoring by discharging it slowly while the lamp is lit.

Big Clive

I have been doing some research on O3 devices for work, in the UK the HSE safe exposure limit (15 mins per 8hr work day) is just 0.02ppm, in the US it's even lower at 0.01ppm. The UK govt has recently published a study which looked at multi faceted approached which included UVC, O3 production was almost exclusively discussed as a drawback to using these technologies in occupied spaces, mainly due to the possibility of breaching the SEL where no level monitoring is in place. Far UVC was promoted as a potential solution which has a direct to surface disinfecting action without being detrimental to human skin. They have now setup a new £300k fund to study this as an option, 3 UK universities are involved in the study.

The Tinkering Shed

Clive I was wondering if or why there is no corona discharge on the large side and only on the small side. I noticed you didn't show a discharge on your drawing either. I really don't understand why it's not discharging on both side since on every cycle the polarity reversing. Thanks in advance for any insight.

Cleveland Prescott

The problem with the bearings at the fairgrounds reminded me about a problem with a problem with gyros on satellites. They had a problem with the gyros slowly drawing more current till they would fail, the problem was solar winds inducing a current that was passing through the bearings pitting the steel bearings and races to solve it I think they went to ceramic bearings, it took them over a year to figure it out and originally they thought it was defective bearings.

Cleveland Prescott

Then once you get it apart “wow dog check out all those transistors, hey now don’t forget to bash that like and tap that subscribe, AAALLLRIGHG” :P

Michael Gilchrest

Ok, but then you have to talk like that in the vids too. Especially since it was April fools! “Bros and broessses let’s check out this flip fresh sauna sterilization! Ch ch check it out!

Michael Gilchrest

My eyes! What did they ever do to you! :D

Mark Dennehy

A finger that smells of burnt pork. :-) Brilliant.

Jon Knight

DELIGHTFUL video!

Michael Thompson

The trick with Thick Film is getting it to stick to the ceramic substrate after firing. The conductive inks are a mixture of metal alloy, binder and ceramic glaze powder. The idea is that you use inks of differing conductivity to screen print the components and interconnections and bake the whole substrate in a belt furnace. Back in 1975 thick film technology was an answer waiting for a question. The technology never really delivered on the original concept, but it did find a second life in screen printed/baked individual components like this corona discharge gadget. I think Philips briefly used a thick film 'daughter' board in some televisions, but it always felt like they were looking for an excuse to put thick film into production rather than using it to solve a problem.

Dave Davies

I wondered if it was a metal paste baked to sinter it.

Big Clive

It's a burst of trashy clickbait thumbnail-ness.

Big Clive

Yeah. The lurid text is clickbait central.

Big Clive

The ceramic disk capacitors are already marinating in acetone right now.

Big Clive

Very cool! I always learn something from your videos.

HarveyB

Derp, I see you mentioned it in the description big Clive, carry on!

Michael Gilchrest

The new font on the vids is kinda strange to me, no?

Michael Gilchrest

The conductor on the ceramic plate looks like it's screen printed 'thick film' technology. The 'ink' is screen printed then baked at high temperature whereby the metal particles suspended in the ink melt together and form a conducting film. Back in 1975 I was involved in the early days of 'Thick Film' at Mullard research.

Dave Davies

I was thinking the ceramic part had a lot in common with ceramic capacitors. Experimental shenanigans are required. :)

Wim

Moar moar CAPITALS THUMBNAIL TEXT WOWWNESSS!!!!! Haha. Yeww, "Saunas" always have that "specific" smell.

Anton

This is bad. Very bad. My warm memories of the public pool mean i was swimming in urine. Pool urine😂😂😂

Cerity

In swimming pools the desinfeting is done through hypochlorous acid (HCLO). It is produced by reacting Chlorine Gas with water. Cl2 + H20 -> HCl (destroyed through a reation with Carbonate) + HClO (highly oxidising) The Chlorine smell in pools is produced not by the active desinfectant, but chloramies that are formed in a reaction with ammonia compunds. So when a swimming pool has a strong "pool smell" there is not much desinfecting potiental left. Some pools, especially those with mineral water, use ozon to desinfect the water.

Back on form this week Clive! Good stuff! Thanks!

Nick Kendall

Saunas make me think of grotty porno

Simon Deards VK3FSPD

Sauna sterilisation device.... A kick to the groin in the Sauna?

horrovac