If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Hi all. Project "Nukerwave"
Essentially this is a smart microwave which is capable of adjusting its power from 0.5 to 110% or any pattern combination needed in a very precise pattern broadly similar to how a PCR machine works.
This is done by replacing the clunky mains transformer with lots of little inverters running on mains or independent battery back up and controlled by two Pi Zero W's running in master/slave quorum mode. The software is running on both Pi's but has an LM1881 on each S-video output which is also hooked up to a viewscreen in odd/even mode. This allows me to view both units simultaneously with modified 3D shutter glasses and the LM1881 is hooked up to a 555 based reset circuit allowing one or both units to be restarted then resynced with the other in case of failure. Also included: magnetron crowbar for safe shutdown by dumping capacitor energy through two shunted Russian power triodes. This is in addition to other failsafes mentioned later.
The software so far is just basic Jessie but using W means I can also monitor things like magnetron leakage/reflection using the built in signal strength meter and NoIR camera feedback on the pellet/etc in addition to O2 flow rate and other parameters. The 3D image is displayed and can be seen remotely, also by using model servo and TV colour wheel different wavelengths can be selected allowing for various experiments to be done.
4*36V Fans also controllable from software so I can run this for up to 12 hours at a time without risking overheating.
Safety (important!) I am going to be using the existing door sensors as a direct go/no go to cut power on the HV drives. The battery backup and mains are wired through two independent relays so that both have to go on in sequence for magnetron to be enabled and the door switches also have to be locked. There is also an additional failsafe if MW leakage over 1.5mW/cm2 detected (well beyond wifi output) that cuts main and backup power via external inline ELCB trip and sounds audible alarm.
Backup is likely to be 4 12V 3Ah alarm batteries as they fit in existing space within the sealed external RF shield. Filament current is also monitored and can be adjusted for soft start thus increasing magnetron durability.
As also mentioned this setup can be installed on nearly any microwave but the older ones seem more robust and plus manufacturers leave a schematic on the inside casing (!) making repairs simpler.
Current status: have one W + noIR need two. I have an original Zero here and might be able to add needed parts but lack of a camera is a real pain. May have a candidate MW oven which is a Sharp and has a decent power output (850W) but need to retrieve it from Shed of Doom.
Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
No, but this looks interesting:
I don't agree that the circuit from the application note looks similar, but other than that, he looks pretty accurate. You might be able to modify an original inverter board for your purpose. It seems that all the ingredients are there, all that is required is a more accurate power control (which could be done externally by a feedback system so long there is enough range on the control input.)
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
"Smart" microwave
