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@@SkippiiKai yes individual resistors to gates.i wouldn't do it any other way.would oscillate likely.ive had 4 different igbts in it.same thing.one pr.was safe parallel igbt,three were not.i also had .025ohm eq resistors on each igbt.also had igbts directly connected.doesnt really have any bearing.maybe I do a video of pulling one igbt off circuit,but actually there's irfp260 in it now.huge rings on output,but seems like it's better than igbts.still gets hotter than hades.i put the vat 4452? gate drivers into it last.the big sobs that drive 10,000pf.gotta go.

@@SkippiiKai yup currents never go beyond a 100ma or so.so changing the voltage reg was useless.yes 3 volt spikes on a huge wide ground both positive and neg.ive tried everthing.very frustrated.i put probably two weeks into it.lol.i even started running litz wire on gnds.no difference.maybe I'll put one last vid on to show u the point I gave up at.lolol.first thing I've ever built that I hate.🤯😄

@@SkippiiKai hey good to hear you.the lm217 handles more current than the 317.i had to abandon it.everything I put in there gets too hot to me,whether igbt or mosfet.turn off seems to be issue.doesnt make sense,people say drive the igbt gate negative,but no gate drivers will swing neg.they are all grounded outputs in off state.i just wasn't meant to touch igbts I hate those things.id have to run gate driver into a array of small fets to try to pick up a negative voltage.im not sure that's possible when it's output will only go as low as ground.i have not found one gate driver that will swing negative,so that tells me that everyone saying pull gate negative doesn't know what their talking about??lol.thanks🙂

@@tauceti. lol.i think I know why you say that😄

Ps.i bought a omnilab.its the,"cats meow"😀it's a fine piece of hot plate,approx.225$ american.no shock or cut hazards,no over shoot,no guess how hot it is!🙂

@@ReeceGilbert-tu5up oh my,I have a fan in this one.i don't have any videos covering that kind of troubleshooting.best wishes.message if you need help.😃

@@calvinrichardson3562 awe thanku for the nice comment.😃long live sansui🙂.

Sorry.i was thinking these were originally green.after watching video,I realize I changed them due to vision problems with the color red.🙂

@@gino3286 hi gino thanks for comment yes high end amps are generally a blank faceplate with a power button.i really like integrated amps so there's lots of buttons.😃😄it is very well made as really all amps were in this time period.1977 to 1982 always seemed to be the best of years.best regards🙂

Also some amps do have the "pre".in and "post" amp rca's on back to do that.🙂

@@generalingwer4341 Hi ! thank you very much for your kind and valuable advice These very fine amps appear on the 2nd hand market and sometimes they are in great shape Integrated were very popular back then more than the pre plus power amp solution I will look after one i would like to set up a little lab one day if i can find a place that i am looking for Thanks again and kind regards gino

@@generalingwer4341 yes i see and i like that a lot Usually if there is a problem is located in one of the two section what scares me is that usually the tone control section is full of parts that can go bad with age To track the broken ones is for experts It is fundamental to find the service manual or at least a schematic to spot the power amp section inputs Then i could route the signals even to a headphone jack on the back and using a jack to rcas adapter to connect a preamp I usually read the power consumption written on the back to get an idea of the power available from the amp Thank you very much again Best wishes gino

It's a 8"piece of #10 ground wire.

The secret is ptfe oil😁

It think that would be bad,I put high temp fiberglass tubing over element connections..it doesn't take well.

@@ChristopherPlatt yes, I've seen those a-700.ive never seen inside or worked on one before.thanku for watching🙂

@@mykedoes4099 I can take the duty cycle to less than a microsecond on my function generator,but the frequency must be approx.or greater than 1mhz.

That maybe the case if it's original.😁

@@Hawkesdog 😁well thanks for looking inside mine😅

@@vukvukovic3737 thanku very much😃

That sounds like a amazing trip.i aways admired Japan and its people. the craftsmanship I've seen on various things I found inspiring.

I would like to go that direction too live amongst a pack of ❤wolves😃.it's too cold for the artic wolves I suppose.i reckon monty would approve😁.

@@Ejlectronics6 yeah finding one is as tough as replacing it.give me a bit here to search through some boxes.i may be lucky to have the mouser bag saved in my g55 box.

@@generalingwer4341 I'd appreciate that! My only other option is to maybe dissemble it and try to fix the fault... bit risky though!

@@Ejlectronics6 no go.have pots but no mouser bag.i did treble plus It looks balance.i remember the treble ended up being taper issue on new pot,but I left it in...lol..log vs linear or vice versa.its generally best to try to use existing,even if micro surgery.there is a slot on the two pins banding pot together.look from shaft end.the slots are super tiny.i get about two tries until there stripped.the back of that pin appears to turn as well.cant see it,but I wonder if you could find away to make the back stop,maybe it's a super tiny inside threaded shaft??takes a heck of a good jewelers screw driver.u could also grind the pin edge off.they should come apart then,just find a cleaver repinning.best I can stay their a pain in @#$%.😄but I do love sansui!

@@Ejlectronics6 yeah it is risky.case in point I almost had to toss my a40 volume control away yesterday,due to stress from getting it back together and bending a super tiny contact inside.lol.i pulled through,but it was close.😄🙈another thing to try that's on my list is a cheap ultrasonic,dump some jewelry cleaner in,and let it vibrate for awhile! It's less stress than micro surgery and might just work🤔

@@lindsaybrown7357 that's great!I had one in a wood box too,when I was in grade school.i remember making a fish caller.id put the speaker in a bag and sling it out my bdrm window.there was no water for miles.😄guess I was expecting them to walk to my window😅🤣

@generalingwer4341 Ha Ha, maybe Mexican Walking Fish ?

@@lindsaybrown7357 lol,what would have took the county by storm.😁

You know looking back books always worked for me.when those all went away for various reasons like many other things,I've come to find Google and 2024 does not work.case in point I went searching for some radio shack books the other day,notebooks really,use to sell for probably 2.99.the mini engineers note books from Forrest mimms the third.he had many publications out that were super useful.the prices were unbelievable when I found them.i guess today a good education is priceless,because wow not 2.99 anymore.i wonder if Forrest mimms ever tried to rewind a microwave transformer?my guess is not,because he had other transformers to work with.😏🙂

@generalingwer4341 I'm finding my collection of reference and text books are becoming more important to me. Kind of a constant in a comforting way. Agree about the Radio Shack note books, little treasures. I have a full set of Hawkins Electrical Guide printed in NY in 1924, little black books with gold edged pages. I keep finding myself noseying through them and marvelling at the old time images and diagrams.

@@lindsaybrown7357 yes, you gotta have comfort items and constants in life.some good books,no internet,owning anything and bacon are the best.mine is my shoebox of wire and monty's🥰 greatest hits on youtube.well actually my rin🫡 tin tin movies too!I'm gonna search those Hawkins on ebay.my motto is if you can't live in the future,indulge in the past.😁

,"your reputation for reckless disregard of electricity"?🤣I'm not sure why ozone for that.these are fish tank machines.could be science to it or simply marketing gimic.i do know though ozone solubility in water is quite poor,unless it's in ice bath,even then it's not real high I believe.i once read something that implied ozone is better produced at lower high voltages.this machine is 500mg/hr.it very much surprised me just how quick the stink will come,it's daunting to me.generally machines you can buy generate thousands to tens of thousands of mg/hr.this is smallest one I could find that stated output.its a real lung blaster,but it seems short lived in water.people use these for fruit I've heard.small amounts probably beneficial large amounts send u for a gas mask.

@@doug694 I didn't care if it was the right one,I just knew it would be a "good" one in 2024.😄

@@generalingwer4341 yeah we can't be so picky about finding a perfect fit when half of them are 555s or OPTOs in disguise

@@doug694 🧐😲😆

Yes it is.doing it this way eliminates buying a 74 cent chip,and it's much more fun and educational.😉😃

Thanku. maybe I'll put a minus rail on it at some time,just to see if my theories right.😀.thanks for watching.

Got u thinking?a integrator converts square wave to triangle.very similiar to my first step video.one way to get triangle to sine is sending it into a differential pair of transistors to opamp.thanku for watching😀.

@@PintaoLoko 😃that is awesome.this is my favorite one.its used very hard and gets cleaner in keys,but it keeps ticking.i love casio.thanks for sharing.🙂

@@lindsaybrown7357 lololol.i haven't smelled it yet,but that brings something to mind about chemistry.on rare occasion I've found a "amine" like odor on circuit boards and similiar things.amines are generally associated with a "fishy odor"but sometimes smells like bleached(clorox) skunk.monty wouldn't approve.😆thanku🙂.

@generalingwer4341 Some of the smt Caps don't smell too good when you cut them open.

Ok,i see, there must be chemistry there,im gonna investigate.thanku very much for watching my"stuff"@@lindsaybrown7357

@generalingwer4341 There are some odors you'd be familiar with from your time in the electrical game. One distinct one that I instantly recognise is the smell of PCB based oils used in old transformers and capacitors.

Congratulations fine sir,you have won the psychic award!🤔🫢👏👏💯💥😇I just can't fool you.the triangle is the starter for pwm.this should do want you want.send it into a comparator.it will be as stable as your reference/regulator voltages allow.the biggest clue for me would have been seeing sym.written on one pot,but your psychic ability is whole other dimension🥳🥳🥳

I will check it out after I finish up here.thanks👍

Yes ,I know why u said that.the gate drivers were "wrong".i plan on a follow up,it should be good now.🙏1000 turn transformer is bad luck.

@@generalingwer4341 👍🏻👍🏻👍🏻

@@T2D.SteveArcs thanku that's what on here 8t.🙂some I have 10.

@@T2D.SteveArcs thanku very much for the info😃

@@generalingwer4341 no problem 👍🏻👍🏻

Thanku very much.🙂im no rocket scientist but I do love playing with stuff.the microwave transformer was my worst idea.everytime I added turns to it,it just got worse.

@generalingwer4341 no its great mate, seems less and less people are even interested on how things work anymore 🙁

😃funny u say that,I believe those gremlins were a result of a external source too,or a scope😁that needs tlc.

@generalingwer4341 yeah i often see HF noise on the scope from local SMPs etc, i doubt its from the scope but you could set the op to gnd and look at the noise floor to check this

I'm working on the di/dt.i know the concept,but stumbling on applying it(snubbers).

@generalingwer4341 try a 10nF 10ohm RC across FETs mate, or a RCD snbber you can also try increasing the gate resistor value and use asymmetric gate drive, switch the gates on through say 15ohms and off through 8ohms to even it out, id need to see your schematic to try help in a meaningful way.. to be honest you would be better using a SMPS IC like the TL494 or SG3525 where you have full control over frequency and deadtime aswell as 2 error amps for voltage and current feedback if you want to implement and regulation or protection etc, you can use it without any feedback of course.. i used a 494 and isolated gate drive ICs + cm300dy24n in my 18kW half bridge, no GDT so i can drive anything from 1.5kHz to 50kHz..

@@T2D.SteveArcs we need to be neighbors,shortest response.🙂

@@generalingwer4341 😄❤️😎👍🏻

Huh.i never tried no gap.lol,but I've tried every gap up to about .036" at least a thousand times😅😅😅

@generalingwer4341 he he, i would try a different flyback mate, 2500t secondary sounds a lot, the inductance of that will be massive aswel as the interwinding capacitance etc, usually fb are around 1000 to 1500t for 20 to 25kHz

Thanks for the tip!

@generalingwer4341 no problem mate

@@generalingwer4341 did you try it?

@@T2D.SteveArcs not yet but I will next time.🙂

@generalingwer4341 😎👍🏻👍🏻

I'm having a hard time with that concept.my thought was that osc.was non-resonant.the time constant was being determined by the rc, 470ohm resistors along with the approx. .56uf caps combined with gate characteristics....strangely these caps are marked 50khz.""makes no sense why you would label a cap with a freq?""unless that was freq. at which it resonates with known or given primary.that implies it's lc resonant.im pretty confused over that.also to condemn my theory of rc,the rc would be pretty much a constant freq,load no load.this was something like 8k to 13khz change from memory.im gonna have to draw off a schematic of that board.😃thanku.

@generalingwer4341 theres a lot to answer here mate, do you have fb? The caps are marked with a max frequency because they are RF capacitors designed for use in induction hobs, the thing that sets the resonant frequency in the ZVS is the inductance of the transformer and capacitance of the tank caps iirc the caps are 330nf and there's two in parallel so it would be f = 1/ (2pi x sq/rt (L x C) and the inductance decrease as you load the output so as the inductance drops it will oscillate faster

@@richardl6751 yes I know what dead bug is.😃spider circuits are close relatives to "dead bug" construction, but their not suspended over a clad board.also its hard to tell when ur spiders dead because his legs point every direction😄thanku for comment😃.

​@@SkippiiKai 🤣🤣🤣unny fact i was gonna describe this circuit as being bipolar,but I didn't know what that conversation would lead me too.shes hot&cold,she's left&right,she's up&down,etc..i had a neighbor girl that was on the rollercoaster.😅on another 😂note,I hear people are getting AI girlfriends,think of the implications of that!!if I had one and built this circuit she might "come undone"like in the Duran Duran song.😂😂😂😂

Wow🤔.not sure what to say? Thanku.im a very small fish in a very big pond.(actually less than a fish)at any rate spider circuits are about achieving a state of mind😁they don't even have to work to be spiders😅.looking forward to monty videos.youtube is crooked,they hate me,won't surprise me if they find a way to hid monty's videos from me.ps.id like to ship monty a box of pots😆

@@daveelliott9235 lol.i say that everyday scrolling on here.😅it doesn't really have a specific purpose.just a intimidation factor for the neighbors.it will generate ozone which could cure you or kill you.🙂