@@kwkrefrigeracion9549 you can use 12v also for the transistor, but you get bigger arcs with higher voltage (more power)

@@acquireelectricity1458thank’s for the data!!

Opamp uses 12v in my circuit, only the load has 45v, in other words i use 2 power supplies with common ground opamp gets 12v and load gets 45v

@@acquireelectricity1458 Thank you for such a fast reply.. so what I did is that I powered the whole circuit with 12 volts, and it worked like a charm! I also drilled a hole on a pc heatsink and screwed the irf460 on it so I can have a fan-cooled heatsink... I want to ask you something though. I measured the audio input to make sure that there is no current to kill my audio source and somehow I measured 20volts DC that could easily kill anything plugged to it. (Connections all checked) Do you have any idea on how to fix that?

@@yiannisyiannis add a capacitor in series of audio input, it should remove dc and leave audio signal mostly unaffected, you can use 1-10nf or similar

Alright.. I will do it and then let you know if it work!

Alright so I added the capacitor and ofc it blocked DC! That worked.. I dont rlly want to bother you with all my circuit issues but... I rlly want this to work in musical mode...when I open the switch for some reason the circuit stops working... the power LED turns off and no audio... I dont know what is causing this.. do you have any advices on what could have cause this? Or at least some ideas on where to look at for issues... (you got my sub by the way :)

Try adding zener diode (15v) across gate and ground, 555 timer can produce voltage spikes and mosfet gate only takes up to 20v.

Thanks!

Ok, I will check it out)))

Bc337-40

You can use any small npn transistor as long as It has bigger breakdown voltage and current used in the circuit, any npn 1amp or even 0.5amp and 50v will do nicely

@@acquireelectricity1458 Ok .Thanks for answer .

Sure, my email is zgs.tamutis @gmail.com

I don't know. It switches power to primary at audio input frequency

@@acquireelectricity1458 what ever it is , its brilliant . thanks for a good vid :)

@@garygranato9164 thanks for the kind words!

I believe you can find it in the replies of my comment "if you have any questions feel free to comment"

@@acquireelectricity1458 thank you real much!

@@otaviofischer4414 no problem!

After dark I think

@@acquireelectricity1458 thanks, who is it by

@@cosmicyoke mr. Kitty

Yep, for now its quite unstable, the chip needs around 2vpp for complete modulation, but the phone outputs around 1v so amplifying the audio signal should make it more clearer

In my testings i found that the duty changes between 3-5v on the feedback pin so signal from phone must be amplified and dc biased 4v or so

@@acquireelectricity1458 (sory for the language) si miras el pdf veras los valores que admite el pin de feedback, lo que yo hice fue poner un potenciometer en Vref y el pin central enviarlo a feedback y al mismo tiempo conectar la salida de un operacional para inyectar musica, funciona but dont have the HV set ensambled only i can see with the osciloscope

Yah, i just found music on youtube, others create their own using fl studio, dont have time for that

@@acquireelectricity1458 what type of flyback you use?

@pro.empire I just bought a bunch of them for 2€ each in my local electronic parts store. They are from CRT TVs. If there are none in your local electronics shop, you can find someone donating their old TV and take the transformer out of it. Of course you can buy them at ebay and other online shops.

@@acquireelectricity1458 Thank you brother I'll go buy a TV. I'm not sure where going to be inside but I'll open it.

@@pro.empire look for a video on how to determine pinout pf tv flyback transformer, you'll see what it looks like and how to inspect it

Video coming soon, right after i finish my exams!

@@acquireelectricity1458 yey! Good luck

Mosfet gets hot after a while, id say the longest i had it run is 2 songs so about 6min. There is still a lot to improve in terms of efficiency, but as always you can use more mosfets in parallel and a bigger heatsink :Dd

Acquire Electricity - on know on a H-bridge set up you drive the fets with a ferrite core for galvanic isolation and also preferred working frequency range …. Is it just current draw or parasitic oscillations ? Causing the heating - if the fet is ringing on it gate, that can cause heating because of overshoot - the fet is nearly always on or has it got a good duty cycle??

@@Jonodrew1286 i checked with osciloscope, the mosfet gate voltage looks clean and nice, there is tiny bit of ringing, but i doubt that is the issue

@@Jonodrew1286 In this videos particular setup the duty cycle changes between 0 and 50%

Acquire Electricity maybe try sweeping the frequency range - seeing if any really effect the switching of the fets - I built one from a circuit not mine but I did some mods - it uses an SG3525 chip not too dissimilar from the tl494 when the music is simple and everything is cold all is well after running for a while the chip is warm not hot but enough…. The fets are cold barley get warm - I even put a glue on heatsink and used a flyback from an old typing word processing station….. the output starts clean and crisp then it distorts - tried different ferrite - its the frequency range that seems to upset things in my case 🤔

that looks like a dc flyback🤔

No, its 12v dc, you can use up to 20v, i'd recommend 18v

@@acquireelectricity1458 if i make it does it really sound this loud? And another question did you use 3.5 jack for your audio input? And what does that NO contact exactly do on the emitter of the bc337?

@@erfansoltanlou4836 the npn transistor is for the reset pin of the 555, you can put opamp output directly into 555, but i found using npn transistor helps with noise issues. At 45v primary input and about 15a it sounds very loud as you can hear in the recording.

@@erfansoltanlou4836 it doesnt matter which jack you use the audio input in my experiments comes from my phone, in newer circuit I use RCA jacks

@@acquireelectricity1458 what kind of power supply should i use for both 18v and 45 v current wise 🤔

For transformer itself check my latest video, and for the schematics i have filmed half of that video, so it will be there soon

@@acquireelectricity1458 waiting you and all my family will subscribe your good channel

@@mohamedrasheed201 probably will post schematic video tomorrow

Been busy with exams, once i get the time i'll make the vid

@@acquireelectricity1458 hope sucess for you

Yes, i will definately try it in the future

Thanks!

I am going to post a video with schematic once i finish the whole circuit

Thanks!

I use active ice water cooling

@@twhvyt yeah it is not quite there yet, I'm working on a new design. I used big heatsink

@@acquireelectricity1458 fans?

@@twhvyt yeah small 12v fan. I'm working on a circuit with smaller losses so will be no need of big heatsink

@@acquireelectricity1458 physically not possible to me, are you gonna switch a relay? Mosfets are used to switch the transformer

Improved version coming soon!