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Recent content by Jacounet

  1. J

    Induction heater 4 year project continued.

    Hello Gary. I'm retired too , but in France , in USA or otherwhere , it's true , we are slower and 30mn work take us all a day . I see you have try all the possibility of the De Royer oscillator . For higher power I think we can use an other princept ...a classical oscillator driving MOSFET...
  2. J

    Hiwatt Maxwatt G100R repairing distorting amplifier

    Hello Fail. As said highter in this subject , the fact you found + 50V in the emiter of Q14 and ( the + power supply) ,...and -10V in the emiter of Q15 ( the - power supply) , when the power amplificator fall in failure, is not normal . Here is certainly the problem . As said by Ylli , you...
  3. J

    Hiwatt Maxwatt G100R repairing distorting amplifier

    Hello. Here Jacounet from France . Where do you plug your 100mV 1 kHz signal ....? Make this trie : - make a short cut beetween pin 1 and 2 in the enter mark CON1 ==> that's became ground , and plug the ground of your generator at this pin/ground /1/2 , and plug the hot point of the...
  4. J

    Induction heater 4 year project continued.

    Hello Gary. The gate of each MOSFET is protected ,I think , by a zener diode ( 12 V ) on your scheme...so the power supply can climb at 48 V probably , "full mouth" of limit intensity of the MOSFET. I think we can put 2 MOSFET in paralel in each branch , but certainly it wil be necessary to...
  5. J

    Induction heater 4 year project continued.

    Hello Garry 350. In France we have make this "induction heater" some of us in the forum "usinages.com". This scheme is a scheme of the "De Royer" oscillator . It's a sort of an astable oscillator which provide power across an LC parallel circuit . So ,for that I have understand ,...it's a...
  6. J

    Capacitor discharge welder

    Hello. This is the results of my tries tomorrow. I have 32 MOSFET ( 20 IRFP4468 and 12 IXYS 100N10) in parallel. I begin my tries at 15 V because supposing a to hight ESR of my 0.18 Farad capacitor . My last tries support 20 Volts in MOSFET ...without dammage. I mesure the current at the arm in...
  7. J

    Capacitor discharge welder

    Hello. Tomorrow I made the 4th series of tries . I will charge the capacitor(0.18Farads) only Under 2 Volts ...because of a calculated current of 2V/0.0008 Ohms= 2500 Ampères.(2500/32 MOSFET= 78 A by MOSFET). Under 2 V with 0.18 F we have not enought energy ( 0.360 Joules) ...for make a...
  8. J

    Capacitor discharge welder

    Hello. For giving some live for this subject this is some phtography of my prototype . It was like this last month , Ihave made some change , the blue coil have only one turn now and is only 22 nH ...and I add one resistor of 2 milliOhms in each drain of MOSFET. The target is to trie to...
  9. J

    Capacitor discharge welder

    Hello Garry 350. The CH600HA-24H of Mitsubishi ( or CM600HA-24H) , can pass continuously a current of 600 A Under 1200 Volts . It's an interessing product for hight power but working with a receptor with an resistor/impedance upper than 2 Ohms...if used Under 1200 V. But it can't...
  10. J

    Capacitor discharge welder

    Hello Garry. Yes that's right , the Ignitron , the ancestor of SCR...(thyristor in french).:cool: Your spot welder from your factory work , can weld aluminium I suppose , because you speak of hole in the metal ...it's a caracteristic of too hot welding on aluminium. My solution for the moment ...
  11. J

    Capacitor discharge welder

    Hello.dr Pepper. I have make an order in China for 2 supercapacitors 500F/2.7 V , a possibility of 3645 Joules...and 50xMOSFET IRFR3711. In my first projet I will want to use N MOSFET in pararel , exactly 50xIRFR371 ( 93 A/20V ) in //. Before that , I have make 3 tries Under 80/90 V with 20...
  12. J

    Capacitor discharge welder

    Hello Shorbus. I have not made on PCB this scheme ...but it's OK with simulation ...is it the same in the true live , to verifie of course ... Yes this process in 2 part , a preheat/ prewarm make the resistor climb at 4 times the cold resistor just before the fusion ... that give a best...
  13. J

    Capacitor discharge welder

    Hello. My driver for MOSFET in // as here simulated With IRF4468... IRF3711 , have the same max current but only with 20 V , V DS .. Attention , this driver is particular for my prototyp , because of the max dI/dt by MOSFET (100A/µs) the 2 capacitors on the gate get down to the ground ...
  14. J

    Capacitor discharge welder

    Hello Shortbus. I'm happy , having a " learn something new every day" to you . I have seen nowhere a spotwelder for aluminium with discharge of capacitors and MOSFET power/driver ...(flat calm on the market ),... for this kind of material . But this sort of material would be very interessing...
  15. J

    Capacitor discharge welder

    Hello. If sombody interested by a DIY capacitor discharge welder , I can give you the schèmes ( all are very simple ): - the driver that command 32 MOSFET IRFP4468 ( I max 50 A possible ,t "on" et "off" setting at 2 µs because of the dI/dt Mosfet capability ) - the MOSFET in // ( easy on...
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