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I didn't change that resistor. The resistor in the Hackeman picture are the same, 100 ohm. It use a different notation. Only the tolerance vary but is not important. In Hackerman's picture the resistor is 100ohm with 5% tolerance (4 color bands - Brown Black Brown Gold). In my picture is 100ohm...

I had two 220V labeled SJK induction heaters that I studied and repaired. I posted on the forum even the schema. In fact, they are made for 110V. Those that are labeled with 220V are actually those 110V to which some components have been changed. At 220V they have a limited operating time after...

There is no Need for inverters It will work perfectly Just connected to mains

Wright, only metal is detected. Ok maybe It will work but the metal can Be very hot so quickly when You use sjk. Be aware.

I chose to use attiny84 because it has power on pins 1 and 14 and can program very easily with arduino ide. That's what ATTINY84 looks like with the pins bent on the other side. Mounting in the socket is done with the key on the opposite side. In fact, the original microcontroller is mounted...

It would be nice to find out but I have not found any information about it. The microcontroller is a Chinese one, unidentified but I will replace it with an Attiny84 because I do not have to make any changes on the wiring. I just have to turn the pins on the opposite side to fit in the socket. I...

I bought the transistors (SPP11N80C3) from a local store but can also be found on ebay or on other sites. I also replaced the C2-22nF capacitor. Unfortunately I did not find it at 2000V so I put one at 1600V. It was necessary to replace the diodes D1-D4 with a rectifier bridge because two of the...

The sjk heater has been designed for metal objects. The proximity sensor is based on changing the inductance of a coil when inserting a metal object inside. Because the heater uses the induction for heating, only metal objects can be heated.

I have two sjk heaters that I fix. one I repaired and it works perfectly and the other is for the study. I noticed there is a 3.1s heating cycle and a 0.25s break. In that pause, the proximity sensor checks the existence of a metal object inside and, depending on the result, stops the cyclical...

I made some correction in the schematic. The leds was wrong. Sorry. I will analyze also the working of the MCU and i will post the result.

Thank you for your quick replay. the relays is working fine. i wait now for a replacement of mosfet until then i drawed the wiring diagram for understanding.

After a while of using SJK Technic Induction heater it suddenly died. I discover that the problem was begin from C2 (22nF/2KV) and culminated with the MOSFETs. If someone need the wiring diagram, i posted here. The microcontoller is an unknown chinese version but can be replaced by Attiny84 with...