Superscan PI

[nasios]

correct

in my eye all is correct, the heat maybe is in normal degree (i finish before few days the felejoo pi and have heat and when i use aluminium for cooling is ok) the coil i don't understand why make noise , you can shere a photo of coil? maybe is very open the loop?

[ZOUjiarui]

correct

[ZOUjiarui]

The waveform at position 1kHz is the same 90Hz, which was my mistake. Figure 2 is correct; the pulse width is 0.47ms, and the waveform is clearly not a square wave.

[ZOUjiarui]

The 555 timer frequency is correct, but the frequency of the 1k resistor at pin 3 is fluctuating wildly, while the coil frequency is correct. The MOSFET is still generating heat, and the coil is still making noise. Please help me, thank you very much.

[ZOUjiarui]

The PCB itself is fine; the problem lies with the characters. My test results are still not quite right, and I need someone with experience to give us some pointers.

[ZOUjiarui]

maybe is too fast the hz and work fast the mosfet you have to use oscilloscope
you can share the pcb for i try?

Hello, the handheld oscilloscope is on its way, and I will remeasure it. There are no secrets to the circuit board; just solder the components according to the hand-drawn circuit diagram.

[nasios]

Hello. This is abnormal; it heats up rapidly, becoming scalding to the touch within 1-2 minutes.

maybe is too fast the hz and work fast the mosfet you have to use oscilloscope
you can share the pcb for i try?

[GeoMax]

Hi ZOUjiarui,

An oscilloscope would tell you whats wrong with your circuit.... and were you should fix it.

[ZOUjiarui]

Hello. This is abnormal; it heats up rapidly, becoming scalding to the touch within 1-2 minutes.

[nasios]

https://youtube.com/shorts/60rjpFvCFThe coil was retested: 10cm diameter, 0.6mm diameter, 1R voltage, 460uH. After powering on, the MOSFET and coil heated up rapidly, the coil emitted a buzzing sound, and the MOSFET stopped making any noise.YE?si=KLx7pDSTER6fFteg

Mosfet is hot or normal?

[ZOUjiarui]

https://youtube.com/shorts/60rjpFvCFYE?si=IUDfxIn9SXdSxeUJ

[ZOUjiarui]

https://youtube.com/shorts/60rjpFvCFThe coil was retested: 10cm diameter, 0.6mm diameter, 1R voltage, 460uH. After powering on, the MOSFET and coil heated up rapidly, the coil emitted a buzzing sound, and the MOSFET stopped making any noise.YE?si=KLx7pDSTER6fFteg

[nasios]

Hi yesterday i finish the felejoo pi, with 0.5 wire in 40cm a coin in 30cm a cola in 45cm, i will order 0.8wire for i try and 1x1 coil

[GeoMax]

Detectorist#1 is here a user at Geotech Forum.

Bipolar PI MD with GB and DD Coil - Geotech Forums

[nasios]

Hello Eduardo1979

Here is an example of one of the circuit diagram and printed circuit boards I made for Detectorist#1. The circuit shown here is for a two-tone pulse detector developed by Detectorist#1. There is also a separate post about it with more information about this bi-pulse detector.

Hi Geomax, what is Detectorist#1 magazine?