The MPF-102 is an "N-channel" transistor, and is turned off when the movable negative electrons in the transistor body are pushed out of the silicon, changing it to an insulator. You can also buy "P-channel" transistors which work backwards: their silicon is full of movable positive charges called "holes," and they are turned off by a positive charge on the gate. Try buying a few 2N5460
Very nice but traditionally a red color is used for the positive polarity (or north pole for magnetics) and blue is typically negative. Also an LED without a resistor is a bit risky for possible overcurrent damage to the LED.
I agree it's risky, but the JFET's intrinsic resistance (R_DS(on)) and the characteristics of the LED (forward voltage and current rating) play a role in limiting the current to a safe level because neither the LEDs nor the transistors have ever blown up on me. I've been looking for an RDS curve since for this JFET since you mentioned it and have not been able to find one. Now, I'm curious about that.
Is the gate the antenna and S the ground ? What is the configuration ? What field or hall transistor are you using ? Would J310 work ? Does Anode go to positive ? Which leg of the cathode goes to which leg of the transistor etc , You are providing half the information Thank you
@@parabugsknowingtheunknown. MPF102 is an N-Channel JFET, which is on unless the gate detects an electric field. Use a P-Channel JFET for electric fields of the opposite polarity. If the light stays on, you need to reset it by touching your finger on the gate, then move closer to the charge you want to detect and the LED will turn back on.
@@tetraederzufrequenztesla2342 No, the 2n2222 is a bipolar junction transistor (BJT), you need an FET (field-effect transistor). The gate is very sensitive to the surrounding electric field, which creates a potential (microvolts) difference between the gate and the drain. In the 2n2222, the base expects a current (micro amps) not a voltage to drive the collector current. That is, the BJT is a current-controlled current source while the FET is a voltage controlled current source.
Oh wow that's so cool! Thanks for sharing.
This is awesome!!! Before these idont know that field sensors can be made in very cheep price👍
This was a very helpful video and I will use this as my Science Project this year
The MPF-102 is an "N-channel" transistor, and is turned off when the movable negative electrons in the transistor body are pushed out of the silicon, changing it to an insulator. You can also buy "P-channel" transistors which work backwards: their silicon is full of movable positive charges called "holes," and they are turned off by a positive charge on the gate. Try buying a few 2N5460
Very nice but traditionally a red color is used for the positive polarity (or north pole for magnetics) and blue is typically negative. Also an LED without a resistor is a bit risky for possible overcurrent damage to the LED.
I agree it's risky, but the JFET's intrinsic resistance (R_DS(on)) and the characteristics of the LED (forward voltage and current rating) play a role in limiting the current to a safe level because neither the LEDs nor the transistors have ever blown up on me. I've been looking for an RDS curve since for this JFET since you mentioned it and have not been able to find one. Now, I'm curious about that.
Is the gate the antenna and S the ground ? What is the configuration ? What field or hall transistor are you using ? Would J310 work ? Does Anode go to positive ? Which leg of the cathode goes to which leg of the transistor etc , You are providing half the information Thank you
How do you make them react with positive and negative is the two different transistors
So where can I get some of those parts and what do I ask for?
the voltage, can we use 18650 Bat with volt out is 18650..??
Heb je een schema?
Qual transistor utilizou?
MPF102
Name of fet transistor
Electrostatic field detectors are what you've made...!!!
Do you have a drawing of how it is connected along with the value of the parts used?
Heb je een schema
Goed hoor
hi can you send parts list ?
what kind of transistor is it?
MPF102
@@sphynxusa what transistor for the positive and negative I built one with mpf 102 but the light stays on
@@parabugsknowingtheunknown. MPF102 is an N-Channel JFET, which is on unless the gate detects an electric field. Use a P-Channel JFET for electric fields of the opposite polarity. If the light stays on, you need to reset it by touching your finger on the gate, then move closer to the charge you want to detect and the LED will turn back on.
@@sphynxusa can I make that with 2n2222?
@@tetraederzufrequenztesla2342 No, the 2n2222 is a bipolar junction transistor (BJT), you need an FET (field-effect transistor). The gate is very sensitive to the surrounding electric field, which creates a potential (microvolts) difference between the gate and the drain. In the 2n2222, the base expects a current (micro amps) not a voltage to drive the collector current. That is, the BJT is a current-controlled current source while the FET is a voltage controlled current source.
It's fake when go up he loosing so bulp won't glow and if he press it flows