A while ago i run across this document which apparently tells how to wire mosfets in series to get higher voltages (pg 10-14). This is the only schematic i found so far that is actually working. The problem is that i can`t make more than 3 mosfets work, when i add a fourth ( with the same circuitry) it remains OFF no matter what. I tried different
Click here to download the full size of the above Circuit.
resistor values. At first i though that if R2 has 2ohms and R3 20ohms that the next should be 200ohms. When it didn`t work i tried 20, 50 and 1k but with no luck. Can you please tell me what i did wrong You need to post your circuit and indicate voltages used, I would suggest looking at the voltage V3 mentioned in the paper relative to V1. I wouldn`t really expect there to be a resistor value problem with this circuit. I don`t think your circuit will work. You`ve omitted the diode from the 12VDC supply to the MOSFET gates. I would use an individual diode from the +12V supply to each gate, and I would replace the gate-source diodes with zeners to protect the gate. Then I think it would work. But why are you doing this MOSFETs that can switch 350V are readily available. Hey i`m no expert but isn`t it a "protection" matter i may do it so not to blow up anything, but the problem is that i can`t make Q4 even switch on, thats why i stripped everything out to try it as the paper suggests. Hey i`m no expert but isn`t it a "protection" matter i may do it so not to blow up anything, but the problem is that i can`t make Q4 even switch on, thats why i stripped everything out to try it as the paper suggests. Oh sorry. I foolishly thought that it would be helpful and important to prevent you from blowing up your MOSFETs. Of course, you can just add the zeners later, if you can be bothered. If you make the changes I have suggested (diode...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: