Thank you all for your detailed input and especially mariss for the design. I have very limited electronics background (mechanical to be exact) and I have been reading and reading and reading about stuff.....
I will remove the gate resistor and the diode. The led and the attached cap will also disappear.
I did find out that with my original design the voltage available at the gate for the mosfet is half of the voltage supplied to the 2N3904 and the pull voltage is just a tad bit less than the signal voltage.
I do agree with NC CCAMS that Mosfet Drivers are made to make life easy. But One thing people have to remember that not all are blessed with having access to such components. So it comes down to making do with what is available in the market that suits ones purpose. It also becomes a very encouraging learning exercise. Things like film resistors, Logic Level Mosfets, High speed diodes, Mosfet drivers are seldom available and if one is lucky might get some 2nd hand..?? recycled..Components that we get are usually chinese made so whatever the data sheets say about them everything is down graded by 75%.
This results in a very different way of thinking! Software simulation just cuts some of the costs of blown up components and also does the mathematics for someone like me who is learning to read the datasheets properly!
A scope is a luxury. But yesterday I did manage to pick a 2nd hand LBO-310 scope for a princely sum of 4 dollars (equivalent). It wasn't working so I gave it to a friend of mine who thinks he can get it working (he wants to use it too!). Hopefully that will be a valued addition to my soldering iron, maginifying glass and multimeter.
I have always enjoyed reading your posts and comments and have learnt a lot from them.
The list of do's and don'ts goes on the wall for me to see all the time. Once I have completed the schematic of what I am doing I no doubt will post it for further comments and learning.
EmmKay  |