Recent content by Harrison G

But the calculations for R3 are done in such a way like I did, isn't that right?

Homework Statement Hello, guys! I just wanted to make sure I do this right. Homework Equations Forget about the rest of the circuit and focus only on Q2 and Q4. How to calculate R3? The Attempt at a Solution The way I do it: R3 is basicaly the emitter resistance which purpose is to regulate...

My excuses about the late respond. I was away for a bit and couldn't chat back. My thanks to all of you who answered to this thread. Thank you!

I don't understand the need of amplifier stages if i want for exmple to amplify a small AC signal. Sure i get that it is used to improve the gain, but isn't an RC transistor amplifier made in such a way, that the collector voltage is equal to half Vcc in order to have maximum swing. If so, why...

Thank you for the links and excuse me if i made it a bit hard to understand :-D but i got it. I am now learning about Ic's, op amps and such and i felt the need to go back and fortify some old knowledge.

Hello! I just wanted to make sure i get this right. So we prefer to use pnp transistors for low side switch because since then we basicaly connect the load to the collector we don't have to worry that the load(say a dc motor) will influence the base voltage and by influence the base voltage i...

You can shift the direction of an 3 phase motor by swaping two of its three phases. The speed depends on how hast the stator magnetic field rotates. So you can change the AC frequency if possible or change the supply voltage, but i recommend someone who works with electrical machines to reply to...

Hey, Billy, thanks for the link. It really got me deeper into transformer science;-)

Thank you, guys! I will now study the links you gave me. I already have a basic idea on how to calculate it. I will start with the core area. Then i will find the turns per volt. Then the primary current(by the way do i need this current so i can figure out what gauge of wire to use?), the...

While across the diode the voltage will be equal to Vcc(there is no voltage drop across it since no current flows, there is only applied voltage), the voltage drop across the resistor will be almost Vcc. Almost because the wire itself offers some resistance and so you got a voltage divider and...

Thanks all for the answers:-)

So far on transformers i have been studiyng them in Electrical machines. I know how they behave when the secondary coil is shorted, loaded and when no load is connected to it. I mean losses and such. I know the physics behind too. I also know that there is a ratio between the Voltage or turns of...

Hello! I am studiyng for electrical engineer and i think its finaly time to build a transformer myself. I don't do this, cause i need one, but rather to learn how to design it. I'll be happy if you give me instructions how step by step to calculate one. Not how to physicaly build it, but to...

Thank you everyone for the replies, but the situation is already under control :-)

Thank you :-)