protection circuits (swith circuit)

[linxiaoxin]

Originally Posted by godfrey

Switch 2 functionality would be very difficult with transistors. With a relay, it is very easy. Switch 2 just has to connect 45V to the coil of the relay. Something like this would be good: PCB Relay DPDT 8A 48Vdc

can you draw a picture ? i a little do not know what you mean

if use transistors? can we add a logic inverter as i used in the original picture to make the q5 on ?

[godfrey]

Originally Posted by linxiaoxin

can you draw a picture ?

Oh, OK. sigh...
I don't know how to do it with transistors.
This is with a relay. Why don't you Google "relay"? It is easy to understand.

[linxiaoxin]

Originally Posted by godfrey

Oh, OK. sigh...
I don't know how to do it with transistors.
This is with a relay. Why don't you Google "relay"? It is easy to understand.

thank you for concerning about this topic ,i have a lot of thing to do at this moment, i am away from campus to to take an examination. and i can not concentrate on my design ,several days later,i will have the time .
thank you very much . my name is lin xiao xin. i am a man of making with friends.have you used the qq Chat Tool ,or you just used the msn ?

actually,my tutor ask me to do it with transistors,because the transistors swith frequency should be 1 mhz. it is to say that the switch time should be controlled at 1 us. and the relay can not reach it.

[DF96]

Another student assignment? Ensure you mention DIYaudio in your submission, so your tutor knows how to assign marks between you and us.

[godfrey]

Originally Posted by linxiaoxin

actually,my tutor ask me to do it with transistors....

I will be very interested to see how you do that. I do not know how.

Originally Posted by linxiaoxin

....because the transistors swith frequency should be 1 mhz. it is to say that the switch time should be controlled at 1 us.

Someone is going to press the button a million times per second?