Hello @sghioto @MisterBill2 @crutschow and the AAC forum,
Have posted on this project at
Post name: Transistor datasheets 210503
Disappointed because it was thought that project was finished and was ready to install
in the closet. But the circuit was left running for half an hour, turning on off from
my movement around the room and I looked over and there was a puff of smoke.
This the latest schematic.
Not sure what blew. By the time I could get the power turned off it was hard tell visually which component fried but it seemed like Q2 was warmer than anything else.
Thought I had solved the hyper current issue. First a signal transistor, a BC547 was used at Q2. It got hot and so the BC547 for Q2 was replaced with a AUIRF540Z.
Did not seem to have heat problem with Q2. The data sheet, attached, indicates (I think) that the transistor is good to 36 amps.
So trying to figure out
1. Why the circuit smoked?
2. If the problem is Q2, the AUIRF540Z, why it overheated?
Any insight would be greatly appreciated.
Thanks.
Allen Pitts, Dallas Texas
Have posted on this project at
Post name: Transistor datasheets 210503
Disappointed because it was thought that project was finished and was ready to install
in the closet. But the circuit was left running for half an hour, turning on off from
my movement around the room and I looked over and there was a puff of smoke.
This the latest schematic.
Not sure what blew. By the time I could get the power turned off it was hard tell visually which component fried but it seemed like Q2 was warmer than anything else.
Thought I had solved the hyper current issue. First a signal transistor, a BC547 was used at Q2. It got hot and so the BC547 for Q2 was replaced with a AUIRF540Z.
Did not seem to have heat problem with Q2. The data sheet, attached, indicates (I think) that the transistor is good to 36 amps.
So trying to figure out
1. Why the circuit smoked?
2. If the problem is Q2, the AUIRF540Z, why it overheated?
Any insight would be greatly appreciated.
Thanks.
Allen Pitts, Dallas Texas
Attachments
-
691.1 KB Views: 0