viper
Titanium
- Joined
- May 18, 2007
- Location
- nowhereville
Wanting to hook up with someone that might take pity on my electronics ignorance and allow me to email a few questions to better understand some basics in designs.
Example, I am looking at a pair of MOSFETs in a PS. Obviously 1 is certainly shorted but I would like to work more on a test circuit or learn if the DMM diode testing is a satisfactory test method.
Also looking at a couple NPN transistors where I am testing across emitter to collector with the meter and get OL one way and 15M the other. BUT, on the next identical transistor, I get 15K both ways...
I also made a test circuit with a a 5V source and an LED to test and seems to work decent for the MOSFETs but not so much on the NPN transistors.
Next example is where I screwed up and installed an MOV in place of an ICL because I could not ID the part. Obviously no harm was done, just did not conduct any power... DUH! I am coming around that MOVs are usually in parallel to absorb transients and ICLs are always in series. The one in question had a pin hole and was NOT shorted or lets just say it is 15 ohms which I think is about right at 75F.
Anyway, you can see by my questions that I have been around the stuff but I am still a ways from EE status.... My goals are just to be able to ID common problems in PS and amplifier problems. A huge problem I have is finding data on components that are poorly marked. Example is this ICL that is marked DSP 104...
Example, I am looking at a pair of MOSFETs in a PS. Obviously 1 is certainly shorted but I would like to work more on a test circuit or learn if the DMM diode testing is a satisfactory test method.
Also looking at a couple NPN transistors where I am testing across emitter to collector with the meter and get OL one way and 15M the other. BUT, on the next identical transistor, I get 15K both ways...
I also made a test circuit with a a 5V source and an LED to test and seems to work decent for the MOSFETs but not so much on the NPN transistors.
Next example is where I screwed up and installed an MOV in place of an ICL because I could not ID the part. Obviously no harm was done, just did not conduct any power... DUH! I am coming around that MOVs are usually in parallel to absorb transients and ICLs are always in series. The one in question had a pin hole and was NOT shorted or lets just say it is 15 ohms which I think is about right at 75F.
Anyway, you can see by my questions that I have been around the stuff but I am still a ways from EE status.... My goals are just to be able to ID common problems in PS and amplifier problems. A huge problem I have is finding data on components that are poorly marked. Example is this ICL that is marked DSP 104...