UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Indentifying transistor pinouts with a DMM

BulgingCap · 7th Jun 2017, 1:17 pm

We used to test with an Avo8 (on ohms x100 i think) by finding the base lead then connecting the black (+ve on an Avo) and the red lead (-ve on an Avo) to the other two leads. A wet finger between the open base and the black lead would cause a 'reduction' in resistance if the black lead was connected to the c of an NPN. If little change was seen then the black lead was assumed to be connected to the e, and the connections could be reversed to confirm. I have never tried it with a DMM.
BC

7th Jun 2017, 1:17 pm	#3
BulgingCap Pentode Join Date: Apr 2017 Location: South Coast, Western Australia. Posts: 129	Re: Indentifying transistor pinouts with a DMM We used to test with an Avo8 (on ohms x100 i think) by finding the base lead then connecting the black (+ve on an Avo) and the red lead (-ve on an Avo) to the other two leads. A wet finger between the open base and the black lead would cause a 'reduction' in resistance if the black lead was connected to the c of an NPN. If little change was seen then the black lead was assumed to be connected to the e, and the connections could be reversed to confirm. I have never tried it with a DMM. BC