Category 5
Well-known member
I am going to be matching some transistors for Fabio's op-amp boards aqnd was wondering If I can do this.
I have ordered some 741 op-amps to make the transistor test circuit. It needs +/- 10v to work. Since I don;t have a spare power supply I can use I was thinking of using 9 volt batteries.
Can I wire one correctly (tie - to ground) and the other one backwards (just tie positive to ground and use the - as my - voltage source)?
In my mind this sounds like it will work. Most of the 9 volt batteries I have tested give off about 9.4 volts which seems like it should be enough to get the matching circuit to work properly. I would hate to have to build a power supply just for matching transistors.
I figure if all goes well I can get a hundred or so transistors. I'll match them into pairs, and I can surely share pre-matched pairs with other in the group looking to build op-amps as well.
Shane
I have ordered some 741 op-amps to make the transistor test circuit. It needs +/- 10v to work. Since I don;t have a spare power supply I can use I was thinking of using 9 volt batteries.
Can I wire one correctly (tie - to ground) and the other one backwards (just tie positive to ground and use the - as my - voltage source)?
In my mind this sounds like it will work. Most of the 9 volt batteries I have tested give off about 9.4 volts which seems like it should be enough to get the matching circuit to work properly. I would hate to have to build a power supply just for matching transistors.
I figure if all goes well I can get a hundred or so transistors. I'll match them into pairs, and I can surely share pre-matched pairs with other in the group looking to build op-amps as well.
Shane