Rory Starkweather
- Nov 13, 2014
- 77
- Joined
- Nov 13, 2014
- Messages
- 77
I was looking at an Application Note from Linear Tech. It suggested that connecting series regulators in parallel was more difficult than it looks. I'm wondering why this would be true.
I received 10 LM7809 in the TO-220 case today. I had planned to use two of them, in parallel, to power a 30 meter HAM radio receiver with several add-ons. The power supply is a 12 vdc, 1 Amp wall wart, and after I build this, I just want to forget it. I don't want any overheating problems.
I realize that the 7809 is rated for one Amp, but I'm paranoid.
The App Note mentioned an LT series regulator designed to be operated in parallel. In the schematic each had a 10mOhm resistor between the Ref pin and the output.Suppose they used 1 x 10mOhm resistor with both the references connected to it? The current wouldn't be a really big deal. Manufacturing differencs in 2 resistors might be , though.
Any thoughts on this?
I received 10 LM7809 in the TO-220 case today. I had planned to use two of them, in parallel, to power a 30 meter HAM radio receiver with several add-ons. The power supply is a 12 vdc, 1 Amp wall wart, and after I build this, I just want to forget it. I don't want any overheating problems.
I realize that the 7809 is rated for one Amp, but I'm paranoid.
The App Note mentioned an LT series regulator designed to be operated in parallel. In the schematic each had a 10mOhm resistor between the Ref pin and the output.Suppose they used 1 x 10mOhm resistor with both the references connected to it? The current wouldn't be a really big deal. Manufacturing differencs in 2 resistors might be , though.
Any thoughts on this?