jstark
Well-known member
I'm a college student. I'm poor. Transformers are the bane of my DIY existence. I want to build circuits without them.
So, modifying the Country Hick DI, available at : http://www.diyfactory.com/projects/countryhick/countryhick.htm
I have this:
This should work, right? I just have to choose R1.
Here's my R1-choosing-logic, please tell me where it's wrong: The original circuit is driving a 2.5:1 trafo, which is pushing, say, a 600 ohm load. So the output transistors were designed to see a 2.5*600 = 1k5 ohm load. Applying this to the opamp circuit, R1||R1 = 1k5 ohm, thus R1 = 3k ohm.
Is that right?
Assuming I'll never hook this to unbalanced gear, would the cross-coupled opamp scheme offer any significant advantage over this one?
Thanks in advance,
David
So, modifying the Country Hick DI, available at : http://www.diyfactory.com/projects/countryhick/countryhick.htm
I have this:
This should work, right? I just have to choose R1.
Here's my R1-choosing-logic, please tell me where it's wrong: The original circuit is driving a 2.5:1 trafo, which is pushing, say, a 600 ohm load. So the output transistors were designed to see a 2.5*600 = 1k5 ohm load. Applying this to the opamp circuit, R1||R1 = 1k5 ohm, thus R1 = 3k ohm.
Is that right?
Assuming I'll never hook this to unbalanced gear, would the cross-coupled opamp scheme offer any significant advantage over this one?
Thanks in advance,
David