gavinbirss
Head-Fier
- Joined
- Oct 19, 2001
- Posts
- 83
- Likes
- 11
Hello,
It there anyone that would agree that most op amp headamp combo's have the inability to achieve more that 30V p-p and thus do not have the voltage swing to drive >= 600 ohms ?
Most op amps swing more that 2V from the supply and this limits the gain you can choose accordingly.
I was thinking that the following design with tackle this problem.
Sorry about this but this link needs to be opened in a window since remote linking if not allowed where I stored the picture.
Note : That the resistor and cap values are arbitrary and can be substituted with any other value of choice.
I have made a prototype but found that with my poor power supply and 0.5 ohms resistors instead of 4.7 ohms resistors is causing the OPA604 to heat up. (more that what I would like).
Combining a op amp and buffer as with the BUF634 there is no thermal affect on the op amp. The OPA547 is not a buffer and is used as a op amp and I may need some help here but I think in this circuit the op amp is affected thermally.
My idea with this circuit was to provide for 40 V p-p and 500-750 ma of current. I was thinking that this unit would provide enough guts to drive say the K 1000.
What do you guys think ? Please be gentle.
Gavin
It there anyone that would agree that most op amp headamp combo's have the inability to achieve more that 30V p-p and thus do not have the voltage swing to drive >= 600 ohms ?
Most op amps swing more that 2V from the supply and this limits the gain you can choose accordingly.
I was thinking that the following design with tackle this problem.
Sorry about this but this link needs to be opened in a window since remote linking if not allowed where I stored the picture.
Note : That the resistor and cap values are arbitrary and can be substituted with any other value of choice.
I have made a prototype but found that with my poor power supply and 0.5 ohms resistors instead of 4.7 ohms resistors is causing the OPA604 to heat up. (more that what I would like).
Combining a op amp and buffer as with the BUF634 there is no thermal affect on the op amp. The OPA547 is not a buffer and is used as a op amp and I may need some help here but I think in this circuit the op amp is affected thermally.
My idea with this circuit was to provide for 40 V p-p and 500-750 ma of current. I was thinking that this unit would provide enough guts to drive say the K 1000.
What do you guys think ? Please be gentle.
Gavin