"Don Pearce" wrote in message
news:49d0d0fb.430221593@localhost...
On Mon, 30 Mar 2009 14:51:17 +0100, "TonyL"
wrote:

As part of a low-fi audio system I need to drive a capacitive load.
Basically, the load is lengthy cabling with high impedances at the far
ends.
Total load capacitance with the length of cabling used is likely to be
around 50nF which I know is far beyond what many audio op-amps will
handle.
I've been staring at datasheets of ICs such as the LM8261, which can drive
capacitive loads but getting a bit punch drunk. Any recommendations ? Main
problem with the LM8261 is the packaging, I would prefer DIP-8.

TIA


Why not hang a 50 ohm resistor across the far end (assuming 50 ohm
cable, if 75 ohm cable make it a 75 ohm resistor), then you won't need
to drive a capacitive load. Plenty of op amps out there which will be
perfectly happy with that.

d

Good advice, but if for some reason that isn't possible, just use a low
power audio amplifier IC. 50nF is not a high capacitance to a small power
amp. Some of the small (1-5) watt ICs are designed for portable radios etc,
so aren't terribly hi-fi, but you did say it was for a lo-fi application.

S.

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