On Sunday 21 March 2010, Andy Pugh wrote: >On 21 March 2010 15:39, Paul Keeton <pkeet...@woh.rr.com> wrote: >> Each VFD requires a minimum of 70ma to run. We had to put >> a small phoenix contact amp on it to boost the analog signal to run all >> three drives on that machine. > >70mA is quite a lot, really. However there are op-amps that can handle >that amount of current (and being op-amps are perfectly happy on a >double-rail supply for +/-10V operation. > >http://docs-europe.origin.electrocomponents.com/webdocs/0024/0900766b800246 >97.pdf > >Would do the trick, it could probably be mounted in heat-shrink in the >cable, though there are clearly neater ways. > He would need one of those per vfd. And I would recommend a heat sink of the type that clips on from one end, with its retaining clip going under the chip as it sits in the socket. We used to use those on the 5532 that the audio makers fell in love with, but which in reality was actually a pretty poor device.
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