I need bidirectional control anyway so with respect to the die heating/same package issue I could put one amp of each "channel" on alternate chips, spin one way and the lower output BJTs of chip 1, amp 1 and chip 2, amp 1 are switched fully on and saturated, while the upper output transistors of chip 1, amp 2 and chip 2, amp 2 are acting the power-burning emitter followers, and spin the other way vice versa
The offset voltages of the two op amps won't be matched that well, leading to current flowing between the two outputs. Ballast resistors keep that under control.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
This usually works:
-- John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
And Mouser never seems to be able to keep them in stock. :-(
I hope everything worked out. Surgery is scary, I got knocked out to get a finger worked on, and it took hours for them to get me back up to temperature.
George H.
Thanks, George. She's back home now, and walking with a cane. She managed the front porch steps like a champ.
There's a lot of crappy info out there about meds and diet and stuff, but the actual practice of medicine has improved a lot.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com
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