Hardware Hobbyists vs. Emulator Jockeys
mcguire at neurotica.com
Wed Jun 17 17:47:28 CDT 2009
On Jun 17, 2009, at 6:26 PM, Eric Smith wrote:
>> While I agree with you here, I have to admit that, if my
>> PDP-11/70 had switching power supplies, I'd probably run it a lot
>> more often. I'd *never* make it an irreversible modification,
> Unless you've already replaced them with something else, your
> PDP-11/70 *DOES* have switching power supplies!
I'm looking at the schematic for the H744, and I see an LM723 with
a big fat 2N5302 (Ic=30A) wrapped around it. Now, I'm aware that the
LM723 can be used in a switching regulator topology, but at first
glance that's not what it looks like to me.
I'm somewhat embarrassed to admit that, because I've repaired
probably a dozen H744/H7441 regulators, including one just a few
weeks ago in my newly-acquired PDP-11/50.
So...are you certain?
Port Charlotte, FL
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