Simple DIY DVM Voltage Reference

[ppppenguin]

Back in 1991, long before I had email, I wrote (by fax) to Jim Williams. Got a snail mail reply which I have kept. Here's the first page of his reply.

JW was truly one of the greats. Along with Bob Pease and Barry Gilbert. There may be a couple I've missed but we're still talking of just a handful. These are the guys who created analogue ICs as we know them. Opamps, voltage regs, comparators and much more.