Hi all

I got a few questions to Erik's 12 step cure

I agree very much, that yuor '51 MUST be bypassed, both with a 100 nF ceramic and with 4.7 to 10 µF electrolytic cap, but why tantalums? In my textbook, the autor states that the big thing about tants. are the small size, and their low leak. The big problem is their attemt to short when dryed out. God tants. are also expensive.
Why not use ordinary or low esr electrolytic caps?

"Put the thing in a steel box"

Okay, but should'nt it also be a magnetic box?

"Do not drive capacitive loads (like ribbon cables) directly from Uc outputs, buffer them with TTL or CMOS buffers (140-144)"

What about using a pull up resistor. The datasheet for 80515 states that "high" is 2.4V with 80 µA behind it. Thats a verry high Z input. With a pull up in order of 5-10 K, (at Vcc 5v) you should be far better of.

Any comments apreciated

Ha' en sjov dag

Per Guldmann