RCA 1861, NTSC and a DEC VR-201

From: Pete Turnbull <pete_at_dunnington.u-net.com>
Date: Thu Sep 30 20:41:15 1999

On Oct 1, 1:28, Tony Duell wrote:

> Indeed (although occassionally you get a board where almost every
> resistor is one of the strange E96 values for not really good reason).

And surprisingly often in an RC circuit where the capacitor is +/-20%
tolerance :-(

> I am also convinced that a lot of transistors are chosen because that's
> what the designer happened to have in stock :-). Yes there are critical
> ones, but I could tell you some good stories about substituting all sorts
> of transistors with 2N3904s and 2N3906s and still having the device work
> _perfectly_.

There are other transistors besides 2N3904s and 2N3906s? You mean
BC109/184s, right? :-)

Pete						Peter Turnbull
						Dept. of Computer Science
						University of York
Received on Thu Sep 30 1999 - 20:41:15 BST

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