Re: IIgs to arcade monitor experiment

[Michael Black <et472@ncf.ca>]

On Fri, 25 Apr 2008, MdntTrain wrote:

> On Apr 24, 3:50 pm, "Ferdinan Meyer-hermann" <ferdinan.meyer-
> herm...@a2central.com.remove-dxr-this> wrote:
> >   To: ferdimh
> >   Re: Re: IIgs to arcade monitor experiment
> >   By: ferdimh to comp.sys.apple2 on Thu Apr 24 2008 01:17 pm
> >
> > Just for clarification, I drew a schematic how I would build it:http://ferdimh.homelinux.net/apple2/gs2arcade.png
> >
> > Q1 can be any general-purpose transistor. R2 might need some tweaking to get
> > the black level right.
> >
> > Ferdinand
> > --- Synchronet 3.14a-Win32 NewsLink 1.85
> > A2Central.com - Your total source for Apple II computing.
>
> Very generous of you to provide a diagram.   Are you using some kind
> of software to make these designs and drawings, like a SPICE
> variant?    I think I'd better get something like it.
>
> Curious about two things:
>
> 1) is this common base amplifier an inverting amp?
> 2) is there an analog to this voltage amplifier common base
> configuration using tubes instead?
Grounded grid is the same arrangement with tubes.

Relative low input impedance, relative high output impedance, and not much
gain.  Really useful to transform impedance from low to high, and
often good if you need some gain but don't want to fuss with instability.

And it's a non-inverting stage.

   Michael