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From: dalloff@freenet.columbus.oh.us (Dave Althoff)
Newsgroups: comp.sys.apple2
Subject: Re: Paddles
Date: 17 Oct 1995 01:03:20 -0400
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(Q:  Can one obtain Apple ][ paddles)

You could build your own...they are extremely simple.  The toughest part
is finding a 150K-ohm linear potentiometer.  The circuit is something like
this...

                                  150k ohms
           +5v-------------------/\/\/\/\/\/\--------|
                                      ^              |
           PDL(n)---------------------|              |
                                                     |
           Gnd----------------------------------------
                               |
                       |       |
           PB(n)_____.---._____|

Okay, so as a schematic, it's pretty awful.  And the button input might
need to connect to +5v instead of ground; it has been a long time since I
built mine.  But you get the idea.  If you need the pin-outs of the game
connectors, I have those around here someplace.

--Dave Althoff, Jr.
-- 
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From: adrianw@cassius (Adrian Whichello)
Newsgroups: comp.sys.apple2
Subject: Re: Paddles
Date: 19 Oct 1995 23:52:22 GMT
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In article <45vdeo$c0n@acme.freenet.columbus.oh.us> dalloff@freenet.columbus.oh.us (Dave Althoff) writes:
>(Q:  Can one obtain Apple ][ paddles)
>
>You could build your own...they are extremely simple.  The toughest part
>is finding a 150K-ohm linear potentiometer.

Other values can be used, provided you compensate by changing the 0.022uF
capacitor to maintain the same RC time constant (which is 150Kohms x 2.2nF =
3.3ms with the supplied values). It's easiest to do this be decreasing the R
and then connecting a suitable capacitor from the wiper arm of the pot to
ground in your homebuilt paddle box, to avoid having to replace components on
the Apple motherboard. I did this with a couple of RS joystick controllers
(100Kohm) I picked up for two dollars, by putting in an extra 1.1nF capacitance.

Adrian.