Humming when computer is connected to stereo.

When I connected my computer to the stereo there was a lot of noise (hum).
The hum was caused by a ground loop between the cable TV ground (antenna) and the grounded outlet which the
computer was connected to.
A solution is to buy a cheap line transformer for audio use (ground separator, galvanic separator)
and place it between stereo and computer.

This one is from "Biltema" in Sweden.

Joystick adapter.

Amiga500/Commodore64 to PC.
This adapter enables you to use an old joystick (TAC-2) with no analog function.
The adapter makes the joystick behave as an analog joystick but with only three positions for
each direction (for example left ,middle ,right).
(For a more perfect function one should adjust the values of the 100k resistors.
As it is now the middle position is not exactly in the middle.)

joystick_adapter.pdf 12 392 bytes

Joystick adapter (analog 470k).

Amiga500 470k ohm to PC 100k ohm.
This adapter enables you to use an old analog joystick.
The adapter makes the joystick behave as an analog 100k ohm joystick.

joystick_adapter_2.pdf 10 015 bytes
I have NOT tested this therefore I do not know if it works in the same direction (left ,right).

Reading a Dallas semiconductor DS1820 without the use of a "UART" IC.
The timing in this protocol is critical so it’s not so sure the program works on all computers.
The connection of the DS1820 is a very simple one (LPT1) and only intended for testing of ONE sensor.
The programming (c++) is probably quite bad and only commented in Swedish.

thermo_ds1820.zip 19 219 bytes

Copyright Lars Andersson.
Feel free to build or make the things on this page but only for personal use.
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October 2000 by Lars Andersson.