First post, by retardware
- Rank
- Oldbie
I am thinking about a circuit to connect the PC speaker to my sound cards' line input.
The circuits I found on the forums are not applicable to my mobos' speaker circuit, because it does not have the "normal" open collector driver against 5V, but some different sort of amplifier.
So I am thinking about something like this:
The first (left in the schematic) pot serves to fine-align the RC filter which smoothens the digital edges of the speaker on/off switching.
The second (right in the schematic) pot serves to adjust the circuit output to a correct line level.
Now I wish I could use some PC speaker utility, with adjustable frequency selection, so I can do these alignments easily using the oscilloscope.
Does anybody know of such a program, ideally for DOS? Or maybe for Windows 95/98?
Edit: I guess the both 47R resistors should be made 470R at least... they are needed to limit the speaker amplifier output current... no idea yet which voltage levels it puts out.