Search found 3 matches

by tgsimmons
Wed Jun 30, 2004 7:53 am
Forum: General Discussion
Topic: audio impedance matching/volume control
Replies: 3
Views: 982

audio impedance matching/volume control

I've got a low power (50 mw), 16 ohm differential (sp+, sp-) audio output from a Winbond ChipCorder that I want to feed to a single input audio amplifier with a 20-40K input impedance (Hitachi HA1318). I also need to control the volume in the process. What's the best method of doing this?
by tgsimmons
Tue Feb 10, 2004 8:44 pm
Forum: General Discussion
Topic: Non-audible control tone on a CD
Replies: 6
Views: 1181

Re: Non-audible control tone on a CD

Thanks for all the great suggestions. It sounds like the LM567 is what I'm looking for. I've read over the data sheets and I think it's perfect for that application. Now it's time to order some and try it out. I'll let you know how it turns out.
by tgsimmons
Tue Feb 10, 2004 1:15 pm
Forum: General Discussion
Topic: Non-audible control tone on a CD
Replies: 6
Views: 1181

Non-audible control tone on a CD

For a Halloween prop I'm working on, I need to have two seperate audio tracks on a CD, but also need a control track to trigger a prop. I was thinking of recording a non-audible tone on one of the tracks, maybe 22-25khz (something that would still be within the range of a standard audio CD player), ...