Hi Guys,
As part of a project, I'm required to build a sound activated device to start a tape recorder. This is the first electronics course I have done, so I'm still pretty much electronics-illiterate. Anyway, I've been looking through books and on the net (seems there are quite a few similar projects on these forums), and I think I'm getting somewhere.
It must,
- Filter out frequencies of below 100Hz
- Have a timer to record from 1-10min (User adjustable)
- Be battery operated
So far, I've figured that I need
- Condensor Mic
- Op-amp (Non-Inverting amp)
- High Pass Filter
- Some sort of timer
- Transistor switch
I'm still unsure about how I will provide a user-adjustable 1-10 min timing option.
Am I on the right track? I'd appreciate any comments or ideas. Thanks.