harry dalek wrote:The signal level from the sensors still to high to record off scale on the pc sound card recording program ...even with no light levels tried to drop the voltage to the sensor that drops the sound level also drops its the sensors level so i think i need to just put a pot in and see .
Sorry Harry, what do you mean "with no light levels"? Are you saying you are getting high output from the sensors even in dark conditions? That would probably mean you are picking up RF (e.g. motor noise) or the circuit is going into oscillation.
I am confused here because didn't you show us the circuit working with your hand waving in front of it?
Are you still using the mic input or have you moved to the line input?
What levels do you measure when you display it on your CRO?
Have you tried reducing the gain on the record channel using the PCs mixer?
Motor noise is a problem at the best of times - and one reason I decouple all of the sensitive circuitry by running from batteries to begin with - that doesn't help the rf (that's why you enclosed it in a metal box) but prevents the noise being coupled into you circuit via the power rails. - even so - the motor noise won't prevent you getting a picture - it'll just show up as spots in you picture - you can see them in them in my example that you posted a link to at the beginning of this thread.