Search found 4 matches

by andyroy15
Mon Mar 08, 2004 3:07 pm
Forum: General Discussion
Topic: Pre-amp Circuit Help
Replies: 21
Views: 2671

Re: Pre-amp Circuit Help

Thanks for all your help, hopefully this will clarify a few points:<p>The idea is to time the difference between a pulse being received at two different array elements by triggering a comparator on one of the initial oscillations of the signal.<p>When testing I used a pre-made preamp of 80dB (in ter...
by andyroy15
Wed Mar 03, 2004 4:49 am
Forum: General Discussion
Topic: Pre-amp Circuit Help
Replies: 21
Views: 2671

Re: Pre-amp Circuit Help

Again, sorry, I need a gain of at least 10000. So in voltage terms it is 80dB. It's also been a few years for me too!<p>Would there be any side effects to using 2 40dB amps to multiply up to the total 80dB?<p>[ March 03, 2004: Message edited by: andy15 ]</p>
by andyroy15
Wed Mar 03, 2004 1:42 am
Forum: General Discussion
Topic: Pre-amp Circuit Help
Replies: 21
Views: 2671

Re: Pre-amp Circuit Help

Sorry, should of clarified the gain, its 40dB in terms of signal, so I need a gain of at least 10000.<p>Thanks for the help
by andyroy15
Tue Mar 02, 2004 8:31 am
Forum: General Discussion
Topic: Pre-amp Circuit Help
Replies: 21
Views: 2671

Pre-amp Circuit Help

I am currently trying to build a 40dB pre-amp for an array of acoustic transducers receiving 0.5ms burst signals at 70KHz, and need a bit of help.<p>The complication is that it needs to be fairly small and portable, and run on a -9 to +9 volt battery supply. The current circuit of a series of 741's ...