Another P.I. link

hello xavier ,

there is more off time than 30 us ,

on my program , 200 hz is 5 mS cycle , so you want 5ms delay - 160us  on time .

hello 6666 ,

 ref :pins 4 and 8 , pin 4 is neg , but pin 8 on a 741 is no connection , pin 7 is + top rail

yes xavier , piezo sounder with built in driver could be used as a total replacement for the audio 555 at the end ,

but , the human ear can detect  pitch changes better than volume changes , the 555 is set up to increace pitch from a click to a tone with voltage change , which gives a varing note dependant on signal strength for target indication ,

also the peizo would be nearly allways on , my experiance is that a 12V sounder will sound from 3V upwards ,
think it would be less sensitive to target changes ,

only a thought.

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http://www.thunting.com/smf/index.php/topic,3797.msg191035.html#msg191035

Hi Dooley

Some how I thought that, that would be the reason for the 555 audio but that only daunt on me when  pressed the sent button LOL any how I'm about 3/4 way done with the PCB I'll post it as soon as I'm done so that you may have a look to see if I could have made any errors.

All the best
Xavier 

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http://www.thunting.com/smf/index.php/topic,3797.msg191056.html#msg191056

Xavier

no panic about the pin bit 6666 , it happens to us all ,can't see the wood for the trees and all that ,

xavier , your working on a pcb ? are you going into production with the slightly hacked about / modified design ?



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http://www.thunting.com/smf/index.php/topic,3797.msg191076.html#msg191076

hello xavier ,

had a look at all 3 files and layout pic , very tidy pcb , looks very pro ,

tried to get my head round it , but ive done schematic's to strip board for years in my head and find pcb's hard to follow,

will have a sit down and a very good look at tomorrow , might help my brain if i do a component overlay on the pcb
to ease my brain strain .

oh , the delay and width of the 4538 are onboard , with those many turn pots .

other than that , cracking job ,nice.

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http://www.thunting.com/smf/index.php/topic,3797.msg191114.html#msg191114

  Hi DOOLEY1972 
               I greet you and I am enjoying this discussion and what YOU , 6666 and                xavier do to perhaps help anyone, whether the project or ideas in a way - weak point that there was no comparison the results of the project before   Added.

 Hi xavier
        ******  Beautiful work ***** thanks
   most beautiful Members in the most beautiful place.

best time

j.

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