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  • I made a nice circuit board for the barra months ago maybe shall populate it soon.
    Has anybody here done a lcd setup for this project yet?
    Just a thought

    Regards

    Comment


    • hello

      what should this lcd display?

      detection depth or still "target found"

      the only what i have palnned ws to connect a lm3914 vu meter to show signal strenght via led insted of usinf headphone ore one singel led

      regards

      Comment


      • Ok Barracuda is running now. Question about coils and sheilds.

        After working on my surf pi for a couple days I decided to pick the barracuda up again.Idont know what I had done but the mosfet was dead,and I smoked the 2n2222 poking around with a jumper.Now when I figured out what was going on i stoped and went to town for a pin vise to clear out the holes in my board as I have been having a terrible time replacing components.I didnt find the pin vise but I found circuit board reamer and assorted other tools at harbour freight tools.Man this thing has saved my life,you may not use one I dont know but for me that reamer is the cats pajamas.Ok so the only mosfet I had was the irf9520 which I want to use anyway since it has around 170pf Coss instead of 370pf like the 9640.However it is a 100v device,which may or may not be a problem.I have had much better results with this mosfet in my testing on the surf and barracuda so far.I replaced the mosfet and the 2n2222,and away she went,semi smooth threshold.Checked the preamp output and no ring with a 550ohm resistor,so I set the offset,and the delay.All the while I am monitoring temperature of mosfet.This is where it gets interesting or maybe confusing,the preamp is in saturation for about 20us so I can only sample as soon as 25us or so,I suspect this is due to the coil is 444uh 11" and 1.6ohms,24awg teflon,no faraday sheild yet.4 ft of rg62, with the barra's tx pulse width I guess it is what it is.So with these settings I get ok detection distances so I decide to check the damping and see if I can loosen the coil up some.I goes all the way to 1.5k with no ringing,I dont understand it.Much better sens now,still not where I want to be yet but getting there.Do I need a sheild if I sample at 25us? My threshold comes up near the end of my pot travel,is that normal? What is up with this coil damping at 1.5k? What is the best coil for your barra?I see alot of 25-30cm claims on here and I am not there yet.I gona post some pics for you guys.

        Comment


        • Here is some pics of my madness.
          Attached Files

          Comment


          • icl 7660 problem

            hello

            i have a problem with the icl 7660
            after switch power on it becomes hot very fast
            no idea where the problem starts
            coil hooked up and no sound at headphone
            have build it like the two other pcb
            but this is first time i have problem at icl 7660

            maybe it is a broken icl 7660

            any idea?


            rgards bernd

            Comment


            • hello

              maybe there was wrong printing on pcb (red one)
              and i have to invert 79l05 and 78l05?

              i dont know anymore will check it this evening
              or are there different types of 79l05 and 78l05?

              regards

              Comment


              • hello

                i replaced icl7660 and measure 78l05 and 79l05
                78l05 gnd and out 6V
                79l05 gnd and out-0,9 V

                is this normal 78l05 get hot very quick when i replace the icl7660

                if anyone can say what i should measure in this situation i would be a help

                regards

                Comment


                • On all my barra boards the 7660 is dead cold and I measure around + and - 5 volts

                  Comment


                  • Originally posted by bernte_one View Post
                    hello

                    i replaced icl7660 and measure 78l05 and 79l05
                    78l05 gnd and out 6V
                    79l05 gnd and out-0,9 V

                    is this normal 78l05 get hot very quick when i replace the icl7660

                    if anyone can say what i should measure in this situation i would be a help

                    regards
                    Sounds like something wrong with 7660
                    I'd give the bottom of the pcb a good clean
                    Measure 7660 pins 5,8
                    78l05 input voltage ?
                    The Red ApBerg pcb I supply is correct for silkscreen for all the ones I have made

                    Comment


                    • Originally posted by bernte_one View Post
                      hello

                      i replaced icl7660 and measure 78l05 and 79l05
                      78l05 gnd and out 6V
                      79l05 gnd and out-0,9 V

                      is this normal 78l05 get hot very quick when i replace the icl7660

                      if anyone can say what i should measure in this situation i would be a help

                      regards
                      7660 pin 8 is Batt voltage 12v max for 7660,pin7 is clock pin and has a capacitor charging wave form on it If I remember correctly,pin 6 not used,pin 5 is the invertered Batt voltage -12v,pin 4 has a negative going square wave,pin 3 is ground,pin2 has a positive going square wave on it,pin 1 not used. I would take the regulators out of circuit before I went any further,the 7660 is the most expensive chip on the board.

                      Comment


                      • hello

                        thanks all for answer

                        red colored pbc has correct marking i checked it
                        same good quality like everytime

                        but bad components (my own components laying around here)
                        not from silverdog

                        i supposed that the a different pinout version from 79l05 and 78l05 but it is not so checked it with datasheet and alright so

                        changed icl7660 to 7660s same problem when i take the 7660 off pcb the 78l05 get hot very quick

                        i think problem is at 78l05 or the diode 1n4148 nearby
                        will check all tomorrow with fast measuring


                        feel not good today
                        big climate change here from 30degree celsius to 12 degree
                        makes me tired

                        regards bernd

                        Comment


                        • Barracuda acting up today

                          Now the other day I replaced the mosfet and the 2n2222 and had it running good,all the timing wave forms on the 40106 were clean and sharp square waves except for the cap charging pins which were sawtooth but all was good.It was detecting good enough to take to the field so I made the enclosure,pole,handle,put it all together.Got a new lipo battery and charger and all. Turned it on and it was dead as 4 oclock,40106 all pins flat no switching. 7066 working,both regs working fine.What the hell? So I began to doubt my new lipo battery,disconnected it,and reconnected the wall wart power supply I have been using, turned it on and away it went.Checked the 40106 and all the wave forms are distorted,no clean square waves anymore bumps in the tops and in the trace before or after the main pulse.Disconnected wall wart and reconnected battery,turn it on and away it went no problem,on and off again several times keeps on working.The 40106 wave forms are still distorted, This 40106 has got to be failing,Any body got any ideas. I ordered a few trigger chips just to have,I dont trust it anymore.

                          Comment


                          • hello brian

                            seems that we all have to fight with unperfect produced parts time by time
                            if you replace the ic try another from a better brand
                            pay 10cent more and you have no trouble next time

                            since my beginning with detector diy i uses for example only metal film resistors 1% before mounting i measure them if the have to big tolerance i dont use them on detector maybe later for some led projects

                            can help you with your specific problem but soemtimes it was better for me touse a part from another brand

                            regards

                            Comment


                            • hello

                              i changed for sure the 78l05 near icl7660
                              but it gets hot too
                              i measure
                              78l06
                              in to gnd 5v
                              out to gnd 2,8v
                              in to out -1,9v

                              79l05
                              gnd to out 0,8v
                              gnd to in -1,7v
                              in to out 2,5v

                              components are placed like the component overlay
                              only get 0,05v at audio out

                              tested for short circuits and cold solder points

                              i anyone has a idea i would be happy

                              regards bernd

                              Comment


                              • bernd

                                There is one thing you can try, cut the pcb track and isolate the rest of the circuit
                                so there is no load on the two regulators and see what you measure.

                                Comment

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