geophone kit circuit reqest

[steven2]

thankyou audio guru it dose look like a speaker hey, i have a better picutre of the geophone but its in my kodack pictures but when i go to look at it its there but when i go to choose the file with it to post it  i go to look at it first to see if ive got the right one and its not there so i cant find it  anyhow im takeing notes of your exspert  diagnostics so i can improve them better , and im out of printer paper , oh what next , ill have to save the whole thing to d drive

 

[steven2]

heres the latest pictures  i made the printed circuit board for this simple sensitive  geophone like circuit i removed the electro and i used matrix pins for the batteri leads and the coil, i solderd 2 short lenghts of tinned coper wire , about 0.71mm to the matrix pins and then i solderd them to the spade conecters of the microwave oven moter coil, so that it is suspended  above the main board . now this setup makes the coil bounce to shockwaves or vibrations but its still not sensitive enougth as i want it to vibrate to the tap of my finger so ill use something more  better than tinned coper wire to suport the coil , something that has the flexibility of a fin sensitive spring , the red led ill latter change to white and use some kind of relay triggering circuit that can trigger to the flicking of the white led, when i can find one that dose that , near the board you will see some matrix pins these are handy to use and you dont have to remove the board from the project box  with any wires in the way, just to rotate it upside down to resolder any loose wires, in this case the wires are solderd to the matrix pins at the top makeing it easyer to resolder loose wires that may come off. the magnets i use well the metal thing with square magnet on it is from a fishtank air pump and i just stuck 3 powerfull rare earth magnets from a pc hard drive i once dismantled to the square magnet and another round magnet to the bottom of that, that can protrude into the center coil hole easy

View attachment 38831

 

[steven2]

View attachment 38832

 

[steven2]

while im here dose anyone have a sensitive light activated relay circuit that triggers the relay when the on light flickers  at any number of times . this ones a hard one so i wonder if anyone has such a circuit . otherwise its back to data crunching and serching

 

[steven2]

still conducting tests of this circuit, but i decided to intergrate the audio amp to it  again and try something else and got a more sensitive  response of the circuit with the few powerfull rare earth magnets from further away from the coil  but even though the wieght of all the rare earth magnets may be a little bit hevey , ill just have to work on the coil by putting sensitive  springs in so it will bounce more easyer than the magnets would to vibrations

 

[steven2]

oh i forgot to mention, the 741 inverter circuit in this allso woeks without a battery  due to the induction of voltage into the coil from the slight movement of the magnet , the audio section has a battery to give audio reaction, i can see some good aplications here

 

[audioguru2]

the 741 inverter circuit in this also works without a battery

It doesn't work with its inputs at the negative supply voltage, and it has many other problems. So the 741 works like a piece of wire.

The LM386 amp has a gain of 200, which is plenty. Try the coil connected like this:View attachment 38880

 

[steven2]

thankyou audio guru the electro in the 741 circuit i remved before with your recamendations and the 1k to  so ill try the latest .by leaveing out the 104 monoblock

 

[audioguru2]

Hi Steven,
Here is the way your 741 inverting opamp should have been connected:

View attachment 38888

 

[steven2]

thankyou audio guru ill try that one to, all though there are more 741 circuits on the net to and the one i used before was one of them so i welcome the extra. oh by the way i tried that circuit you said to try and its not very good it dont work, the powerfull rare earth magnets have to be sitting on top of the coil and moved, like brushing it to get any reaction, from the audio amp , however the latest way i have it set up its so sensitive that i dont have to swing the magnet, i can raise it and lower it and get an effect in fact at nearly 10mm is pritty great range  thats with the magnet away from the coil , and with the 1k and 10uf  removed from the 741 circuit, and i taped to the led leg  before the 10 ohms resister  and i conected the other coil input to somewhere else , now  my nine volts batteries aint full charge so the second was just a helper and when i removed the 9 volts battery from the preamp section it still worked , by just the induced voltage into the coil from the slightest movement of the magnet  and with the battery back in its more responsive , and even though it aint audio signal i think, to be boosted  at least im getting some form of sound from the amp section. ive saved that latest you posted so il be trying it to

 

[audioguru2]

with the 1k and 10uf

 

[steven2]

thankyou audio guru ,

 

[steven2]

audio guru ive made the latest changes with your corections and it seems to be ok ill post more replies when i get fresh batteries