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Offline ImpulseTopic starter
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« Reply #20 on: February 14, 2016, 12:11:46 pm »
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hey guys ok so i have had a look and i have managed to get it back to where i was, i have found a better speaker so now i get a tone if i turn the pot all the way up i get a whine which i would expect. When i connect any thing to the coil side it shorts out and the mosfet goes mental. i took the 2222 off and tested it with my multi meter and it is fine what else could it be?

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« Reply #21 on: February 14, 2016, 01:17:32 pm »
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  Bad Mosfet, Coil Ohms,  Mosfet Drive ON !

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« Reply #22 on: February 14, 2016, 01:42:55 pm »
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Try mosfet drive  Cool

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« Reply #23 on: February 15, 2016, 03:00:29 pm »
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Hey guys my coil is 10" Dia 20 turns magnet wire 0.5mm 1.7 ohms, covered in foil for a temp shield, when i turn on the power i do not get a beep i only get the hum if i turn the pot up too much (good?) and i can wave a large spoon ( first thing to hand ) and if i play with the pots i can get a slight pick up tone but anything smaller and it will not pick it up. i have ordered another kit and will try again its like the bottem w203 pot does not work as it should ?


so this is where i am now guys i have ordered a new one :Smiley once i get paid i will order an oscilloscope (cheep one)

and im going to check all the bits to make sure they are correct  Coffee

i going to keep on with this board as it seems to function but not very well atm


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« Reply #24 on: February 15, 2016, 04:47:04 pm »
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You give up up too easy.    Look again.

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« Reply #25 on: February 15, 2016, 04:57:34 pm »
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na i havent given up i am still sat here with it in front of me trying to get it to work, the over heating issue has gone but now with the coil on i cannot get it to pick up anything smaller than a pair of scissors or a large spoon, i will not give up thats to easy i just need a bit of help from you kind folk that are the experts in this field  Wise

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« Reply #26 on: February 15, 2016, 05:09:20 pm »
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Us English never give up just die trying  Grin

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« Reply #27 on: February 15, 2016, 08:39:10 pm »
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Experts.   Drip Under Pressure ?   What kind of coil are you using ?   Just twist up a simple coil.

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« Reply #28 on: February 16, 2016, 03:27:18 pm »
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hey guys i have built another board and have managed to get the coil to pick up a gold chain next to the coil i have set pin 6 to 0V again and i have tried to get the tone to change but nothing happens, i have noticed a strange thing the coil hums not the speaker (dont worry i havent connected them the wrong way around) unless i wave a piece of metal infront of it (the coil) and the mosfet gets warmer than i would like any ideas?

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« Reply #29 on: February 17, 2016, 08:32:21 am »
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   The coil buzzing is it being Pulsed.   Sound like your audio section or before is not working.   I would Check power to all chips starting at the first Amp.

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