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Author Topic: Pulse Induction detector build  (Read 36883 times)
nobby
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Wanna be boy band....


« Reply #75 on: November 26, 2015, 06:34:13 PM »

Looks great fairplay Wink
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Cymro
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« Reply #76 on: November 26, 2015, 07:33:26 PM »

Looks great fairplay Wink

Thanks!
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dingdong
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MAD COWS EAT METAL DETECTORISTS !!!🐂🐂🐂🐂🐂🐂


« Reply #77 on: November 26, 2015, 09:51:39 PM »

Nice work !!when is it going into production !!!LOL👍
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Cymro
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« Reply #78 on: November 26, 2015, 10:18:51 PM »

Nice work !!when is it going into production !!!LOL👍

Funny you should mention that . . .  Wink
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Dryland
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Keeper of the Lights


« Reply #79 on: November 28, 2015, 01:45:47 AM »

Are we there yet ? Grin
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Cymro
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« Reply #80 on: November 28, 2015, 08:35:05 AM »

Are we there yet ? Grin

You've been watching 'Wide Awake Club' too much - Timmy Mallet yelling, 'Are we nearly there yet . . .?'

Patience, child . . .  Wink
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Dryland
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« Reply #81 on: November 29, 2015, 02:58:59 AM »

 Grin Grin
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Resurgam
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« Reply #82 on: January 23, 2016, 10:02:58 PM »

Ok, Clive; how is it progressing?
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Cymro
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« Reply #83 on: January 24, 2016, 11:06:41 AM »

I'd nearly forgotten about that . . .

I got everything hooked up, checked, re-checked all the wiring and connections then switched on. Blew the on-board 2A fuse. Replaced the fuse and it did the same again. I only had those two 20mm 2A fuses so sent for more, meantime gutted a couple of larger 2A fuses and soldered the fusible wire across the dead 20mm one.

Still the same so I put the detector aside 'just for now' (allegedly until the new fuses arrived . . . ) Completely lost heart in it even after the new fuses came so haven't touched it since. Got a feeling it's something I've done wrong but need to be in the mood to even feel like trying to figure out what . . .

Bit difficult to fault-find it without a cct diagram - all I have is a connections diagram so dead in the water right now.

So thanks for asking but no good news yet I'm afraid! I'll just have to wait until my Muse decides to make a re-appearance . . .
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dingdong
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MAD COWS EAT METAL DETECTORISTS !!!🐂🐂🐂🐂🐂🐂


« Reply #84 on: January 24, 2016, 07:53:41 PM »

"Nil desperandum" if you can build something that complex, I'm positive that you will sort it out,after all,step back from it,pat yourself on the back,and all of a sudden the solution will come to you, you have done so well mate !!
Looking forward to hearing that the project is completed and exceeds even your own expectations .👏👏👏👏👍
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Resurgam
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« Reply #85 on: January 25, 2016, 01:18:59 AM »

I was well impressed by your initial progress and recon you will soon resolve the present little problem. Perhaps the supplier can point you in the right direction? 
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Resurgam
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« Reply #86 on: January 25, 2016, 09:56:10 AM »

PS...........

                    I wonder if it could be an earthing problem and the power is going directly to earth, rather than into the circuit?
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Cymro
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« Reply #87 on: January 25, 2016, 07:45:20 PM »

Thanks for the encouragement, guys.

I had wondered about a dead short myself - will have to have a good look at it when I get bored the opportunity.

I was doing a few tests to try and narrow the problem down until I ran out of fuses - first I disconnected the coil (still blew the fuse) and then I disconnected the pins from  socket 1 which supply the speaker and reset button. Still blowing the fuse at that point, which was when I ran out of fuses. At least I can discount those . . .

Got myself involved in something technical at the moment but when the bench is clear I'll have another look.
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Detectski
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« Reply #88 on: January 27, 2016, 09:38:13 PM »

Just a thought, if you have access to a current limited power supply (common bench PSU) you could lash this in instead of the fuse and battery. Just set the power supply's current limit to 2A. This would allow you to continue fault finding without blowing more fuses or damaging anything, when you've got the fault sorted reconnect the battery/fuse.

 
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Cymro
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« Reply #89 on: January 28, 2016, 10:16:29 AM »

I do have a bench power supply but it's not current-limited, only voltage-regulated.

I could build a current-limited one but I got out of that when I was into Amateur Radio - I was building test gear to test the test gear, IYSWIM. It's like a never-ending cycle.

But yes, that's a sensible approach.
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