Beachmaster Files

[MartinB]

if you order at jlcpcb be smart and take the smd paste stencil option, will save a lot of work

Good advice. Thank you

[Qiaozhi]

I ordered some PCBs from JLCPCB on the 9th March (see post #36), and have literally just received a DHL delivery on the 16th March.
That's only 7 days from sending the Gerber files and receiving the final product delivered to my door in the UK.

[bernte_one]

Got a little surprise today.

[Olly]

Got a little surprise today.

Don't they look pretty in Purple ?

[bernte_one]

yes really nice to look, hope i can start assembling at weeking

[amindevil]

thanks a lot Olly for sharing this project. i still have problem with finding some of the smd parts but nothing serious. and i like it how you respectfully answer questions

[Olly]

thanks a lot Olly for sharing this project. i still have problem with finding some of the smd parts but nothing serious. and i like it how you respectfully answer questions

Hope you enjoy building it. What parts are you having problems finding?

[hamedtaran]

Thanks to the designer for this nice design. Has anyone made this metal detector yet? Is there a test video?

[Olly]

I haven't made a test video I'm afraid, but 'Surfdetector' has made a very nice series of videos on his YouTube channel about constructing and testing it.
https://www.youtube.com/watch?v=mUWko4utwYc

[MartyJ1963]

Nice to see you back Graham! Regards, Marty.

[hamedtaran]

I haven't made a test video I'm afraid, but 'Surfdetector' has made a very nice series of videos on his YouTube channel about constructing and testing it.
https://www.youtube.com/watch?v=mUWko4utwYc

Thankful. I've seen those videos before, but I haven't seen a test video of the device working. Is this circuit better than Polones circuit? I've already built polones and tl12000

[Olly]

No test video I'm afraid. As for whether it's better or worse than the Polones and/or ti12000, I really can't say as I'm not familiar with those.
I would say that it works as expected for a mono-coil, analogue, pulse induction detector. I like it, but then I'm biased

[hamedtaran]

No test video I'm afraid. As for whether it's better or worse than the Polones and/or ti12000, I really can't say as I'm not familiar with those.
I would say that it works as expected for a mono-coil, analogue, pulse induction detector. I like it, but then I'm biased

I don't understand what you mean by afraid, anyway i will make it soon

[nickel_n]

Hope you enjoy building it. What parts are you having problems finding?

the 2SD1781A is elusive.
20 weeds eta on Digi-Key its been like that for some time

[Olly]

the 2SD1781A is elusive.
20 weeds eta on Digi-Key its been like that for some time

Hmm, that specific part is made by Panjit. I chose it because it has quite a high gain (hfe = 500 typical) and can handle a bit more pwer than most little SOT transistors.
I haven't checked for substitutes but any NPN transistor with a reasonably high gain (say hfe above 300) and able to handle reasonable power (at least 1/2 watt) should be fine if using the audio with headphones.