Beachmaster Files

[nickel_n]

Thanks Olly

[surfdetector]

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

Mouser has them in stock.

[hamedtaran]

Hello Olly, I hope you are well. I have a few questions, if the use of those large potentiometers(POTs) is to adjust the pulse width and frequency, etc., then how are they different from small multiturns(RVs)? Second question: What is the best part instead of 2sd? Because I could not buy it
I apologize for my bad English

[surfdetector]

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

The Beachmaster is much more stable than the Polones in my experience.

[surfdetector]

Hello Olly, I hope you are well. I have a few questions, if the use of those large potentiometers(POTs) is to adjust the pulse width and frequency, etc., then how are they different from small multiturns(RVs)? Second question: What is the best part instead of 2sd? Because I could not buy it
I apologize for my bad English

The PDF describes the functions of the Pots and the RVs. Each one is explained.

[nickel_n]

The build document at Beachmaster_1.1.zip
paragraph 3.8 Sample Gates and Integrators

states at 3.8.1 the parts that need to be installed.
there is NO reference to R18 10k, and C9 470nf.
they are on the schematic and pcb.
i think it's a typo and it should be corrected

[Olly]

The build document at Beachmaster_1.1.zip
paragraph 3.8 Sample Gates and Integrators

states at 3.8.1 the parts that need to be installed.
there is NO reference to R18 10k, and C9 470nf.
they are on the schematic and pcb.
i think it's a typo and it should be corrected

Thanks for pointing this out, these components are described under the preamplifier section 2.4 but as you have correctly indicated I have omitted to include them in the build description. I'll correct this in the next version of the file.

Regards

[nickel_n]

thank you Olly

[hamedtaran]

Can we connect a one-meter coil to this circuit?

[surfdetector]

Can we connect a one-meter coil to this circuit?

I think that you should build the Delta Pulse.

[hamedtaran]

I think that you should build the Delta Pulse.

Does it mean that it is not possible to use a large coil in this circuit? Isn't this pi type circuit? I have built most of the pi circuits before, I want to try this circuit with a large coil, is this not possible at all?

[surfdetector]

Does it mean that it is not possible to use a large coil in this circuit? Isn't this pi type circuit? I have built most of the pi circuits before, I want to try this circuit with a large coil, is this not possible at all?

Yes it is possible. Please build it.

[Olly]

Does it mean that it is not possible to use a large coil in this circuit? Isn't this pi type circuit? I have built most of the pi circuits before, I want to try this circuit with a large coil, is this not possible at all?

The Beachmaster should work fine with any coil size. I've only tested it with 10" and 8" coils but there's no reason that it shouldn't work with a one-meter coil.
I'd certainly be interested in your results if you choose to try it.

Regards

[hamedtaran]

The Beachmaster should work fine with any coil size. I've only tested it with 10" and 8" coils but there's no reason that it shouldn't work with a one-meter coil.
I'd certainly be interested in your results if you choose to try it.

Regards

Thank you for your reply, I ordered the pcbs today, I will start making it soon.

[hamedtaran]

The Beachmaster should work fine with any coil size. I've only tested it with 10" and 8" coils but there's no reason that it shouldn't work with a one-meter coil.
I'd certainly be interested in your results if you choose to try it.

Regards

Hello, good time, my pcb order arrived from China

please design this circuit to be able to increase the pulse width up to 300 microseconds, because as far as I know, using a large coil requires more pulse width. How do you think pcbs quality?