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hi，The master! In all PI detector circuits, large electrolytic capacitors are used in the power supply part, which increases the volume of the circuit board. We have high current battery power supply, do we necessarily need large capacitors
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The 1000uF electrolytic with low ESR is required for C27 as this offloads the heavy current transients from the battery -12V supply.Originally posted by jeep6789 View Post
The value of 1000uF was chosen such that with a 100uSec wide pulse and a flat top current of 2A we'll drop a maximum of 200mV during a TX pulse.
This is according to the formula "I/C = dV/dT"
The bulk decoupling capacitors C13 and C16 are there to compensate for the lead inductance of the wires which run from the battery to the PCB.
If you use thick wires and have the batteries very close to the board, then you can most likely get away with having smaller capacitors.
If on the other hand, you mount your batteries under the cuff as I do and have relatively long wires to the PCB in the control box then the 1000uF caps are required.Comment
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OK, design complete and PCB layout done !
Going to spend a few days reviewing and checking that all is as it should be before I have the boards made.
Also going to order the parts I need and in so doing ensure that they're all available.
I'll update again once I start testing...Comment
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When do you start writing programs? What kind of monitor do you have?Comment
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I've actually put together quite a lot of the PIO assembler code for pulse generation, audio and ADC SPI with DMA already.Originally posted by jeep6789 View Post
The main software still needs quite a bit on the design side before any 'C' coding can begin though.
I mostly work on a Mac with 32" screen.Comment
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Wow Graham! You've been really busy. Totally looking forward to the new PCB Layout! I can see Alec being able to cure his ''Next new project'' building 'Itch' pretty soon!,,Lol. Wonderful news Graham, regards, Marty.Comment
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Thanks Marty, hoping this will be a nice baseline to experiment with.Originally posted by MartyJ1963 View Post
Still some way to go though.Comment
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Why no one directly collects the signal of the coil with more than 20 ADCs, so it doesn't need to be enlarged, the circuit will become very simple.Comment
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Looking forward to it Graham, it's totally remarkable and very considerate of you contributing to the forum as you have done and I'm sure, like other members, that everyone appreciates your hard work, valuable time and kindness. I'm amazed at your skills and totally enviious,,,in a good way! Lol. Regards, MartyComment
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That's very kind of you thanks Marty.Originally posted by MartyJ1963 View Post
I'm retired now after many years in the Avionics, Aerospace and Audio industries and need some little projects to keep my grey cells working so it's an absolute pleasure to be able contribute to this forum with all its knowledgeable and helpful people.
Kind regards, GrahamComment
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Looks promising thanks for the efforts Olly.
I'm following the project.Comment
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OK, parts ordered and JLCPCB busy making the 4-layer PCB. Final board size 85mm x 55mm.
Time to work on the software design...Comment
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While waiting for the boards to arrive thought I'd resurrect an audio toolkit that I wrote a while back to run on a high quality sound card.
Should be perfect for measuring the noise output from the preamp.
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