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 :scared: Ok, this is getting absurd, 60KW of subwoofers in a truck:

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Beginners / Re: Sequential tail lights
« Last post by tpowell1830 on Today at 01:46:54 pm »
In australia tail lights are a licensed and regulated component and you will probably get your car ruled unworthy for not using the approved gear from the car shops.

Wow, really, your government forces you to buy parts from exclusive shops? I thought Australia had a small government. First your guns, now telling you what you can put on your cars? I am surprised that Crocodile Dundee would let that happen.  :palm:  :)
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Test Equipment / Re: Equipment Discounts from Saelig
« Last post by tautech on Today at 01:44:22 pm »
Hi;
I've been sitting on the fence for a while now about buying the Siglent SDS1104X-E from Saelig.
I think I'm ready to order mine now, and understand that members of this forum can get a discount.

Thanks

Ultrarunner
PM sent.
4
Beginners / Re: Sequential tail lights
« Last post by Brumby on Today at 01:43:20 pm »
The LM3914, LM3915 and LM3916 ICs each do the sort of job you want - but their sensitivity scale differs (see the video in reply #9).  All three have a "mode" option - where you can have a single dot lit (not what you want) or the bar style (which IS what you want).  A simple switch can change from one to the other

You could use any of these three for playing around but, as mentioned above, the LM3914 is probably going to be the best choice since it will be easier to get a steady progression.

There is also another alternative which a lot of people would try - and that is a microcontroller board - such as an Arduino Uno.  This will require a bit of programming - but don't be at all scared by that ... it is really simple to do something like this light project and there is a lot of expertise available here.


Whether using an LM3814 or an Adruino, the output from these devices will only be enough to light up small LEDs on your breadboard.  You will need higher current drivers to run the serious LEDs you will need for bright lights.  We can deal with that a little further down the track.
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Beginners / Re: Sequential tail lights
« Last post by robjodicarter on Today at 01:35:52 pm »
Yeah, our regulations are allot different. This is going on an off road vehicle only anyway, not a big fan of giving any cop a reason to give me a ticket at all

Sent from my PH-1 using Tapatalk

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Test Equipment / Re: Equipment Discounts from Saelig
« Last post by ultrarunner2018 on Today at 01:34:40 pm »
Hi;
I've been sitting on the fence for a while now about buying the Siglent SDS1104X-E from Saelig.
I think I'm ready to order mine now, and understand that members of this forum can get a discount.

Thanks

Ultrarunner
7
Buy/Sell/Wanted / Re: Wanted budget power supply
« Last post by coromonadalix on Today at 01:31:34 pm »
Pyramid are standard psu, BUT they dont offer very much gadgets like ovp ocp  etc ... i think they all use lm723 ic's, the schematics are in the users manuals, you can find them relatively easy ...


Just the current part is fixed, you can find tons of lm723 ic's designs on google ...

something like this :   https://www.eleccircuit.com/0-70-volt-2-amp-dc-variable-power-supply/

or its brother with an ovp circuit you have to reset to get it going again ???

https://www.eleccircuit.com/power-supply-regulator-0-50v-2a-by-ic-lm723-transistor-2n3055-bd140-a671/



You have some linear DIY pcb with all the parts on Ebay, as low as 5 $ usd ???

https://www.ebay.com/itm/Red-0-30V-2mA-3A-Continuously-Adjustable-DC-Regulated-Power-Supply-DIY-Kit-PCB/201751652278

This one seems very nice, feature packed, schematics available, Strange resemblance with mastech GW Instek psu's ??
https://www.ebay.com/itm/Continuously-Adjustable-DC-DC-Regulated-Power-Supply-DIY-Kit-0-35V-0-5A/173417145714?hash=item286077a572:g:VKMAAOSwHt1bTujt



They are cheap enough with good features, it just need the main input x-former diode bridge and main capacitors
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Beginners / Re: Sequential tail lights
« Last post by Brumby on Today at 01:24:59 pm »
He's not in Australia.  He's in the USA - and their regulations about lights are different.
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Microcontrollers & FPGAs / Re: Nucleo board what does it have ?
« Last post by westfw on Today at 01:24:18 pm »
A lot of board these days will have both Arduino-aligned (permits use of the many "shields" available) and 0.1inch grid-aligned connector (permits use with protoboards, cables, and breadboards) footprints.  Putting long pins into both of them is silly, and defeats the purpose!(the F401 Nucleo I have in front of me has female Arduino connectors inside the double-row 0.1inch grid male connectors, which is ... as it should be...)
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I think at the point that you implement that, it probably won't have any gains over the single-bin DFT  (again correct me if I'm wrong).  I used Goertzel in an FPGA application where I didn't have enough cells for FFT in the past, but I was only interested in magnitude.  It worked quite well.
not sure if Goertzel is optimized single bin DFT for real part, cant differ, but i think even when calculating imaginary part in single-bin DFT (or maybe Goertzel?), the complexity should still near O(n) or O(2n)? still better than O(n.log(n)) if n > 100 or something.

as from the hardware side, there are interesting topology or some sort of impedance divider going on, but its not clear since there are few broken traces so i dont know where the DUT will be connected to. i agree i have to vote this device is more toward "Impendace Analyzer" or "Bode Plotter" as video in the OP, there is no direct S21 measurement let alone S11. so VNA is probably just a marketing hype from Analog Devices or the OP. i look up http://www.analog.com/media/en/technical-documentation/data-sheets/AD5933.pdf the OP circuit front end doesnt resemble anything like the diagrams in the datasheet nor this..


from http://www.analog.com/en/applications/markets/instrumentation-and-measurement-pavilion-home/electronic-test-and-measurement/rf-signal-analyzers-and-vector-network-analyzers.html
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