Power connection question

Discuss KerberosSDR - 4x Coherent RTL-SDR
zs6iix
Posts: 4
Joined: Thu Nov 07, 2019 11:55 am

Re: Power connection question

Post by zs6iix » Thu Nov 07, 2019 12:05 pm

Good day all
After receiving my KerberosSDR about a month ago i only powered it up this morning.Using a Desktop variable psu set to 5v and 3 amps all went well.
I was busy setting up the phone and suddenly i lost coms with the Kerberos

I checked the psu and saw that it was in over current protect.
I did check between + and - and it is short circuit did removed c4 and c47 they seems to be fine.

If somebody can forward me the circuit diagram for the power circuit i can get my Kerberossdr running again

Regards Henry de ZS6IIX

zs6iix
Posts: 4
Joined: Thu Nov 07, 2019 11:55 am

Re: Power connection question

Post by zs6iix » Thu Nov 07, 2019 1:00 pm

Hi Again
Did some testing and removed U2 and short is gone
Anybody knows the value of U2

ZS6IIX

rtlsdrblog
Site Admin
Posts: 2688
Joined: Mon Nov 19, 2012 11:54 pm

Re: Power connection question

Post by rtlsdrblog » Fri Nov 08, 2019 11:37 pm

U2 is this part https://lcsc.com/product-detail/DC-DC-C ... 82161.html

It's a voltage regulator. Not sure why it would have shorted out. Was the voltage definitely 5V? This part has a limit of 5.5V.

zs6iix
Posts: 4
Joined: Thu Nov 07, 2019 11:55 am

Re: Power connection question

Post by zs6iix » Mon Nov 11, 2019 7:19 am

Thank you for the reply

Now to get one in South Africa is going to be a big challenge

I see min order is 5 but post cost is going to be close to $50
Yes to power was 5.1v on the psu .

maybe just a bad one .

rtlsdrblog
Site Admin
Posts: 2688
Joined: Mon Nov 19, 2012 11:54 pm

Re: Power connection question

Post by rtlsdrblog » Tue Nov 12, 2019 11:26 am

zs6iix wrote:
Mon Nov 11, 2019 7:19 am
Thank you for the reply

Now to get one in South Africa is going to be a big challenge

I see min order is 5 but post cost is going to be close to $50
Yes to power was 5.1v on the psu .

maybe just a bad one .
If you think it was through no fault of your own and it was bad hardware, contact us at [email protected] and [email protected], and we'll see what we can do.

zs6iix
Posts: 4
Joined: Thu Nov 07, 2019 11:55 am

Re: Power connection question

Post by zs6iix » Wed Nov 13, 2019 10:53 am

Good day
Thank you
I was able to locate replacement part from RS-Components and it will be on my desk next week
AP3407AKTR-G1
1.2A 1.4MHz DC-DC Buck Converter SOT23-5

KD7CAO
Posts: 16
Joined: Thu Feb 20, 2020 3:27 am

Re: Power connection question

Post by KD7CAO » Sat May 23, 2020 11:35 pm

Sorry to resurrect an older thread.

Is it possible to supply power anywhere else than the micro-USB port on the v2? I am finding this connector to be finicky and trying to get my system setup for mobile use. Twice now discovered my issue was with the cable backing out. Short of hot-gluing it in place I would like to just give it supply elsewhere.

I am currently using a Pi Power Hat for the Pi4B4G so that I can avoid it's USB power port. I pulled power off the powerhat and supplied it to KSDR but, would like to do away with the micro-USB port.

Maginux
Posts: 17
Joined: Sun Apr 21, 2019 9:27 am

Re: Power connection question

Post by Maginux » Sun Jun 14, 2020 12:00 pm

Concerning myself I decided to create a dedicated electrical supply entirely. 12V power supply (AC) and four USB-A outputs (5v / 2A per connector);

Which gives this:
One for my cell phone - One for the Raspberry Pi
One for Kerberos - One last "just in case".
In the event of a power failure, a 7.4V LiPo battery can take over automatically during the lapse of time to restart the car engine.

I hope this will be enough in terms of intensity.

rtlsdrblog
Site Admin
Posts: 2688
Joined: Mon Nov 19, 2012 11:54 pm

Re: Power connection question

Post by rtlsdrblog » Tue Jun 23, 2020 8:48 am

KD7CAO wrote:
Sat May 23, 2020 11:35 pm
Sorry to resurrect an older thread.

Is it possible to supply power anywhere else than the micro-USB port on the v2? I am finding this connector to be finicky and trying to get my system setup for mobile use. Twice now discovered my issue was with the cable backing out. Short of hot-gluing it in place I would like to just give it supply elsewhere.

I am currently using a Pi Power Hat for the Pi4B4G so that I can avoid it's USB power port. I pulled power off the powerhat and supplied it to KSDR but, would like to do away with the micro-USB port.
The header on the bottom has 5V/GND pins that match the Pi's headers. You could try to power it that way if you built a custom header board.

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