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: 2410
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: 2410
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

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