ADF4351 internal and external voltages.

Discussion about this major DATV Project. See also https://wiki.batc.tv/The_Portsdown_Transmitter
G8PEF
Posts: 87
Joined: Mon Oct 30, 2017 6:42 pm

Re: ADF4351 internal and external voltages.

Post by G8PEF » Fri Mar 09, 2018 9:50 pm

Checked my LO boards this afternoon and was pleased to note that they have 3.3V regs fitted - well they're marked as 3.3V at least.

G4WIM
Posts: 128
Joined: Thu Jan 29, 2015 8:36 pm

Re: ADF4351 internal and external voltages.

Post by G4WIM » Sun Mar 11, 2018 4:53 pm

I've gotten to the point where I won't buy any semiconductors from China for fear of them being counterfeit or faulty.

The straw which broke the camels back were some 2SC2073 devices which were just blanks and had nothing inside the plastic encapsulation at all !

Quite a problem with counterfeit / rejects getting to the supply chain even with Farnell and the like !

GI4DOH
Posts: 7
Joined: Mon Mar 26, 2018 8:44 pm

Re: ADF4351 internal and external voltages.

Post by GI4DOH » Mon Mar 26, 2018 8:55 pm

Business as usual in China by the looks of things - the ADF4351 I have just received from eBay has a 5 volt regulator. Thanks for the warning - and I'll test the replacement when it arrives.
Richard
GI4DOH

G8GKQ
Site Admin
Posts: 974
Joined: Sun Mar 22, 2009 1:21 pm

Re: ADF4351 internal and external voltages.

Post by G8GKQ » Tue Mar 27, 2018 2:30 pm

Hi Richard

Please complain and make a fuss. I did and got a 20% refund in the end. If enough customers complain, the retailers might be able to convince the supplier to take back the faulty stock.

Incidentally, the 5v regulators on my 2 boards were easy to remove and replace - I just melted the solder on all 3 terminals at once and the heatsink came away as I levered their leads up.

Dave

G1BVI
Posts: 107
Joined: Wed Aug 02, 2017 7:32 am

Re: ADF4351 internal and external voltages.

Post by G1BVI » Wed Mar 28, 2018 12:44 pm

At last my ADF4351 is here.
Sadly fitted with a 5v regulator!!!

Mine came from worldtrade100 in China

awaiting there response.
Nick

G1BVI
Posts: 107
Joined: Wed Aug 02, 2017 7:32 am

Re: ADF4351 internal and external voltages.

Post by G1BVI » Wed Mar 28, 2018 1:29 pm

Just ordered 5 regulators from amazon.
arriving Friday.

Fingers crossed they work

Mine also had a 25 Mhz ref Oscilator.

73
Nick

i2NDT
Posts: 40
Joined: Thu Nov 12, 2015 9:26 pm

Re: ADF4351 internal and external voltages.

Post by i2NDT » Wed Mar 28, 2018 2:51 pm

Nick,
which PIC are you going to use: 12F629 or 12LF1552?
you have to modify the original listings to comply with the 25 MHz oscillator.
let me know if you need help in doing it.

Claudio
i2NDT Claudio
Dalmine, Italia

G1BVI
Posts: 107
Joined: Wed Aug 02, 2017 7:32 am

Re: ADF4351 internal and external voltages.

Post by G1BVI » Thu Mar 29, 2018 8:57 am

Thanks Claudio.
not thought that far ahead yet, but if I get into trouble I will most certainly get in touch.

Its so good that Amateurs all around the world help each other.

73

Nick

gi3vaf
Posts: 8
Joined: Thu Apr 05, 2018 6:01 pm

Re: ADF4351 internal and external voltages.

Post by gi3vaf » Thu Apr 05, 2018 6:38 pm

I'm building a Portsdown and glad I read this thread because when I checked the ADF4351 it also has the 5 v regulator. The AMS1117-3.3 isn't available from Farnell etc who only stock the Texas LM1117MP-3.3 That is similar but I have ordered three AMS1117-3.3 from a UK eBay supplier for £1.44! The Farnell LM1117MP-3.3 is only 80 p (plus £4.95 handling and postage) and might probably work. I have to contact the original eBay supplier 'industry_mall' now for a refund...

G8GKQ
Site Admin
Posts: 974
Joined: Sun Mar 22, 2009 1:21 pm

Re: ADF4351 internal and external voltages.

Post by G8GKQ » Thu Apr 05, 2018 8:30 pm

Probably worth checking the eBay AMS1117-3.3s are really what they say are before fitting them to the PCB.

Dave

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