Page 2 of 4
Re: ADF4351 internal and external voltages.
Posted: Fri Mar 09, 2018 9:50 pm
by G8PEF
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.
Re: ADF4351 internal and external voltages.
Posted: Sun Mar 11, 2018 4:53 pm
by G4WIM
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 !
Re: ADF4351 internal and external voltages.
Posted: Mon Mar 26, 2018 8:55 pm
by GI4DOH
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
Re: ADF4351 internal and external voltages.
Posted: Tue Mar 27, 2018 2:30 pm
by G8GKQ
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
Re: ADF4351 internal and external voltages.
Posted: Wed Mar 28, 2018 12:44 pm
by G1BVI
At last my ADF4351 is here.
Sadly fitted with a 5v regulator!!!
Mine came from worldtrade100 in China
awaiting there response.
Nick
Re: ADF4351 internal and external voltages.
Posted: Wed Mar 28, 2018 1:29 pm
by G1BVI
Just ordered 5 regulators from amazon.
arriving Friday.
Fingers crossed they work
Mine also had a 25 Mhz ref Oscilator.
73
Nick
Re: ADF4351 internal and external voltages.
Posted: Wed Mar 28, 2018 2:51 pm
by i2NDT
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
Re: ADF4351 internal and external voltages.
Posted: Thu Mar 29, 2018 8:57 am
by G1BVI
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
Re: ADF4351 internal and external voltages.
Posted: Thu Apr 05, 2018 6:38 pm
by gi3vaf
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...
Re: ADF4351 internal and external voltages.
Posted: Thu Apr 05, 2018 8:30 pm
by G8GKQ
Probably worth checking the eBay AMS1117-3.3s are really what they say are before fitting them to the PCB.
Dave