I need a working NRF24L01+ + RFX2401C circuit diagram

RE: I need a working NRF24L01+ + RFX2401C circuit diagram

bajiehok — Fri, 04 Sep 2020 12:33:19 GMT

Hello! Сan you tell me, what type of balun did you used? Is it 2450BM14A0002 ?

Thanks!

RE: I need a working NRF24L01+ + RFX2401C circuit diagram

Kaja — Mon, 05 Aug 2019 08:16:06 GMT

Hi,

yes you can, you might have to tune some of the values to match your custom design, to get desired output power and low enough harmonics, but these components is a good start point, and should work for designs which follows the reference design layout.

Best regards,
Kaja

RE: I need a working NRF24L01+ + RFX2401C circuit diagram

KAMEN — Fri, 02 Aug 2019 14:26:22 GMT

everything works just related to my original question if i eliminate the balun between the rfx2401c and nrf24l01+ can i use the same values for the components in the black square? (practically the reference design)

RE: I need a working NRF24L01+ + RFX2401C circuit diagram

Kaja — Wed, 31 Jul 2019 13:34:29 GMT

Hi,

so the reference design, need to be followed, so your understanding in the first reply was correct.

Do you still have something not working?

Best regards,
Kaja

RE: I need a working NRF24L01+ + RFX2401C circuit diagram

KAMEN — Sat, 27 Jul 2019 18:40:50 GMT

also seen the recommendation of avoiding the centerpad connection to ground but it was too late. it works ok tho, may be in the next build i will avoid it.

RE: I need a working NRF24L01+ + RFX2401C circuit diagram

KAMEN — Sat, 27 Jul 2019 18:37:43 GMT

also from my simple tests i can tell that ready bought quality nrf24l01+ modules which are available in aliexpress(with genuine nrf chips) gives me exactly the same results in signal strenght. But they mostly use u.fl connector which dodgy and fragile. with custom made you are free to use any connector in my case i wont use anything other than SMA.

RE: I need a working NRF24L01+ + RFX2401C circuit diagram

fmwa apk anti-ban — Sat, 27 Jul 2019 18:32:46 GMT

thanks for the share and it will work it for me.

fmwa apk anti-ban

RE: I need a working NRF24L01+ + RFX2401C circuit diagram

KAMEN — Sat, 27 Jul 2019 14:37:05 GMT

reflowing the board made it work also second module worked as well so i guess there was some physical connection issue although visibly i couldnt spot a dodgy connection.

but im still interested in making another one without balun and a band pass filter. balun is tiny hard to see its tiny connections with bare eyes :)

RE: I need a working NRF24L01+ + RFX2401C schematic

KAMEN — Fri, 26 Jul 2019 17:00:01 GMT

i went for hunting around the web for some ideas. so this is the reference design and particularly interested with ANT1 ANT2 and VDDPA pin connections. to my understand regardless of RFX2401C i need to populate L1,L2,L3, C3,4,5 and 6.

then i found this design which im not sure of its source. but the first black box seems like the same as the reference design of nrf24l01+ with addition of TXEN and RXEN pins through 1k series resistor but ANT harmonic filtering is missing.

edit:also just noticed L1,2 and 3 values are different from the reference nrf24l01 design..

looking at the RFX2401C datasheet in the red box that i marked is the LC filter and C3,4,5,6,7 as well as L1,2 must be populated.

do these schematics looks ok? i guess if i add the last LC filter part to second picture where ANT is marked would be ok?