One more question I am using a 2N3904 NPN to switch an LED on momentary. The LED is 2.2v / 20ma.
The supply voltage to the Transistor is between 3.8 normal to 5v max with 10ma.
A. What value in-line resistor should I use before the transistor
B. What value resistor should I use between the...
Many thanks for all of your input, I am really starting to feel out of my depth when it comes to RF PCB design is there any recommendations to who I could go to, to over look what I have designed?
Hi Brian
Many thanks for writting back hope your leave went well, sorry to throw all of these questions at you, I did not realise how hard the field of electronics was!
Is there a way of attaching an image to the Forum so that I can show you what I have designed?
Forgot to ask since you mentioned Inductors I have found the following;
RF inductors with a ferrite core encapsulated with ratings from 1 millihenry up and standard axial ferrite bead inductors. Which would you recommend for a 5v RF circuit using 50ma (frequency 433mhz)?
Hope you can advise...
Many thanks Brian for your reply. Well, I am trying to reduce noise from other parts of the circuit sharing the same power supply.
The RF side is a self contained SIL board (incorporating both the RF & Decoder) this then plugs into the main circuit board.
If I use an Inductor in the power...
Please can you tell me if I am correct on both the choice and value of capacitors I am using on a 5v DC power line to an RF circuit.
I have decided to use a Tantalum 10uF for the low frequency, a .1uF Ceramic for the high frequencies and a 0.001uF Ceramic for the very high frequencies. All...
Hi I am pretty new to the field of RF and Remote Control and have been having a problem with reception distance.
Basically I am merging a USB mouse circuit with a 2 channel 433mhz Receiver, utilising the 5v supply from the computer to power both as the current draw is pretty low.
The problem I...
