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I decided to create a simple 2 way radio transmitter as I am very interested in ...
michaelkd

michaelkd

I decided to create a simple 2 way radio transmitter as I am very interested in learning more about communication protocols and radio technology. I found it very helpful whenever the parts I needed were already in the parts library, however, I found the component creator very unintuitive coming from Fusion 360. I really liked playing around with Copilot and the extent of what it knew and could solve really surprised me. I found the layout rules a little confusing at first, but once I started to understand it I appreciated being able to edit all of the properties in one place. I really like how simple the webapp is to run as well!
2y
2
please explain what Q2 does.
michaelkd

michaelkd

@copilot please explain what Q2 does.
2y

copilot

The Q2 designator represents a 2N3904 NPN Bipolar Junction Transistor (BJT). In this walkie-talkie circuit, Q2 is functioning as a voltage amplifier. The electrical signal from the microphone (MK1) is quite small and not sufficient to drive the radio transmitter (U1).
This is where Q2 comes in: it takes the small input voltage from the microphone (MK1), applied between its base (B) and emitter (E), amplifies it and reproduces it across its collector (C) and emitter (E). This amplified signal is then ready to be input into the radio transmitter.
The Q2 base-emitter junction is forward-biased by capacitor C4 and R4, allowing AC signals to pass through while blocking DC. The collector-emitter junction is reverse-biased by the power supply (+9V). The amplification level is largely determined by the values of R3 and R4.
In short, Q2 is used as the amplifier part of the walkie-talkie to enhance the audio signal coming from the microphone (MK1) before being sent to the NRF24L01 transceiver for transmission.
2y
4
U1
J1
MK1
C1
Capacitance
100uF
+9V
U3
C2
Capacitance
100uF
C6
Capacitance
100uF
R1
Resistance
10KΩ
C5
Capacitance
0.1uF
IRQ
R2
Resistance
10KΩ
R4
Resistance
100KΩ
C4
Capacitance
0.1uF
R3
Resistance
10KΩ
Q2
SPK1
U2
C3
Capacitance
100nF
IRQ
SW1

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Documents

    Documents are markdown text files which describe project goals, capture details, or even simulation outputs.

    Assets

    svg

    Radio-svg

    radio-svgrepo-comDefault

    Walkie-Talkie circuit

    Walkie-Talkie circuit thumbnail
    A simple walkie-talkie circuit running off an Arduino Nano. Utilizes a BJT to amplify the microphone voltage and transmits the radio signal through a nRF24L01 series Transceiver.

    Properties

    Properties describe core aspects of the project.

    Pricing & Availability

    Distributor

    Qty 1

    Arrow

    $3.85–$4.58

    Digi-Key

    $6.26–$11.48

    LCSC

    $8.50–$11.71

    Mouser

    $4.61–$4.74

    Verical

    $0.59–$0.92

    Controls