Chat

Welcome to Flux

Treat Flux like your intern. Tell it what you'd like to build and it'll get to work. You can also ask it questions, brainstorm ideas, and teach it your preferences. Learn More

Explain project

Write a project description

Find schematic issues

Create a test plan

Simulate a circuit

Prepare for Manufacturing

Component Selection Workflow

New Subsystem Wizard

create a detailed step by step plan table for this project to verify its functio...

cupex

@copilot create a detailed step by step plan table for this project to verify its functionality.

copilot

Below is a detailed step-by-step plan in table format to verify the functionality of this FM transmitter project. Each step includes objectives, actions required, expected results, and troubleshooting tips.

Table

Step	Objective	Actions Required	Expected Result	Troubleshooting Tips and Notes
1	Prepare and Inspect Components	Gather all components listed in the project and visually inspect them for damage or defects.	Components are in good condition and ready for use.	Replace any damaged components.
2	Assemble the Circuit	Assemble the circuit according to the provided schematic. Use a breadboard for initial testing if possible.	Circuit assembled with all components in correct places.	Double-check connections with schematic.
3	Power the Circuit	Connect the VCC and GND to the power supply (3.3V).	Circuit powers on without components overheating.	Ensure correct voltage and polarity.
4	Check Voltage Regulator (U1) Output	Measure the output voltage at $U1: VOUT$ using a multimeter.	Output voltage should be 3.3V.	If not 3.3V, check connections to $U1$ .
5	Inspect Crystal Oscillator Stability	Verify that the frequency output remains stable at 90 MHz.	Frequency is 90 MHz without drift.	Use a frequency counter for measurement.
6	Validate Microphone Input	Connect a microphone to $J1$ and test if it outputs audio signals correctly.	Audible signals should be present at $U2: OUT+/-$ .	Check microphone connections if silence.
7	Check Signal Modulation	Measure the modulated signal at $U2: OUT+$ using an oscilloscope.	Signal should be frequency-modulated according to input.	Adjust $VR1$ if modulation is weak.
8	Test Transmission Range	Connect $ANT1$ and verify the signal can be received at a distance up to 50 meters.	Clear reception at specified range.	Check antenna placement and connections.
9	Power Down and Inspect	Disconnect power and inspect all components for signs of stress or damage.	No overheat or burn marks on components.	If components are damaged, revisit power ratings.

This table should guide you through the process of verifying the functionality of your FM transmitter project. Let me know if you need further clarification or additional details on any step!

Someone is typing...

create a detailed step by step plan table for U2 to verify its functionality.

milanpopovic

@copilot lets test it

copilot

Great! Let's ensure that your FM transmitter circuit is connected properly before we proceed with testing. Here are the connections based on the components and nets you've described:

Connections: U1: AP2210N-3.3TRG1 (Voltage Regulator)

VIN (1) -> Connect $U1:1$ to $VCC PAD:1$ .
GND (2) -> Connect $U1:2$ to $GNDPAD:1$ and $C1:2$ , GND.
VOUT (3) -> Connect $U1:3$ to $+3V3:1$ .

U2: MAX2606EUT+T (FM Transmitter IC)

IND (1) -> Connect $U2:1$ to $L1:2$ .
GND (2) -> Connect $U2:2$ to $L1:1$ , $C4:2$ , and GND.
TUNE (3) -> Connect $U2:3$ to $C4:1$ and $C3:2$ .
OUT- (4) -> Connect $U2:4$ to $R1:2$ .
VCC (5) -> Connect $U2:5$ to $R1:1$ , $+3V3:1$ .
OUT+ (6) -> Connect $U2:6$ to $C5:2$ , $R1:1$ .

Components and Other Connections

L1:390nH (Inductor)
- Connect $L1:1$ to $U2:2$ .
- Connect $L1:2$ to $U2:1$ .
ANT1
- Connect $ANT1:1$ to $C5:1$ .
R4: 500Ω
- Connect $R4:1$ to $+3V3:1$ .
- Connect $R4:2$ to $C3:1$ and $J1:2$ .
VR1
- Not connected as per the provided details.

Capacitors

C1: 2.2uF
- Connect $C1:1$ to $U1:3$ .
- Connect $C1:2$ to $GNDPAD:1$ .
C3: 2.2uF
- Connect $C3:1$ to $R4:2$ , $J1:2$ .
- Connect $C3:2$ to $U2:3$ .
C4: 1nF
- Connect $C4:1$ to $U2:3$ .
- Connect $C4:2$ to $U2:2$ .
C5: 100pF
- Connect $C5:1$ to $ANT1:1$ .
- Connect $C5:2$ to $U2:6$ , $R1:1$ .

Power

+3V3
- Connect $+3V3$ to the related components as indicated.

Microphone

J1:Microphone
- Connect $J1:1$ to GND.
- Connect $J1:2$ to $R4:2$ , $C3:1$ .

Testing Steps:

Power Supply: Ensure you have a DC supply providing a clean +3.3V to the circuit. You can use a DC lab power supply for stable power.
Check Connections: Verify all connections using a multimeter to ensure correct continuity and correct polarity for components.
Oscilloscope: Use an oscilloscope to check the output frequency at the output of the FM transmitter. You should see the carrier frequency at around 90MHz.
Antenna: Attach a suitable antenna to the antenna (ANT1) pin.
Audio Input: Provide an audio input through the microphone (J1).
Testing Range: Tune an FM receiver to 90MHz and check for the transmitted signal.

Let me know if you want to move forward with any specific tests or adjustments.

milanpopovic

@copilot create a detailed step by step plan table for U2 to verify its functionality.

copilot

Sure, I can provide a detailed step-by-step plan to verify the functionality of U2, which is the MAX2606EUT+T FM Transmitter IC.

Here's a verification plan table:

Table

Step	Description	Expected Result	Connection Details
1	Visual Inspection	Inspect the IC for any visible defects or incorrect placement on the PCB.	The IC should be correctly positioned and soldered with no visible defects.
2	Power Supply Verification	Verify that the IC receives the correct supply voltage.	U2:VCC should be at 3.3V relative to GND.
3	Inductance Verification	Ensure that the required inductor is correctly connected.	U2:IND should be connected to L1:P2.
4	Tuning Verification	Verify the tuning control voltage.	Connect the tuning network to U2:TUNE.
5	Output Verification	Verify the output signal from the IC.	Measure the signal at U2:OUT+ and U2:OUT-.
6	Audio Input Verification	Check if the audio input is being properly modulated.	Inject an audio signal at J1:OUT. The output frequency should vary with the audio input.
7	Antenna Verification	Ensure the antenna is properly connected to maximize transmission range.	ANT1 should be correctly attached and impedance matched.
8	Functional Test	Perform a complete functional test by supplying power and an audio signal, then verifying FM transmission.	Tune a receiver to the designated frequency (90MHz). The audio should be clear without significant distortion or noise.

Detailed Explanation of Connections

Visual Inspection
- Just visually inspect U2 for any incorrect soldering, possible shorts, or component mismatches on the PCB.
Power Supply Verification
- Connect U1:VOUT to +3V3 (+3V3):+3V3.
- Connect U1:VIN to VCC PAD.
- Measure to confirm U2:VCC is 3.3V relative to GND.
Inductance Verification
- Connect L1:P1 to U2: $IND$ .
- Verify using an LCR meter that L1 is 390nH.
Tuning Verification
- Make sure the tuning components (such as VR1) are connected to U2:TUNE.
Output Verification
- Measure at U2:OUT+ and U2: $OUT-$ . Waveform should be a stable FM signal.
Audio Input Verification
- Inject audio to J1 and look for frequency modulation in the output signal.
Antenna Verification
- Connect C5:P1 to ANT1.
- Ensure the antenna is matched to a 50Ω impedance.
Functional Test
- Power up the circuit, inject an audio source, and use an FM receiver to check reception quality. Verify that the audio is clear and the transmission coverage is as expected.

This plan should help you systematically verify the functionality of U2. Let me know if you need further assistance with any of these steps!

Someone is typing...

create a detailed step by step plan table for U2 to verify its functionality.

milanpopovic

@copilot create a detailed step by step plan table for U2 to verify its functionality.

copilot

Below is a detailed step-by-step plan to verify the functionality of U2 (MAX2606EUT+T). This process includes ensuring the component is correctly connected and that it is functioning as expected.

Table

Step	Action	Details	Expected Result
1	Visual Inspection	Ensure no visible damage on U2. Confirm correct orientation and undamaged pins.	U2 is intact and properly oriented.
2	Check Power Supply Connections	Verify connections: Connect U2-VCC to Net-U2-VCC. Connect U2-GND to Net-U2-GND.	Proper 3.3V supply and GND connected to U2.
3	Verify Voltage Levels	Use a multimeter to measure voltage at U2-VCC and U2-GND.	Voltage at U2-VCC should be 3.3V ± 5%.
4	Check Output Connections	Verify net connections: Connect U2-OUT to Net-C5-P2. Connect U2-OUT- to Net-R1-P2.	Ensure proper connections to output nets.
5	Verify Inductor Connection	Verify connection: Connect U2-IND to Net-L1-P2.	Inductor connected correctly.
6	Verify Tune Input Connection	Verify connection: Connect U2-TUNE to Net-C4-P1.	Tuning input connected to correct net.
7	Check Overall Functionality	Power the circuit and use an oscilloscope to measure the output frequency at U2-OUT and U2-OUT- relative to GND.	Oscilloscope shows a frequency close to 90MHz.
8	Check Signal Quality	Assess the signal on the oscilloscope for stability and expected waveform shape.	A stable sine wave at the expected frequency.
9	Test with Antenna	Connect an antenna to ANT1-1 and monitor the broadcast range and signal quality.	Broadcast range up to 50 meters with clear signal quality.

Note:

Always ensure safe handling of the circuit components, especially during the power-on stages.
Make sure the power supply is stable and within the component's tolerance range.

Completing these steps will verify that U2 is functioning correctly in your FM transmitter circuit. Let me know if you need further assistance on any specific steps!

Someone is typing...

New Comment

Someone is typing...

GND

Capacitance

2.2uF

ANT1

Capacitance

100pF

Reviews

Ground
A common return path for electric current. Commonly known as ground.
jharwinbarrozo
20.5M
Net Portal
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
jharwinbarrozo
43.0M
Power Net Portal
Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
jharwinbarrozo
11.4M
Generic Resistor
A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Capacitor
A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibrary
jharwinbarrozo
1.5M
Generic Inductor
A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
jharwinbarrozo
15.8k
Terminal
An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
natarius
RMCF0805JT47K0
47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film #forLedBlink
jharwinbarrozo
1.2M
875105359001
10uF Capacitor Aluminum Polymer 20% 16V SMD 5x5.3mm #forLedBlink #commonpartslibrary #capacitor #aluminumpolymer #radialcan
jharwinbarrozo
1.2M
CTL1206FYW1T
Yellow 595nm LED Indication - Discrete 1.7V 1206 (3216 Metric) #forLedBlink
jharwinbarrozo
1.1M

Project Name

FM_Transmitter

Description

This is one of the simplest FM transmitters that can be built. It does not require any tuning, and transmit frequency is crystal locked to 90MHz. It eliminates frequency drift common to LC-based FM transmitters. This design is best suited for broadcasting voice or music up to a distance of fifty metres depending on the antenna used.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor	Qty 1
Digi-Key	$1.39–$3.37
LCSC	$0.39–$0.87
Mouser	$3.37

Controls

Welcome 👋

Flux helps you build PCBs faster with an AI teammate!

Create your account to collaborate, stay updated, fork your own version, and get instant answers from our AI agent.

jecstronic / FM_Transmitter

Schematic