techno-womble

Love the video! Glad you enjoyed the project.

Hi Trevor,It made my day reading your kind comments! Many thanks!

Thanks!

Hi. I'm sorry I have no idea what the problem is. All the errors seem to relate to the AudioOutput.h file so I would suggest checking that it's not corrupted in some way. Maybe remove and re-install the Mozzi library. Sorry I can't be of more help.

Love it!

I'm not sure I can help with the compilation errors but the distortion is almost certainly related to that as the output is scaled up for Hi-fi mode. I'll double check the instructions I posted to make sure there are no errors. I also thought about making a small 'dead zone' in the centre of am/fm control but I don't think it's possible using fast integer arithmetic. The only way I can think of is to use a pre-calculated lookup table but it would have to be fairly 'steppy' given the Nano's memory limitations.

Hi Trevor, while MIDI input isn't possible with the current design it would be possible to add it. There are many simple circuits online to add a MIDI interface to any Arduino and the Mozzi sound library contains MIDI functions. My preferred method for getting pitched notes is to use the software sampler in my DAW (Tracktion). Obviously, this only works if recording with a PC but you get a lot of extra functions in terms of time stretching and looping. To my mind it's very much in the spirit of 'Radiophonic' music. Cheers, John

Very neat breadboard. Mine look terrible!

Hi. Linear pots will work without changing the sound. Log pots are generally used for volume controls because the response of the human ear to the loudness of sound is also logarithmic. Using a log pot therefore gives the effect that a setting of full volume on the control sounds twice as loud as a setting of half volume. A linear pot used as a volume control would give large apparent changes in loudness at low volume settings, with little apparent change over the rest of the control´s range. If this proves to be problem you can convert a linear pot to logarithmic by adding a single resistor between the centre pin and ground. There's a good discussion here - http://geofex.com/Article_Folders/potsecrets/potsc... - the relevant section is near the end. Good luck with the build!

Thanks for building it - great to see another one! If you want to make real-time changes to the sound you will need to put the code in the updateControl function (starting line 95). This is the main loop when using the Mozzi library. It is called 128 times per second as defined by CONTROL_RATE (line 20). Hope this helps.

That's odd. It compiles without errors for me. My only thought is that it might be device specific. I used an UNO - maybe other Arduinos are different? The serial port was used for testing but isn't used in the final version. You can safely delete line 75 of the sketch (Serial.begin(9600);)

The maximum voltage present is 5V so any will work. The capacitor is not a critical component so feel free to experiment.

Hi, the maximum voltage present on the circuit is 5v so any value will work. The capacitor isn't a critical component so feel free to experiment. If you connect the MiniMin to a small speaker you can leave the RC network and socket out entirely.

Sorry about this but there is an error in the circuit diagram. It shows a polarized capacitor that is connected the wrong way round. My mistake. Connecting the side with stripe to GND should fix it. Alternatively, a non-polarized capacitor would work.The flashing LED is a good sign as the pitch sensor is connected to the same pin as the internal LED. I'll update the diagram.

Hi, the diagram is correct and the capacitor is connected between the PWM output and GND. The PWM output is a string of digital pulses. If the pulses are high enough frequency they will charge the capacitor and give a rising voltage on the output. If the pulses are of low frequency the capacitor will discharge and the output voltage falls. By varying the pulse frequency (or pulsewidth) a waveform can be generated. This Instructable goes into much morte details https://www.instructables.com/Arduino-RC-Circui...

Once the zip file has been downloaded it must be added to the Arduino IDE. From the top menu choose Sketch -> Include library -> Add.ZIP library. Hope this helps

Beat me to it. Thanks!

Thanks for spotting the error in the socket wiring! The resistor/capacitor network acts as an integrator to smooth the rapid pulses from pin 9 into an analogue audio waveform. The values of 270 ohm and 100nF (0.1uF) are standard for this kind of application.

Any audio socket will do. Just as long as you have the correct cable to connect to an amplifier.

Thanks for the comments. Good point about the libraries. I'll add the URLs to the code