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I'd like to hear low level microphone in the earpiece (like a normal phone). I thought this would be easy by adding an output from i2s2 into mixer input 4, but it doesn't seem to work. Any workarounds would be gratefully received.

By using capacitors in the headphone lead, it is possible to reference the signal to true gnd. See this diagram from the datasheet. For this project, I would suggest lower value capacitors, perhaps 47uF 10V, as deep bass is not required.

I have just breadboarded this with a view to installing into an old bakelite phone. I am using a Teensy 4 with a RevD audio board. In all the various versions I have looked at, each defines the SD pins as CS = 10, MOSI = 7, SCK = 14, but these are the pins for the RevC audio boards. I have...

Thanks for the link. The synth is now fully working; I've connected the FX board and I've updated the firmware. It sounds great; I just need to get my head around it now. Excellent kit and comprehensive instructions. My only query is what to do with the mains switch connection? I guess I'll...

The kit arrived yesterday. I've almost finished building it, but I now need the zipped sound/seq files. The instructions say that they are available from the TubeOhm website, but I can't find them. Any clues?

Thanks for the link, I'm sure that I will have questions. I finally got the invoice for £59.11, which includes customs duty, VAT and clearance fee (for anyone else buying from the UK). Delivery on Thursday :)

The tracking shows that it has arrived at our local depot, and that I will be contacted about the UK duty to be paid before delivery.

I think that Brexit has complicated shipping to the UK. I had to cancel my original Paypal order so that German VAT could be taken off. I then had to pay the net price via bank transfer. I will have to pay UK import duty when it arrives (soon I hope).

Thanks. I'd already spotted it and ordered one a few days ago. Just waiting for it to arrive now.

Thank you. They are currently out of stock, but I'll keep checking.

Is there any way to buy parts for this in the UK? Tubeohm say they can't ship to the UK, and Thonk don't stock it.

I've gone back to the YT video to carefully check the explanation: https://www.youtube.com/watch?v=zphkBTkOIyQ I now understand how this works and have added some explanatory comments to the code. if (digitalRead(SWlfo)) { if (LFOmodeSelect < 8) LFOmodeSelect = LFOmodeSelect + 8...

Thanks for your reply. There is already a pullup on SWlfo: pinMode(SWosc1, INPUT_PULLUP); pinMode(SWosc2, INPUT_PULLUP); pinMode(SWlfo, INPUT_PULLUP); LFO mode has 6 options, so I can't work out what the 8's are all about. SWlfo is a switch which selects between LFO control of pitch or...

Success, mostly! I've found that if I comment out the last part of the code, it works fine: if (digitalRead(SWlfo)) { if (LFOmodeSelect < 8) LFOmodeSelect = LFOmodeSelect + 8; } else { if (LFOmodeSelect >= 8) LFOmodeSelect = LFOmodeSelect - 8; } This seems a very complicated way...

Slight update: When I measure on the 4 Mux selection pins, some are high and some are low, but all static with the corresponding potentiometer value on the Mux output, suggesting that the program has stopped. I'm beginning to conclude that the Teensy 4 must be faulty, although it runs the...

I wanted to build 'Notes and Volts' TS-1 which was originally designed for the Teensy 3.2. See: https://www.youtube.com/watch?v=Inwbu9DgVeU&t=7s As the Teensy 4 was available, it seemed a better choice, so I ordered one with its corresponding audio adapter. I had to change the TS-1...