Now that the complete board is done, I could perform a first test. This covers VCO 1, 2 and 3, VCF, ADSR, AR, VCA, noise and sample&hold. At first all seemed to be working, but then I noticed two defects:

  • One of the VCOs generated a way too high frequency compared to the others.
  • The fine tuning of VCO 3 didn't have any effect.

It turned out that I had two bad soldering points: The 680pF capacitor on one of the VCO boards was loose on one end. And, the same was true for the 3.3MΩ resistor connected to the fine tuning slider of VCO 3. Correctly soldering both points luckily fixed this.

Here are two pictures of the main board functioning:

Main Board Detail20150512_211044_5487
Main Board Detail
Slider LEDs working.
Main Board Detail

Main Board Working20150512_211544_5488c
Main Board Working
All Slider LEDs working, sounds can be produced.
Main Board Working

Mounting the front panel already gives a good feeling of how the TTSH will be:

Front Panel Installed20150513_224357_5490c
Front Panel Installed
Front Panel Installed

Installing and connecting the speakers and spring reverb will allow standalone use:

Main Board with Speakers Installed20150513_225234_5491c
Main Board with Speakers Installed
Power and spring reverb connected.
Main Board with Speakers Installed

Power Supply, Spring Reverb and Speaker Connections20150513_225536_5492c
Power Supply, Spring Reverb and Speaker Connections
Power Supply, Spring Reverb and Speaker Connections

Next I can work on calibrating the system and doing several more testing. Last but not least I'll need to start working on a case.

And here's a first little noisy trial, which I call “At the Sea”, using a patch as shown:

Patch: At the Sea20150523_190122_5577cr
Patch: At the Sea
Slowly rising VCO3 volume into mixer (VCF input) for the tingling, high frequency sound. Pushing manual trigger button from time to time to emphasize the wavy noise sound.
Patch: At the Sea

Listen to “At the Sea”:



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