29-Oct-2008 - The VCO mixer 1 module
I don't know when i started developing this module, but as you can see, there was a break of nearly 2 months on MonoMiK development. I was very low on motivation due to my job, so everything has gone a bit slow. When there is no sun shining outside, the power is decreased a lot. So even after i finished developing the module and creating the PCB layout for it, starting putting it together, it took nearly another 2 months until i could complete the module during the next vacation. On 22-Dec-2008, i could do the firsts tests of it, the module is completed now.
Now it took some programming and a bit more work to test the modules together with the VCOs to see if all the features really work. The programming was necessary as i use TWI I/O port chips to control the analog switches, which select the waveforms. While on it, i also created some of the small LED modules for the front panel LEDs, which show the 6 waveforms for the VCOs and the 2 waveforms of the sub oscillators, together with overdrive LEDs for VCOs and sub oscillators. 2 spare LEDs for the VCOs are included, they will show the state of VCO sync and keyboard tracking later.
02-Jan-2009
The final test of the VCO mixer 1 module, together with one VCO module, the ladder filter module and the two ADSR modules. Everything works as desired and it really doesn't sound bad. The output VCA was the MicroModules VCA module, as the MonoMiK currently doesn't have an output VCA itself.
Again, i needed to split the video into two parts due to the length, so the left video is the first part, the right video the second part.
This module features the waveform selection for one dual VCO module (where you can mix any combination of sawtooth, inverted sawtooth, triangle, sine, pulse and square) and one sub oscillator (1 and 2 octaves below the VCO frequency) per VCO with the waveform selection. Those raw signals are fed to the backplane for modulation purposes, besides this, 4 VCAs are present on the module for those 4 outputs. They are controlled by the front panel knobs and by CVs on the backplane. Last, 4 overdrive detectors are available to show if the output of the corresponding VCA is off limits, which is useful, as due to mixing the waveforms, the output level can vary a lot for the different combinations.
Board layout: here
page: 6/6
I don't know when i started developing this module, but as you can see, there was a break of nearly 2 months on MonoMiK development. I was very low on motivation due to my job, so everything has gone a bit slow. When there is no sun shining outside, the power is decreased a lot. So even after i finished developing the module and creating the PCB layout for it, starting putting it together, it took nearly another 2 months until i could complete the module during the next vacation. On 22-Dec-2008, i could do the firsts tests of it, the module is completed now.
Now it took some programming and a bit more work to test the modules together with the VCOs to see if all the features really work. The programming was necessary as i use TWI I/O port chips to control the analog switches, which select the waveforms. While on it, i also created some of the small LED modules for the front panel LEDs, which show the 6 waveforms for the VCOs and the 2 waveforms of the sub oscillators, together with overdrive LEDs for VCOs and sub oscillators. 2 spare LEDs for the VCOs are included, they will show the state of VCO sync and keyboard tracking later.
02-Jan-2009
The final test of the VCO mixer 1 module, together with one VCO module, the ladder filter module and the two ADSR modules. Everything works as desired and it really doesn't sound bad. The output VCA was the MicroModules VCA module, as the MonoMiK currently doesn't have an output VCA itself.
Again, i needed to split the video into two parts due to the length, so the left video is the first part, the right video the second part.
This module features the waveform selection for one dual VCO module (where you can mix any combination of sawtooth, inverted sawtooth, triangle, sine, pulse and square) and one sub oscillator (1 and 2 octaves below the VCO frequency) per VCO with the waveform selection. Those raw signals are fed to the backplane for modulation purposes, besides this, 4 VCAs are present on the module for those 4 outputs. They are controlled by the front panel knobs and by CVs on the backplane. Last, 4 overdrive detectors are available to show if the output of the corresponding VCA is off limits, which is useful, as due to mixing the waveforms, the output level can vary a lot for the different combinations.
Board layout: here
page: 6/6
Page last modified on Friday 12 of March, 2010 16:24:02 CET
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