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Home / Essays / 2015 / April / TTSH VCOs and VCF Done and Tested
April 11, 2015

TTSH VCOs and VCF Done and Tested

Now that I have all components available, I was able to build up the three VCOs, attaching the small boards with the according connectors to the main board:

Main Board, VCO 1, 2 and 3 with Small VCO Boards MountedComponent side, jacks, switches and sliders still missing.
Main Board, VCO 1, 2 and 3 CompletedBack side, jacks, switches and sliders still missing.

Meanwhile I had also finished the VCF part. As you can see I'm not using the built-in power unit, but will be using my own external power supply:

Main Board, VCF CompletedComponent side, jacks and sliders still missing.
Main Board, VCF CompletedBack side, jacks and sliders still missing.

With those parts done, I could do some first test. I've connected the main board to my power supply and connected things to my oscilloscope:

Mainboard VCOs and VCF Testing

Happily all seems fine so far. The correct waveforms are visible for the three VCOs and also at the output of the VCF. In the following images the upper yellow waveform is the VCO output and the lower blue waveform is the same signal passed through the VCF.

VCO 1, square waveform:

Testing VCO1 Square Signal and VCF Output

VCO 2, triangle waveform:

Testing VCO2 Triangle Signal and VCF Output

VCO 3, saw waveform:

Testing VCO3 Saw Signal and VCF Output

So far thus no soldering errors, all seems to be working as it should.

Read more in TTSH

TTSH ADSR and AR Done and Tested The TTSH Story Continues - All Components…
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Links
  • TTSH 21: PSU Reloaded
  • TTSH 20: Midi2CV
  • TTSH 19: Case
  • TTSH 18: Test of Finished Board
  • TTSH 17: Main Board
  • TTSH 16: LED Drivers, Jumpers and Headers
  • TTSH 15: S&H, Internal Clock, Analog Switch and Amplifiers
  • TTSH 14: Mixer, Reverb, Noise and Voltage Processors
  • TTSH 13: Preamp, Envelope Follower and Ring Modulator
  • TTSH 12: VCA
  • TTSH 11: ADSR and AR
  • TTSH 10: VCOs and VCF
  • TTSH 9: All Components Available
  • TTSH 8: Thonk and Balzer Components
  • TTSH 7: Transistor Matching
  • TTSH 6: Soldering
  • TTSH 5: Mouser the 2nd
  • TTSH 4: Mouser Components
  • TTSH 3: Components and PSU
  • TTSH 2: Delivery
  • TTSH 1 - The Story Begins
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