Linux, Music, Synthesizers, Photos, Books, Cars and More by Peter Kamphuis
New web pages since October 2022, combining my old www.campacasa.eu, linux.campacasa.eu, photo.campacasa.eu and synth.campacasa.eu websites and adding new content.
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Today I've mounted the last electronic parts, the LED drivers. Also the 7 jumpers for these and some headers to later connect the peripherals to. The next step will be the switches, sliders and jacks.
Earlier this week I've finished the Sample&Hold, Internal Clock and Analog Switch part:
Earlier already I finished the mixer and reverb section:
Yesterday I have also finished the section with preamplifier, envelope follower and ring modulator:
The next section I've done is the VCA:
Next to the VCF section is the ADSR and AR section, which I've finished now, too:
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:
More than one month has passed, but finally I have managed to get all the required components. I was still missing the 2N4125 transistors for the small VCO boards and 4 ceramic capacitors of 5pF. As replacement for latter I got some 5.1pF capacitors through some relatives in the …
At Mod Wiggler I've found some hints and a circuit for transistor matching. I've built that circuit on stripboard and now can start with the transistor matching: The TTSH design uses various pairs of 2N3904 and 2N3906 transistors. These pairs should each have a very similar base-emitter voltage (within 2 mV difference).
