C.K. builds a LFO100 kit from Feedback Modules, eurorack

Описание: NOTE: The version 1 board labeled MAIN1 has a misprint on the orientation of transistor Q5. I spoke with Feedback Mods and he sent me the correction, I point out what needs to be done twice in this video, or ho to the chapter marker listed below.

I also pasted the calibration instructions under the chapter list.
A multi-wave, multi output LFO. A somewhat involved build, since it’s a stack of three circuit boards, but not too difficult, just a lot to do.

And with the transistor in the right orientation it works just fine. A handy expansion LFO.

\0:00 opening
0:10 intro
0:38 Correct orientation of transistor Q5
1;59 what’s in the bag
11:00 build begins
26:36 Where the 10 ohm resistors and the inductor go
41:14 Correct orientation of transistor Q5 again
42:34 calibration
49:56 demo

Calibration instructions
“Insert the jack in SAW waveform, using an oscilloscope trimm VR3(WAVE.ADJ) until you have a perfect saw waveform at output.
Trimm VR4 (SAW.OFFS) until the saw waveform is exactly above 0 line of the oscilloscope, pay attention to not have clipping of the waveform up or down.
Check the triangle level on TRI output, it's probably around 9,3Vpp. Probe the main OUT of the LFOcand move the switch to triangle.
Adjust VR1 (LEVEL) until you have the same amplitude as TRI out (probably 9,3Vpp). If you can't, just as close as you can.
Probe the square output, switch the frequency to high and turn the frequency knob at maximum.
Using a frequency counter or the counter of the oscilloscope, trimm VR2 (FREQ.ADJ) until you read 30HZ.
”

Product link
https://www.thonk.co.uk/shop/feedback...

Making the silicon rubber solder helper used in this build video;
   • C.K. makes a silicone rubber Solder pad, s...  
Intro music by C.K. Haun (me), you can listen on YouTube
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