Moog Highpass Transistor Ladder Filter - DIY Modular in a Week 7.5

Here is a really nice sounding highpass filter. The character is very organic or voice like with a throaty or nasal sound to it. It is very different in the sound from the other filters we have done before. This is however a very difficult filter to build with loads of components, 8 opamps amongst others, and 4 of these has 2 transistors connected to them each! So not a build for the novice... But if you have done all the other modules in this series, you should be ready for this... ;)

Day 7: Filters
Part 5: Moog inspired Highpass filter
Difficulty: Hard
Price: ~12$
MiaW playlist: https://www.youtube.com/playlist?list=PLyE56WXw0_5Q5QGMEXWmskuhojKyRdA3T

Visit my Patreon page for more (different) content, or if you just want to support my work more than just a thumbs up :)
https://www.patreon.com/SourceryOne

Link to the schematics:
http://www.synthdiy.com/files/2008/moog-hp.pdf

Link to the frontpanel design:
https://www.dropbox.com/s/272qe1ygjhgn4zn/7.5%20EFM%20Moog%20type%20Hipass%20VCF.svg?dl=0

Buy components from one of my favorite seller on ebay below:

Buy 10pcs of LM13700 for 5$ here:
https://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&toolid=11800&pub=5575103922&campid=5338181421&mpre=https%3A%2F%2Fwww.ebay.com%2Fitm%2F10PCS-LM13700-LM13700N-INTEGRATED-CIRCUIT-LM13700N%2F311609686385%3Fhash%3Ditem488d627971%3Ag%3A57QAAOSwv9hW4sy8%3Ark%3A1%3Apf%3A0
And a bunch of 2N3904 and 2N3906 for 1$/100pcs here:
2N3904: https://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&toolid=11800&pub=5575103922&campid=5338181421&mpre=https%3A%2F%2Fwww.ebay.com%2Fitm%2FHot-100pcs-2N3904-TO-92-NPN-General-Purpose-Transistor%2F201499277302%3Fhash%3Ditem2eea4af7f6%3Ag%3AsEsAAOSwbsBXlbWu%3Ark%3A1%3Apf%3A0
2N3906: https://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&toolid=11800&pub=5575103922&campid=5338181421&mpre=https%3A%2F%2Fwww.ebay.com%2Fitm%2F100PCS-2N3906-TO-92-General-Propose-PNP-Transistor-Top-Quality%2F311783647662%3Fepid%3D1045880140%26hash%3Ditem4897c0e9ae%3Ag%3AnmYAAOSwTuJYr~V0%3Ark%3A2%3Apf%3A0

Link to oscilloscope:
https://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&toolid=11800&pub=5575103922&campid=5338181421&mpre=https%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_from%3DR40%26_trksid%3Dm570.l1313%26_nkw%3DDSO138%26_sacat%3D0

Видео Moog Highpass Transistor Ladder Filter - DIY Modular in a Week 7.5 канала Kristian Blåsol