via Erica Synths
"Introducing an FM Drum circuit that fuses analog punch with metallic tones of FM synthesis. This DIY kit offers a wide range of sounds for your patches, from kicks to toms, metallic clangs and more – a great addition of versatile, rhythmic elements to your system!
We – Erica Synths and Moritz Klein – have developed a series of educational DIY kits under the brand name mki x es.EDU with one specific goal in mind: to teach people with little-to-no prior experience how to design analog synthesizer circuits from scratch. What you’ll find in the box is not simply meant to be soldered together and then disappear in your rack. Instead, we want to take you through the circuit design process step by step, explaining every choice we’ve made and how it impacts the finished module.
NB! All kits in these series are simple and come with extensive user manuals which can be downloaded separately, therefore we will not provide customer support in case your DIY build fails to function or similar."
Designing an FM Drum circuit from scratch (kick, tom, bell & cymbal)
video upload by Moritz Klein
Chapters
00:00 Intro & Sound Demo
01:46 Triangle VCO
05:56 Tri To Sine Waveshaper
07:17 VCA
11:20 Decay Envelope
12:28 Gate To Trigger Converter
14:00 VCO Reset
15:26 Pitch Envelope
18:44 Attack (Distortion & Click)
21:38 FM
25:00 XOR Pulse
27:36 High Pass
30:05 Decay CV
31:20 Tune CV
34:08 Final Demo & Outro
Build your own FM Drum as a DIY eurorack kit: https://www.ericasynths.lv/shop/diy-k...
"While trying to fix a broken TR-909, I came up with a DIY analog FM Drum circuit that combines the punchy character of the 909 with the metallic textures of FM synthesis. It comes with four different modes:
• 909-style kick/tom
• Metallic bell/gong
• Ring mod cymbal
• FM cymbal
The FM Drum is the final drum voice in my DIY drum machine series (for now). If you want to build along, here's the bill of materials:"
BILL OF MATERIALS
RESISTORS
1M x4
470k x3
330k x1
200k x1
100k x15
68k x1
51k x2
47k x1
39k x2
33k x3
18k x1
10k x7
5k6 x1
4k7 x1
2k x2
1k x1
470 x1
47 x1
CAPACITORS
1 uF x1
470n x1
15 nF x1
10 nF x1
5.6 nF x1
2.2 nF x1
470p x2
330p x1
SEMICONDUCTORS
1N4148 (small signal diode) x18
BC548B (NPN) x8
BC558 (PNP) x5
TL074 (quad op amp) x1
TL072 (dual op amp) x1
POTENTIOMETERS
2M (trimmer, W205) x1
1M (B105) x1
500k (A504) x1
250k (B254) x1
100k (A104) x2
100k (B104) x1
MISC
Switched mono jack socket x5
Single pole, double throw switch x2
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