I’ve been busy! I’m now developing and designing circuits for Eurorack and breadboarding projects. I’m calling this new venture “Song Naga” since modular synthesis is a snakey business in my experience. Here’s a list of what I’ve been up to:
Projects
Eurorack
- Two Headed Cockatrice (Dual Deluxe VCADSR) – this is in early concept stages, and I’m starting to test circuits for the final design. This module has two CV-controlled ADSR’s. The second ADSR also includes a voltage controlled Delay stage and is normalled to trigger when the first ADSR is triggered. Each envelope shares a CV input for each stage, with attenuators to adjust the amount of effect the CV input has on each envelope. A mix out section provides for a complex output based on the two envelopes.
- Slewpreme (Voltage Controlled Gated Integrator) – this is in early design stages, and is waiting for ‘Lil Slewy to be successfully completed before more work on this begins in earnest. This version has CV controlled up and down ramp times, Log/Linear response adjustment, and gate-able control.
- ‘Lil Slewy (2hp Integrator) – my first module! A simple integrator, currently in late design phases.
- ‘Lil Wyrm (2hp unpowerd dual attenuator) – in early design phases
- Fuzzgug (cascading multi-distortion) – another early concept, bringing together multiple classic stomp box distortions into a Eurorack module.
Breadboard Buddies
These are small circuits designed to be plugged directly into a breadboard to either provide access to a critical user interface component such as a a knob or a switch to more complex, integrated building blocks, such as an amplifier or distortion circuit.
- Jack – v1 complete, stock has been ordered
- Pot – v1 complete, stock has been ordered
- Switch – v0.1: holes for switch are too small to fit.
- Amplifier – v0.2 waiting on parts to arrive before testing, v0.3 has been designed and moves the electronics components to the underside of the board, reducing its size by about 1/3.
- Distortion Series
- Silicon Fuzz Distortion – v0.1 looks promising, waiting on parts to arrive to test, but breadboard pin connectors are fragile and need more structural support. v0.2 is designed to address this, but hasn’t been ordered as I want to test the circuit first.
- MXR Distortion + – v0.1 has the wrong space for the diodes, v0.2 addresses this
- Proco Rat – v0.1 has the wrong space for diodes, v0.2 addresses this
- Maxon 808 – waiting to be breadboarded
- Boss DS-1 – waiting to be breadboarded
Parts in my Tayda cart and what they’re for:
I’m currently limiting orders to electronics suppliers to once a month to save on shipping costs, so I often drop something into a cart with the intention of getting it in my next order. Here’s what those things are for:
- LM339 and LM393 – these comparators are for the delay circuit for the Dual ADSR
- BC548 – these transistors are used in the delay circuit for the Dual ADSR, I’m currently substituting 2N3904 in their place
- 5mm washer – it’s nice to have washers on eurorack jacks, will these fit? If so, there’s no need to have to order washers from Thonk.
- 330 ohm 0805 resistors – needed for the Silicon Fuzz Breadboard Buddy
- LM1458 – for the Maxon 808, I ordered 1 last order but the circuit uses 2. Also ordered 1 SOIC, so adding 5 more so I can theoretically build 3 test versions of the breadboard buddy version of this circuit.
- LM79L05 – negative 5V voltage regulator for ADSR projects
Last Tadya Order:
- 4053 CMOS
- BS170 MOSFET
- 1N5817
- 1N914
- 1N4742
- 2N5088
- BC549
- 1K linear and log 9mm pots – for breadboad buddy pots
- BC546
- BC556
- 4.7uf 5mm Electro caps
- 1N4739 – 9.1V zener diode, this thing is supposed to be able to take 12V and output a steady 9V, ideal for use with stomp box circuits designed for 9V.
- 78L09 – for breadboarding experiments, this is supposed to be able to adapt +12V to +9V, ideal for use with stomp box circuits designed for 9V.
- 470ohm 0805 – for the Mini-Amp
In the Mouser Cart:
- 22uF and 2.2uF 0805 caps – for the Silicon Fuzz Breadboard Buddy
- NJM3404AD IC – for the Boss DS-1
- RC4558P IC – for Opamp Big Muff
Specialty Parts for upcoming builds:
(check to see if these need to be ordered)
Maxon 808
- A500k pot
- W20k pot
Boss DS-1
- 2N5055 transistors (2x) – can’t find this on either Tayda or Mouser
- B25k pot
On the Breadboards:
Current build: basic ADSR using the AS3310 IC
Next build: Boss DS-1, subbing IC w/ a TL072/4