Thursday, April 27, 2017
In this video I show what I did to resolve my power supply issues on the Oberheim Matrix-12 analog synthesizer. Symptoms were intermittent non-boot, locking up, and the dreaded Voice 1 Processor Malfunction message. Along the way I'll talk about how the power supply works and how it is different than many synths from the era prior to this. Even though the Oberheim Xpander is a little different than the Matrix-12, its power supply works exactly the same. This may not enable you to fix your Matrix-12/Xpander completely, nor answer ALL questions you may have...but hopefully it will be helpful information.
YOU ASSUME ALL RISK WHEN REPAIRING YOUR OWN ELECTRONIC INSTRUMENTS! There's no shame in asking a friend for help or taking it to a reputable synthesizer technician. BE SURE TO UNPLUG THE SYNTH PRIOR TO DOING THIS KIND OF WORK.
1:10 Getting Started
1:54 Dealing with an SMPS
3:16 Why did Oberheim use an SMPS?
3:40 Why I'm NOT going to troubleshoot this power supply
4:38 Power Supply Restoration and Results
Here are the Mouser parts numbers:
Power Entry Module - 871-B84771A0001A000
2W Shunt Resistors 0.1ohm - 667-ERX-2SZGR10V
sorry I don't have capacitor numbers, I did that work 2 years ago
Monday, April 24, 2017
The Oberheim Matrix-12 was cooperating today, so I thought I better make a video before something happens again. Using some reverb and delay, recorded direct and no audio post processing.
Monday, April 10, 2017
Rolling out some new patches for the Juno-1/2 available on my download post for this blog. A full bank of patches including the sounds from Demo #1. In this video I have selected a few of my personal favorites: bass, arpeggios, and soundscapes/pads. There are copious amounts of Big Sky reverb, a couple of sounds use the Timefactor delay. Basses don't usually need anything. Sounds were programmed using the indispensable Stereoping synth controller, also used briefly in this demo. Recorded direct through a Mackie 802-VLZ mixer to a Tascam DR-05.
0:00 Cloud Bank
0:56 Aurora Pad 2
1:14 Bass Arp 01
2:14 Mod Bass
2:25 Juno Crush
2:37 Alpha Synth
2:51 Micro Fab
3:24 Bass Pedalr
3:35 Mono Bass
4:10 Synth Mutes
4:25 Fake Wurli
6:07 Psycho Sweep
6:32 Pure Space
Tuesday, April 4, 2017
Designing a module such as this has its challenges. Things happen when you are designing a module on your own, and building it with your own two hands. Just last week I thought the project was dead in the water. But I persevered once more. I have risked everything, all my cards are on the table. The DRE4MTR4CK has been my labor of love for over 2 months in the making. With hard work, persistence, and steady dedication the DRE4MTR4CK is now a reality. An organic melody progression sequencer, with polyrhythmic capability.
Performance using evolving chord changes with my custom DRE4MTR4CK Euro module. It has 4 independent tracks of polyphonic pitch control:
Track 1: Pittsburgh Synth Box, internal filter
Track 2: DNA Symbiotic Waves, JP-6 Filter clone
Track 3: Disting MK3, Doepfer SEM filter
Track 4: Rings, no filter.
Clocking direct to envelopes, triggering pitch changes manually. Track 1 pitch CV is going through a PM Toolbox slew limiter. Mix is going to Timefactor delay. Recorded direct through a Mackie 802 to a Tascam DR-05.
Sunday, April 2, 2017
The DRE4MTR4CK is a simple and intuitive Pitch CV sequencer. It has 4 steps, and it has 4 Individual tracks. Each track has its own clock input, clock output, and Pitch CV output. In this way, it can behave like 4 completely independent sequencers.
In this video I show how to use the DRE4MTR4CK in more detail.
1:23 Installation Options
Correction: the graphics say -5v when it should say +5v (positive 5v).
3:06 Boot-Up Defaults
3:32 Connections and Operations
DRE4MTR4CK is a custom module built by hand. Full specs available on my previous post.