After some very helpful assistance from some of the folks on the Muffwiggler forum (and Pharmasonic), I’ve determined that all the LM301 opamps I purchased off eBay are bad. I found 3 opamps that I had ordered for the S&H and Mixer units in my 1st round of work on this project that LM301 compatible, …
Continue reading “Today’s Lesson: Don’t order IC’s from China”
After a few days of nagging Pharmasonic and many users of the Muffwiggler forums, I have managed to troubleshoot the 1st of my problematic modules, the 707 Amp/EF/Integrator, and this process has uncovered problems in several of the other modules as well. It turns out the LM301 opamp IC’s that I bought are bad. These …
I was able to throw together a 3 row 84hp wooden rack after some Youtube videos about box joints and purchasing a dado saw blade. The fleet looks much more impressive in a rack rather than spread out across my desk. This rack is intended for a future project, but can conveniently hold this one …
I definitely went a little OCD the last week or so while I built out these modules. My goal was to have them completed by October, reality had me building them to be ready by September. This was ultimately a good move, as I’m beginning to realize that a great deal of testing and calibration …
PCB’s arrived on Friday, while I was out of town for the weekend, of course. I was able to get home on Sunday in time to build out the patch bay and the noise source that day. Monday was spent with the VCA’s. I built both at the same time, which did help cut down …
I have sorted all my bits. I have separated 1% tolerance resistors from the 5% resistors, then sorted each group into order of resistance. I have separated the electrolytic, tantalum, and ceramic caps. I filled a 40-drawer storage box with IC’s, transistors, trims, switches, sockets, and other parts, each meticulously labelled. I have filled 4 …
Ok, This is not quite the VERY first test of my test rack, but the first worth capturing on video. My very first successful test involved turning on the power supply to watch my 2hp MIDI module light up and test its USB connectivity. I was able to get it recognized in my audio software …
My planned build order for modules starts with the 708. I currently have no audio source so there is not much to test with in my test rack for the time being. With a noise source I can at least confirm that the mixer and S&H units work as expected. I’ve been notified that my …
Orders have been placed for what I hope are all the components needed to build Block 1. Additionally, Pharmasonic made available the 707 Amp/Env. Follower/Integrator unit, which then prompted another round of ordering. Looking through the Build Docs for these units, several require an Oscilloscope to calibrate. I’ll need to either throw down for one …
The vision: All that is missing here that was on the original Roland System 700 Block 1 are the voltage processor, envelope follower, integrator units, spring reverb, panning, and stereo VU’s. I’m not worried about replicating the reverb, stereo features, or VU’s at this time. Pharmasonic is prototyping a 707 module, which is an amp/env …
