Barre Rolzer Curry Barre

The new modules from Ieaskul F. Mobenthey should be ready to order soon.

In addition there is a barre controller, which is a simple passive affair, no circuit board,

just four bars with piezo and output jack (the inputs of Mobenthey modules are tailored to take piezo)

Tocante has made a version of the rolz-5 circuits. It is an expansion board for the plumbutter. Plumbutter has that nice voltage control for each of its rhythm generators (rolz) but they lack the pure crunchy ultrasound paradox capability of the simple rolz. This expansion board is to make up for that; the rolz are tuned by capacitors, in the range of 1 microfarad, through 1.5, 2.2, 3.3, 4.7, 6.8, up to 10 microfarads (allegro to larghissimo). The odd beats and strange interjections are caused by wiring them to each other. They are all "brown nodes" as on the plumbutter, androgynous, both input and output. Here, they are processed by plumbutter's ultrasound filter, and a gongue and snare drum.

http://ciat-lonbarde.net/rollz5/
http://ciat-lonbarde.net/plumbutter/
http://synthmall.com/tocante/

Check Synthmall.com for to see Tocante and Ieaskul F. Mobenthey

yewSOL

To work with solar panels, you have to sit outside.

Prototyping electronics, one rarely gets to work outside. Testing solar panels, however, is a good chance to get out, at least for a little bit.

What I have are a hundred pieces of six volt, hundred milliampere panels. I am using them to charge two varta three-packs of nickel metal hydride cells, totalling a normative voltage of seven point two. So, of course I made a switching boost circuit, comprising an n-channel mosfet that momentarily pulls an inductor to ground, but when current develops through the inductor to positive, a capacitive coupling to pnp turns the mosfet off. Thus the inductor circuit oscillates at its ideal, between 8000 to 320000, depending on load. I initially wasted a lot of time with so-called "joule thieves," but these were the least efficient, compared to a snappy mosfet action plus tightly factory bundled inductor.

So, my only modification to check outside with the panel was the hypothesis that, when the battery was completely discharged, the switcher should be inhibited, yielding pure DC through the inductor and diode. So I made a simple PNP switch comparing panel voltage to battery voltage, to control the switcher bias. I discharged a battery pack completely, and attached it to the circuit. DC flowed and switcher was off, success. However, I noted that the efficiency was only about 150% better, and most importantly, the NiMH only stayed below 6 volts for a very short period of time. Thus, I'm not going to add this mod, because it really doesn't help. I've found that a NiMH acts like a capacitor when discharged, so it charges up really fast. It is only when it is up at its voltage, that injecting more current is what re-alchemizes its chemistry. Also there is various literature pointing to the aggressive pulsing of a switcher actually helps keep the chemistry good in a battery. The most important thing about this switcher is that the panel can be small; it is matched to the wattage dimensions of the battery, and that it works even in room light, so it is always adding charge.

I'll talk about this later, but there is a deep thesis in solar powered electronic music. The idea is that you should be playing during the day while it charges, and use the battery powered sounder at night, around the campfire, to scare away ghosts, or in a cave, to hear the galleries and depths.