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It's a nice old farmhouse on 5 acres in Lovettsville, with a nice little creek running through the property. Until today, when fizzygeek and I spent the afternoon with an attorney. Two and a half years ago, I posted that I was debt-free. I did this because the low voltage 'ground' wasn't actually ground, but the switching transistor, and I didn't want to ground an 800 volt signal through the low voltage switching power supply transistor. In the process, I modified the CCFL supply slightly by cutting a trace to separate the low voltage ground from the high voltage ground. The switching regulator chip replaced the voltage reference, op-amp, and power transistor with a single part, and added some nice protection circuitry as a bonus. This was appealing, as it would be both more efficient and have a smaller parts count. However, the tubetime documentation explained that the design was derived from a Jim Williams application note, so I read it and saw that Williams' original design didn't use an linear analog feedback loop like the tubetime version, but employed a switching voltage regulator chip instead. A quick breadboard showed that it worked as desired. All I had to do was add a rectifier and reservoir capacitor to convert the high voltage AC output to the high voltage DC I wanted, just as was done in the tubetime design. Eyeballing the schematic showed that the core of the design was the same lashup used in the CCFL supply. However, complete CCFL modules are, inexplicably, cheaper.

The CCFL transformer itself, while common, is still a specialty part. I figured I'd breadboard it and see how it performed. I found a nice design at tubetime that used a CCFL transformer in a lashup using a voltage divider to sample the high voltage, a voltage reference for comparison, an operational amplifer (op-amp) to compare them, and a power transistor to control the CCFL circuitry. Since they're so common, the associated high voltage power supplies and the parts they're built from are also common. These are long thin tubes that are light by (aha!) high voltage. LCD screens need backlights, and one popular technology for backlights is the 'cold cathode fluorescent light' (CCFL). Happily, there is a current source for high voltage transformers. As I like to share my designs, I'd prefer to use current production parts that other people can obtain fairly easily and cheaply.

In this arena, parts to produce high voltages are uncommon. 3.3 volts was popular for a while, and newer devices run on 1.8 volts. For a long time, 5 volts was the norm, and now voltages are getting even lower to support both devices with smaller geometry and reducing power consumption and its attendent heat generation. These days, electronics are solid state, and run on low voltage. When vacuum tubes were common, high voltage power supplies were too. The first order of business is to come up with the high voltage itself.

Additionally, CRTs need several different voltages to operate their various electrodes. An ordinary small CRT generally needs a thousand volts to operate. However, CRTs need higher voltage than most vacuum tubes. Like other vacuum tubes, CRTs need both a heater supply and a high voltage supply.

To do so, I need to come up with an appropriate power supply. Accordingly, I'd like to make a CRT-based art project. I like the look of them in operation, an electron beam painting glowing lines on a phosphor screen. My fondness for vacuum tubes extends to cathode ray tubes (CRTs), which were ubiquitous for decades in television sets, as well as technical equipment like oscilloscopes.

Gutenprint olympus p 11 printer driver mac