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runni 21 minutes ago
First test circuit run on single side board, an old 8051 set the current. Output with out thermal stabilisation better then +/- 50µA. All curent measurment resistors 0805 0.1%. Output 1....40mA with out heatsink.
Digital control constant current source
ervin brucal
ervin brucal 29 minutes ago
hi joost, how to calibrate? thanks. regards, ervin
RF Power Meter with 1MHz-10GHz bandwidth and 55dB dynamic range
runni 5 hours ago
Now high precision resistors are cheap, this why this circuit has an good stability and low error, an digital pot brings big problems in temperature and load stability. I have an lot of metal-can (H) LM723 in storage, is also available in surplus, has an better stability. The LED in LTSpice: you can use any kind of load, what you want.
Digital control constant current source
TonGiesberts 5 hours ago
The choice made to use a toroidal core was never about size. Putting a toroid upright saves space of course. You should really read the information of the manufacturer ( about iron powder cores and the -2 material. The gap is distributed across the entire core. There’s no need to have a gap with this material. As stated already in the text the inductor is extremely linear and saturation occurs theoretically at 70 A because 1.5 mm copper wire can handle that large a current. Food for thought: maybe one should wonder what the contribution from the polypropylene capacitor to distortion in the output filter is... The first mentioned inductor you intend to use is not suited for class-D amplifiers. It has an almost linear decrease of inductance with increase of current. This inductor will produce a fair amount of distortion. Inductors that are intended for DC-DC converters and automotive are usually not suitable for audio. Look for inductors that are specifically designed for class-D if making the inductor as described is not an option. Find one that is specified for 30 A at least. If you find one, please let us know.
200W Class-D Audio Power Amplifier [150115]
Michel Förch
Michel Förch 1 day ago
I'm so sorry for not answering your question earlier! (weren't there notifications when there is a comment on your own project? -.- ) I'm not sure wether it is too late to help you, but I will look for the code and upload it here next days.  Quick update: The project is now dead for about a year now. First problem was that version 3.0 killed 2 SIDs in a row without any obvious reason. The latest version used a raspberry pi and some logic ICs to communicate with the SID. The Pi itself runs an 6502 emulator which I wrote for a school project to interpret the SID-files. After about one day of debugging it played most of the tunes the Hardware-Player could do. But then after about a week of operation the first 6581 quit without any prewarnings. I thought it was just old and "had to die" but the next Chip (8580) was fried just about 2-3 hours of playing later. Now I'm not sure wether it was just a bad coicidence or my player doing something wrong. A nano SwinSID worked great BTW. : I also started to study and time is pretty rare at the moment. Maybe I will give it another try in the future. As I said I will try to find the code, but don't expect to much. It's a mess :D Best regards Michel
MOS6581/MOS8580 based Chiptunes-Player for .SID-file-format