Create project Need help?
  • PROJECT STATUS
  • CREATION PERIOD
  • BADGE
Latest comments
Richard Shadbolt
Richard Shadbolt 2 days ago
Hi Ton, Thanks for the reply and clarification of the use of the toroidal core. In reading other texts, polypropylene capacitors have less distortion than polyester - but these texts refer to low voltage use - the text refers to no distortion for polypropylene - book i refer to is Design Of Active Crossovers. I did notice that the inductance decreased with an increase in current - but the maximum current is assumed to be a lot less than 15amps - for domestic listening levels. The inductance versus current curve is reasonably flat up to 5 amps for the inductor mentioned. I will continue to search and post any findings. The datasheets for components never seem to provide the required details - such as inductance expected for capacitors, or capacitance expected for inductors etc. , however low that they may be. Price is not guaranteed to obtain the optimal component either. Regards, Richard.
200W Class-D Audio Power Amplifier [150115]
runni
runni 2 days ago
Test with more than 70mA, shows the resistors with 125mW less power tolerate. I think for 0805 resistors is from 0 to 25mA in 100uA steps better, for more power, use bigger resistors.  
Digital control constant current source
runni
runni 2 days ago
Parts: Relais from german shop Pollin: No.  340 781 with 2 reed contacs uA723H maybe from ebay round about 3€ or ask me. Resistors from Digikey.... All other parts are quite normal.  
Digital control constant current source
runni
runni 2 days 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 2 days ago
hi joost, how to calibrate? thanks. regards, ervin
RF Power Meter with 1MHz-10GHz bandwidth and 55dB dynamic range