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TonGiesberts
TonGiesberts il y a 7 heures
This part of the circuit is in principle not any different from other oscillators. Part of the output signal is coupled back to the input of the driver. If the gain is sufficient it will cause oscillation at whatever frequency the circuit is tuned to. The current through R28 is the same as is flowing through the air (the discharges) and returns through parasitic capacitances to the mains and the AC adapter and thus ground of the circuit. At 4 MHz these capacitances can be small. Since the current is very low voltage drops, compared to 30 kV, are negligible.    
Spiral MicroTesla, USB powered [160498]
TonGiesberts
TonGiesberts il y a 8 heures
It’s possible to change the installation of  Volumio 1.55 to have the main menu item ‘Turn off visible when the rotatiion of the display is normal. It’s much like changing the zoom level of Midori in the RuneAudio project update. All it takes is to change the command line that opens Midori in Autostart:   In ~/.config/lxsession/LXDE-pi/autostart change the line  midori -e Fullscreen -a http://localhost   to  midori -e Fullscreen & ZoomOut & ZoomOut -a http://localhost   It will make Midori zoom out twice. Once would be enough but the button Turn off isn’t completely visible then and maybe an option if some letters are getting to small. The photograph shows the result with zoom out twice.  
Audio DAC for RPi - Networked Audio Player using Volumio [160198]
Mansueto Grech
Mansueto Grech il y a 1 jour
Hi Joost, Unit assembled an working Fine. I have a question If I may. Is it possible to substitute the pre defined  power calibration  with new Frequencies. As I would like it to be calibrated on the Ham Bands and mainly 144, 432, 1296 2304 5700Mhz. and possibly 10Ghz. Thank you in advance  regards Mans.
RF Power Meter with 1MHz-10GHz bandwidth and 55dB dynamic range
mwmuc
mwmuc il y a 2 jours
Cables are always an issue. In this application I need four wires: GND, VDD (+5V), Data A and Data B. I thought standard USB cables would be interesting because they are easy to get and very cheap. My prototype has a connector with two USB sockets so the bus can be passed through to the next controller.
Application for Viessmann model railway signals
mwmuc
mwmuc il y a 2 jours
In this application I chose to put the configuration of the signal controller into hardware. Resistors are used to set analog inputs of the microcontroller to defined voltages with 8 possible levels for each input. That way no download and storage into EEPROM of the address of the individual controller is necessary. The controller reads theanalog inputs at startup to learn what signal type it is controlling: Vorsignal Blocksignal Einfahrsignal Ausfahrsignal Blocksignal mit Vorsignal Einfahrsignal mit Vorsignal Ausfahrsignal mit Vorsignal Gleisssperrsignal Sorry I do not know the English terms! It is about different types of signals! Two more analog inputs are used to define the address of the controller (64 address is the limit).
Application for Viessmann model railway signals