Hello, glad I could be of help. Indeed a 600VA inverter which consumes only 2VA, it is perfect, especially to supply such a small load. It all sounds a bit like a gas factory I guess, but it solves your problem and that's good. A few months ago, during a meeting ...

Hello Isentrop, Let's avoid mixing "thermistor, varistor and resistance". The diagram presented in your post uses a thermistor mounted as a divider bridge to be measured by a microcontroller. Its resistance varies greatly (NB: it is only linear on a ...

Hello, To confirm these last statements, the overcurrent of the departure is neither more nor less than the rise in temperature of the filament. As a reminder, the halogen lamp or any filament is a VDR, voltage dependent resistor. It is a nonlinear component, the measured curve that appears in ...

Hello Evaluation,
How would you measure the temperature with a bulb supplied with constant voltage?
Can you develop the principle?
Kind regards.
Pol

Beautiful experimentation! I like to find methodical handymen! The LEDs have a threshold voltage and a nominal current, beyond that the light produced increases, but in a lesser ratio. Arrived at a certain current, the LED heats up and loses efficiency, you have put your finger perfectly ...

Hello, a filament lamp is a resistor with a positive coefficient according to the voltage at its terminals (VDR). https://fr.wikipedia.org/wiki/Varistance Indeed, the more it heats the more its resistance increases. A diversion is made to convert this oddity into a hot wire anemometer. AT ...

Hello, is the problem still relevant in 2020? Containment allows you to spend time on such "details" ... I confirm that the use of a high impedance multimeter does not allow to read the real voltages at the terminals. Or take the precaution of putting u ...

Hello, This is not a ballast but a converter from 220VAC to (I suppose) 1000VAC at boot. the system is designed to be supplied with 220V, which itself after having been rectified and filtered becomes continuous 300V which is "chopped" at 37000 Hz to supply a transformer ...

Thank you Joe for this math work! Pol Here is a calculation which gives an idea of ​​the capacities of a solar system for watering: Capacités.xlsx Example: Parabola diameter 0,30 m Solar irradiation 1 kW.h / m² / year Optical efficiency 250% Thermal efficiency 80% Mechanical efficiency 50% Temperature i ...

Hello Joe, the subject is quite old, of course, but it is and will always be relevant. Where have you been since this study? Your Excel table is really practical and saves time in calculations. I saw that a serious installation had to have a large diameter sensor ...