Its a sparetime project so lets see how long tiem it takes before I implement that. To counteract mould growth in a cupboard Ive installed a small peltier based dehumidifier. Next I plan on making a OLED display on this design with an arduino controller. That would peg a mechanical instrument if you would at the same time want to be able to detect a significantly lower RF-current without having to change scales with switches / pot meters etc. Since it has a log output the dynamic range from milliamp range up to 1,4A RF current.
EEVBLOG CLIPPING DETECTOR GENERATOR
I calibrated the instrument by terminating the generator in a fancooled 100W dummy load and measured the voltage over the load by an oscilloscope. The ferrite core is a split type and is epoxied to a clip. Browse our top selling metal detectors for sale today Save Money and Find the Best Metal Detector for Hobby, Security, Industrial, and. We offer the largest selection and best deals on metal detectors - guaranteed. (Apart from capacitive coupling and a slight leakage inductance from the current transformer windings/ferrite combination). Kellyco Metal Detectors has provided customers worldwide with the best metal detectors and accessories for over 65 years. The Op-amp comparator compares one analogue voltage level with another analogue voltage level, or some preset reference voltage, V REF and produces. Without the peak detector then this kind of short duration clipping will appear dim or not seen. A peak detector will stretch the short duration first sound from a piano key that is producing clipping long enough for the LED to be bright. Therefore I made a new rf-amperemeter design with a log detector chip from Analog Devices driven from a current transformer made out of a split core ferrite material that has response in the HF and lower VHF frequency range.The current trafo is terminated in a few ohms and the RF current conductor (actually the primary) sees only a fraction of an ohm so very little influence is done on the circuit you are measuring. The comparator is an electronic decision making circuit that makes use of an operational amplifiers very high gain in its open-loop state, that is, there is no feedback resistor. When there is a difference then it is caused by distortion which is clipping in a low distortion amplifier.
However the dynamic range is very limited with such a setup. This can be done by a rf-current transformer and a rectifier made by a shottky diode or fast silicon diode and an integrator driving a mechanical instrument. I have long had the need to measure antenna current.
0 kommentar(er)
