is adjusted in such way that will produce an audible oscillation of both freqs.Thru N4, the signal from the variable osc. The second oscillator is with N3 and a LC combination. The oscillator is built with NAND N1 and a ceramic filter of intermediary freq. The metal detector circuit is built with CD4011. When one of the oscillators become unstable then the frenquency of the interference will be modified. The working principle of this cheap and easy to build metal detector circuit consists in mixing two equal frequencies which causes a low-frequency interference. Published:9 21:42:00 Author:Ecco | Keyword: Cheap, Metal Detector
#LED CLIPPING DETECTOR FULL#
View full Circuit Diagram | Comments | Reading(2718) Cheap Metal Detector circuit Each added input must be series limited by the 33K resistor. Additional input lines can be connected to the emitter line. At 15 volts power supply, the input resistors should be 33K. Using the values in the audio mixer circuit shown in the diagram, the collector current will be about 1 mA. This one transistor audio mixer is used in an amplifier circuit design with base driven transistor and with its emitter being current controlled, most of the driving current flows through the collector away.
Published:0 20:59:00 Author:Ecco | Keyword: Audio Mixer, one transistor
View full Circuit Diagram | Comments | Reading(1124) Audio Mixer with one transistor The power supply can also be obtained from higher voltage rails provided suitable R/C cells are inserted. Obviously, the unit can be embedded into an existing mixer, preamp or power amplifier, and powered by the internal supply rails in the 9 – 30V range.
#LED CLIPPING DETECTOR GENERATOR#
Unfortunately, an oscilloscope and a sine wave frequency generator are required to accurately setup this circuit. A careful setting of Trimmer R5 will allow triggering of the LED with a wide range of peak-to-peak input voltages, in order to suit different requirements. This will help the operator in preventing severe, audible distortion to be generated through the audio equipment chain.This unit is particularly useful in signaling overload of the input stages in mixers, PA or musical instruments amplification chains, but is also suited to power amplifiers. is reaching the onset of its maximum permitted peak-to-peak voltage value before an overload is occurring. and can be used as a separate, portable unit, to signal by means of a LED when the output wave form of a particular audio stage is “clipping” i.e. This Audio Clipping Indicator circuit was intended to detect clipping in preamp stages, mixers, amplifiers etc. Published:6 21:18:00 Author:muriel | Keyword: Audio Clipping, Indicator
0 kommentar(er)
