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Compact Data Logger

Compact Data Logger: Compact Data Logger - A typical unit provides 60 channels of data in a 20 x 40 x 60 cm box weighing about 20 kg. Most manufacturers…

What are Passive Filters?: Passive filters are mainly networks using inductors, capacitors and resistors. The classical theory employed was based on the image parameter theory which in turn was based…

Synchronous Vibrator and Synchronous Chopper

Synchronous Vibrator and Synchronous Chopper: Low dc current may be transformed into a high voltage dc by simple chopper action. Although an inductive type transformation process is required, the output…

Transistor Chopper Circuit

Transistor Chopper Circuit: Transistor Chopper Circuit - A single transistor used as a dynamic switch to convert low level dc signal to an ac waveform is shown in Fig. 14.34.…

Diode Bridge Type Modulator with Transformer Coupling

Diode Bridge Type Modulator with Transformer Coupling: Diode Bridge Type Modulator - Figure 14.33 shows a silicon diode ring modulator with an associated ac coupled dc amplifier. The amplifier itself…

Magnetic Modulator

Magnetic Modulator: The most reliable substitutes for electromechanical choppers are magnetic modulators. These devices reach a null stability as low as 10 μV, but their response time is often less…

Self Oscillating Converter (Transistorized Chopper Circuit)

Self Oscillating Converter (Transistorized Chopper Circuit): Self Oscillating Converter (Transistorized Chopper Circuit) - A Transistorized dc to ac converter suitable for low level dc signal is illustrated in Fig. 14.30.…

What is Electromechanical Chopper?

What is Electromechanical Chopper?: Electromechanical Chopper - An ac amplifier must see ac in order to perform useful work. A fair number of chopping and modulation techniques are available to…