How to Make an Audio Mixer Using a Single Transistor

An audio mixer is an essential device in audio electronics. A mixer mixes two or more audio signals into one (mono) or two outputs (stereo). Audio mixers use an audio mixing process to combine multiple sounds into single or multiple sounds. It is a widely used process in live concerts, television, movies, the music industry, […]

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Building an Audio Preamplifier Circuit

Many times we need to control the bass, treble and volume of the audio signal before passing through the amplifier stage to prevent sound distortion. The circuit that amplifies the audio signal before it enters the main speaker amplifier is called an audio preamplifier. Using an audio preamp ensures good audio quality and provides the […]

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How to measure NPN type triode with pointer multimeter?

There are digital multimeter and pointer multimeter, both of which can measure. I will demonstrate the measurement methods one by one. 1. Digital multimeter measurement When using a digital multimeter to measure, the “diode gear” is used for measurement. The red probe is equivalent to the positive pole of the battery, and the black probe […]

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How to distinguish between NPN sensor and PNP sensor

There are NPN and PNP triodes. When different types of triodes are used to drive the output of the sensor, there are NPN and PNP sensors. No matter what the output is, as long as a loop is formed, the inversion signal can be triggered. Moreover, some parts cannot be used mutually. For example, Mitsubishi […]

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What is the difference between PNP and NPN

   preface NPN and PNP of photoelectric switch refer to different output levels of photoelectric switch. The difference between NPN type and PNP type photoelectric switch sensor lies in different output levels. NPN outputs low level while PNP outputs high level. The type of photoelectric switch is a very professional technical problem. Please answer it in […]

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What is the difference between the two basic applications of triode?

The function of triode The diode controls the flow direction of electrons in the wire, while the triode controls the number of electrons flowing in the wire. The invention of triode In order to control the current in a wire, we must first disconnect the wire. The two ends of the disconnection are called C-terminal […]

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Connection mode of NPN PNP sensor and PLC

How to connect PNP and NPN sensors with PLC? Novices will encounter this problem when they are getting into PLC wiring problems. When looking for relevant information, they will sometimes find more and more chaotic. Do you have this feeling? I believe you will have this feeling when you just start. So how to distinguish […]

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Various types and principle analysis of PNP and NPN sensors

PNP and NPN sensors use the saturation and cut-off of triode to output two states, which belong to switch sensors. But the output signal is the opposite, that is, high level and low level. PNP output is high level 1, NPN output is low level 0. PNP and NPN sensors (switch type) are divided into […]

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