Tag Archives: 2N3904

Fuse Saver

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This circuit will be particularly useful to those hobbyists who use a ‘breadboard’ to try out ideas and who also use a simple ‘home-made’ DC power supply consisting of a transformer, rectifier, smoothing capacitor and protective fuse, that is, one without over current protection! In this circuit, the detecting element… Read more »

Very simple preamplifiers using 2N3904

Hi, Friends. Today I get email from Kunal Banerjee, send a preamplifier projects to published for all to see. It is very simple preamplifier circuit using one 2N3904 transistor only. Though very small, but it still have many useful. He say it low noise than normal IC circuits. and extremely… Read more »

Transistor regulator circuit can adjustable output voltage

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This circuit is maintain a constant voltage, the output voltage is adjustable.Serves to reduce the input voltage, and keep the voltage constant. The Q1 2N3904 is the amplifier model. common-emitter. This causes the voltage across the collector’s pin with the ground.Is equal to the voltage between the legs to the… Read more »

Transistor regulator circuit can adjustable output voltage

Schematic Diagrams      Comments Off on Transistor regulator circuit can adjustable output voltage

This circuit is maintain a constant voltage, the output voltage is adjustable.Serves to reduce the input voltage, and keep the voltage constant. The Q1 2N3904 is the amplifier model. common-emitter. This causes the voltage across the collector’s pin with the ground.Is equal to the voltage between the legs to the… Read more »

Circuit premic condenser into electrical signals

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Circuit Pre Mic Condenser Mic is bringing to change the sound to electrical signals.Then the electrical signal that is to expand the force was then sent out to the speakers. When raising the power supply 9-volt circuit and talking to the voices Microphone (MIC1) will change the sound to electrical… Read more »