Showing posts with label transistors. Show all posts
Showing posts with label transistors. Show all posts
Tuesday, October 22, 2013
The pair of transistors power amplifier
Already Know about the transistor above? transistor above is one of the transistors that are applied at the amplifier end audio amplifiers. Because the power output and good quality of this transistor is very popular with high-power amplifier makers.
Transistors on no other than is 2SC2922 and 2SA1216, transistor pair is already very well known as a reliable amplifier. With a price not too expensive and not too large transistor large is also very suitable. And this transistor has its own code for its quality, its code is like 5DY, 57P, 85Y, 92P, etc.. to see datsheet transistor can be seen below.
Maximum Voltage 180V
maximum collector current 17A
Total power output 200W
To more clearly and accurately datasheet can be found here.
Thursday, October 17, 2013
The pair of transistors power amplifier
Already Know about the transistor above? transistor above is one of the transistors that are applied at the amplifier end audio amplifiers. Because the power output and good quality of this transistor is very popular with high-power amplifier makers.
Transistors on no other than is 2SC2922 and 2SA1216, transistor pair is already very well known as a reliable amplifier. With a price not too expensive and not too large transistor large is also very suitable. And this transistor has its own code for its quality, its code is like 5DY, 57P, 85Y, 92P, etc.. to see datsheet transistor can be seen below.
Maximum Voltage 180V
maximum collector current 17A
Total power output 200W
To more clearly and accurately datasheet can be found here.
Thursday, September 19, 2013
Build an op amp with three Discrete Transistors
You can use three discrete transistors to build an operational amplifier with an open-loop gain greater than 1 million (Figure 1). You bias the output at approximately one-half the supply voltage using the combined voltage drops across zener diode D1, the emitter-base voltage of input transistor Q1, and the 1V drop across 1-MΩ feed-back resistor R2.
Resistor R3 and capacitor C1 form a compensation network that prevents the circuit from oscillating. The values in the figure still provide a good square-wave response. The ratio of R2 to R1 determines the inverting gain, which is −10 in this example.
You can configure this op amp as an active filter or as an oscillator. It drives a load of 1 kΩ. The square-wave response is good at 10 kHz, and the output reduces by 3 dB at 50 kHz. Set the 50-Hz low-frequency response with the values of the input and the output capacitors. You can raise the high-frequency response by using faster transistors and doing careful layout. Link
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| Figure 1. | This ac-coupled inverting op amp has an open-loop gain of 1 million. R1 and R2 set a closed-loop gain of −10. |
Resistor R3 and capacitor C1 form a compensation network that prevents the circuit from oscillating. The values in the figure still provide a good square-wave response. The ratio of R2 to R1 determines the inverting gain, which is −10 in this example.
You can configure this op amp as an active filter or as an oscillator. It drives a load of 1 kΩ. The square-wave response is good at 10 kHz, and the output reduces by 3 dB at 50 kHz. Set the 50-Hz low-frequency response with the values of the input and the output capacitors. You can raise the high-frequency response by using faster transistors and doing careful layout. Link
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