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Transistor - Wikipedia

Een transistor (samentrekking v. Eng. transfer en resistor, = lett.: overdrachtsweerstand) is een elektronisch onderdeel dat onder meer als versterkend of schakelend element in een elektronische schakeling kan dienen. Een transistor bestaat uit een kristal van een halfgeleider in een afgesloten omhulling van metaal of kunststof. Symbool. Er zijn in het algemeen drie aansluitingen : de emitter ...

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Why is germanium considered better than …

As has been said already, the BE voltage of germanium transistors is about 0.2 to 0.3 Volts whereas that of silicium is about 0.6 to 0.7 Volts. But that has not much to do with the cross over ...

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Armstrong - Reviews and Recollections: The …

This page looks at the 'Germanium Transistor Era' and covers the 400 and 500 ranges which used germanium transistors in the output stages of their power amplifier sections. Note that all the magazines and books referred to below were United Kingdom publications unless otherwise specified. In some cases I don't know the exact date of publication because I only have a reprint that omits ...

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Radio Frequency Schematics

All circuits are listed alphabetically on the Circuit Index page and in date order on the update page. All contributors are listed on the credits page. If you have problems try my help page first. Most circuits on this site use SI Notation. Due to large volumes of email, I regret that I can only answer questions about circuits on my site.

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transistor | Definition & Uses | Britannica

Transistor, semiconductor device for amplifying, controlling, and generating electrical signals. Transistors are the active components of integrated circuits, or "microchips," which often contain billions of these minuscule devices etched into their shiny surfaces.Deeply embedded in almost everything electronic, transistors have become the nerve cells of the Information Age.

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P517/617 Lec5, P1 Diodes and Transistors

P517/617 Lec 5, P7 Transistors • Transistors are the heart of modern electronics (replaced vacuum tubes) voltage and current amplifier circuits high frequency switching (computers) impedance matching low power small size, can pack thousands of transistors in mm2 • In this class we will only consider bipolar transistors. Bipolar transistors have 3 leads:

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Armstrong - Reviews and Recollections: The …

This page looks at the 'Germanium Transistor Era' and covers the 400 and 500 ranges which used germanium transistors in the output stages of their power amplifier sections. Note that all the magazines and books referred to below were United Kingdom publications unless otherwise specified. In some cases I don't know the exact date of publication because I only have a reprint that omits ...

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Experiment: Transistor Circuit Design - Backyard …

Experiment: Transistor Circuit Design. You can now explain with confidence what p-doping, n-doping, and depletion layers mean. Now you will put that knowledge to use. You have the transistor in your hand. You stare at it, knowing the power it contains and what it has done for the world. Here you will use your transistor …

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Why Silicon is preferred over Germanium ? - …

The disadvantage of silicon as compared to germanium is that potential barrier of silicon diode (0.7V) is more than that of germanium diode (0.5V). This means that higher bias voltage is required to cause current flow in a silicon diode circuit. This drawback of silicon goes to the background in view of the other advantages of silicon mentioned above. Consequently, the modern trend is to use ...

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Diode–transistor logic - Wikipedia

Diode–transistor logic (DTL) is a class of digital circuits that is the direct ancestor of transistor–transistor logic.It is called so because the logic gating function (e.g., AND) is performed by a diode network and the amplifying function is performed by a transistor (in contrast with RTL and TTL

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Transistor - Wikipedia

Een transistor (samentrekking v. Eng. transfer en resistor, = lett.: overdrachtsweerstand) is een elektronisch onderdeel dat onder meer als versterkend of schakelend element in een elektronische schakeling kan dienen. Een transistor bestaat uit een kristal van een halfgeleider in een afgesloten omhulling van metaal of kunststof. Symbool. Er zijn in het algemeen drie aansluitingen : de emitter ...

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Psu Germanium Transistor Replacement

Aug 07, 2017 Yes the germanium transistors have some undesirable qualities, but they can allow starting a boost converter even at 0.5 volts. Once the converter starts, the germanium transistor is no longer needed so it goes back to working on silicon. Does it matter if I replace germanium transistors with. Well, for starters germanium transistors have the opposite polarity from most common ...

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Psu Germanium Transistor Replacement

Aug 07, 2017 Yes the germanium transistors have some undesirable qualities, but they can allow starting a boost converter even at 0.5 volts. Once the converter starts, the germanium transistor is no longer needed so it goes back to working on silicon. Does it matter if I replace germanium transistors with. Well, for starters germanium transistors have the opposite polarity from most common ...

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Substitution of old germanium transistors in …

13.07.2013· Re: Substitution of old germanium transistors in radio circuits It's also worth remembering that when that kind of circuit was popular, it was rare to find Ge transistors with an fT of more than a few MHz, some were less than 1MHz.

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Why Silicon is preferred over Germanium ? - …

The disadvantage of silicon as compared to germanium is that potential barrier of silicon diode (0.7V) is more than that of germanium diode (0.5V). This means that higher bias voltage is required to cause current flow in a silicon diode circuit. This drawback of silicon goes to the background in view of the other advantages of silicon mentioned above. Consequently, the modern trend is to use ...

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Diodes and Transistors - University of California, Berkeley

Diodes and Transistors 1. Introduction So far in EE100 you have seen analog circuits. You started with simple resistive circuits, then dynamical systems (circuits with capacitors and inductors) and then op-amps. Then you learned how circuit elements do not operate the same at all frequencies.

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worldradio: Substitutes for AF117 Germanium …

AS many members will know, AF117 and similar transistors such as AF115,116, and OC170/171 were used in a great many British made radios of the 1960s & early 70s. Due to the method of construction employed in the manufacture of these transistors, together with the fact that they are now between about 45 and 55 years old, they are prone to developing internal leaks or short circuits between one ...

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What is the function of a transistor in an …

As Mr. Redding said, transistors have many uses, and many of them can be lumped together in the category of power gain. He also noted that they tend to have considerable variability in their terminal characteristics. When I started in electronics,...

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Design of a Single Transistor Amplifier

CIRCUITS LABORATORY EXPERIMENT 7 Design of a Single Transistor Amplifier 7.1 OBJECTIVES The objectives of this laboratory are to: (a) Gain experience in the analysis and design of an elementary, single transistor amplifier, (b) Build and thoroughly test the amplifier, (c) Make a careful comparison between the amplifier's design specifications and the experimental measurements with corrective ...

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What is the function of a transistor in an …

As Mr. Redding said, transistors have many uses, and many of them can be lumped together in the category of power gain. He also noted that they tend to have considerable variability in their terminal characteristics. When I started in electronics,...

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worldradio: Substitutes for AF117 Germanium …

AS many members will know, AF117 and similar transistors such as AF115,116, and OC170/171 were used in a great many British made radios of the 1960s & early 70s. Due to the method of construction employed in the manufacture of these transistors, together with the fact that they are now between about 45 and 55 years old, they are prone to developing internal leaks or short circuits between one ...

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