What are the alternatives to using transistors?

Relays: Normally closed relays are all you need to make any logic gate. Normally open relays are also useful. Mag-amps: Magnetic amplifiers could be used to make logic gates similarly to transistor-transistor logic.

Which type of signal is used when the transistor is used as a switch?

With a positive signal applied to the Base of the transistor it turns “ON” acting like a closed switch and maximum circuit current flows through the device.

How can I make a transistor?

Clicking on the text links will take you to the Glossary for more information about the term.

1. Start with p-doped silicon.
2. Grow thin silicon dioxide layer.
3. Deposit nitride layer.
4. Apply photoresist polymer.
5. Bring in mask.
6. Turn off regular light.
7. Expose to UV light.
8. Turn on regular light.

Which evolution era made use of the transistor or integrated circuits technology?

Transistor–transistor logic (TTL) was developed by James L. Buie in the early 1960s at TRW Inc. TTL became the dominant integrated circuit technology during the 1970s to early 1980s. Dozens of TTL integrated circuits were a standard method of construction for the processors of minicomputers and mainframe computers.

When a transistor is used as an amplifier?

To use a transistor as an amplifier, its input must be forward biased and output must be reversed biased. So, emitter-base junction must be forward biased and collector-base junction must be reverse biased.

How transistor behaves as a switch?

One of the most common uses for transistors in an electronic circuit is as simple switches. In short, a transistor conducts current across the collector-emitter path only when a voltage is applied to the base. When no base voltage is present, the switch is off. When base voltage is present, the switch is on.

Can you make a transistor out of diodes?

No, two diodes connected back to back cannot be used as a transistor. Joining two diodes will make the base size larger than the emitter and the collector. For a transistor, the size of the base must be the least. Moreover, the transistor is monolithic, it cannot be constructed by connecting two diodes.

What is the most common system used in the identification of transistors?

Bipolar junction transistors are the most commonly used type. To help identify them, transistors are labeled with number and letters on their casings. Transistors are labeled according to the numbering system that is used. The primary numbering systems are JIS, Pro Electron, and JEDEC.

What problem with transistors did the integrated circuit solve?

Although transistors did reduce the size and power consumption, they could not solve the problem of reliability of complex electronic devices. On the contrary, dense packing of components in small devices hindered their repair.

How did integrated circuits change computers?

In the 1950s, computers were massive devices that could barely hold a few megabytes. The incorporation of the integrated chip combined with other innovations allowed computers to shrink considerably in size while gaining in memory. Today, the IC is still a vital part of many different types of electronic devices.

How does BJT work as a switch?

BJT is either a PNP transistor or NPN transistor based on the doping type of the three terminals. The transistor acts as a switch in the cut-off mode and the saturation mode. The transistor is fully off in the cutoff region and fully on the saturation region.

What is BJT amplifier?

What is BJT? BJT (bipolar junction transistor) are widely used an amplifier, oscillator, switch etc. It is a current-driven device (MOSFET is voltage driven), the output current is equal to the input current times a factor which is called Gain. A basic BJT has three pins: the Base, Collector, and Emitter.