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2SA564 PNP Audio Frequency Transistor - Datasheet
https://circuits-diy.com/2sa564-pnp-audio-frequency-transistor-datasheet/
2SA564 PNP Audio Frequency Transistor is designed for General amplifier application. Its Hybrid parameter forward current gain is High. Buy from Amazon.
Audio lectures from 1960: High-frequency transistors - EDN
https://www.edn.com/audio-lectures-from-1960-high-frequency-transistors/
Part 3 (September 1960): High-Speed Switching Transistors. In this installment, Simmons discusses the charge-control theory of high-frequency (for that day) transistors. He states that, contrary to what readers might think, “a transistor is not a current-controlled device, but rather is a charge-controlled device.”.
RF Transistors - LDMOS / DMOS - STMicroelectronics
https://www.st.com/en/radio-frequency-transistors.html
With more than 35 years’ experience, ST offers a broad portfolio of Radio Frequency power transistors operating from 7 to 100 V. They are a perfect fit for applications ranging from 1 MHz to 4 GHz, such as: Industrial, Scientific and Medical (ISM) FM and TV Broadcast; Mobile and wideband communications; Avionics and Radar
NTE121 Germanium PNP Transistor Audio Frequency Power ...
https://www.nteinc.com/specs/100to199/pdf/nte121.pdf
Germanium PNP Transistor Audio Frequency Power Amplifier Description: The NTE121 is a Germanium PNP Alloy Junction transistor in a TO3 type package designed as an audio frequency power output amplifier. Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Medium frequency transistors | Nexperia
https://www.nexperia.com/products/bipolar-transistors/special-feature-transistors/medium-frequency-transistors/
Medium frequency transistors. Ideal for all your tuning and amplification needs. Optimized for high transition frequencies, our bipolar medium frequency transistors give you high performance, miniature solutions. Parametric search.
Best sounding transistors - High-End Audio Discussion Forum
https://forum.audiogon.com/discussions/best-sounding-transistors
Regarding the sound aspects, perhaps they exist as with other components, but the design parameters such as the power supply, driver circuits, amount of feedback, etc probably have a much bigger impact. You very rarely hear of power transistor "rolling" as with tubes. rodman99999. Details. Discussions.
Let's try the 3 transistors Audio Amplifier circuits (MONO ...
https://www.eleccircuit.com/lets-try-the-3-transistors-audio-amplifier-circuits/
See in Figure 2 shows the Darlington transistor connection. We connect 2 transistors with exactly the same characteristics. According to the circuit characteristics as in the Figure. For example: Related: High impedance small amplifier circuits. AM radio receiver with 3 transistor amplifier circuit. This is another example of a simple Experiment 2.
Audio Oscillator | Discrete Semiconductor Circuits ...
https://www.allaboutcircuits.com/textbook/experiments/chpt-5/audio-oscillator/
PARTS AND MATERIALS. Three NPN transistors—models 2N2222 or 2N3403 recommended (Radio Shack catalog # 276-1617 is a package of fifteen NPN transistors ideal for this and other experiments) Two 0.1 µF capacitors (Radio Shack catalog # 272-135 or equivalent) Assortment of resistor pairs, less than 100 kΩ (ex: two 10 kΩ, two 5 kΩ, two 1 kΩ) One light-emitting diode …
Theory of Transistors - Vanderbilt University
https://www.vanderbilt.edu/AnS/physics/brau/H182/Theory%20of%20Transistors.pdf
3. TRANSISTORS AND TRANSISTOR CIRCUITS 3.1. Double junction 3.1.1. Emitter, collector and base In its essence, a transistor consists of two diodes arranged back to back: Transistors can be either n-p-n or p-n-p. The configuration shown above is called an n-p-n transistor. The terminal on the left is called the emitter, the terminal on the right is
Transistor Tutorial, Part 7: Oscillators
http://www.learningelectronics.net/VA3AVR/tutorial/xtor/xtor7/xtor7.html
A standard 465-KHz IF transformer (T1), intended for transistor circuits, is the LC resonant tank circuit in this oscillator. An audio-frequency AM signal fed to the emitter of Q1 through blocking capacitor C2 will modulate the supply voltage of Q1 and thus amplitude-modulate the circuit's 465-KHz carrier signal.
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