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NTE123AP NPN Audio Amplifier Transistor - …
https://components101.com/transistors/nte123ap-npn-audio-amplifier-transistor
Complementary PNP of NTE123AP: NTE159 . Brief Description on NTE123AP. The NTE123AP is a NPN Audio Amplifier transistor with a maximum gain of 300. The transistor also has a good collector current value of 600mA and can be toggled with a base voltage of only 6V making it suitable for switching applications.
Two Transistor Amplifier Circuit - Electronics Notes
https://www.electronics-notes.com/articles/analogue_circuits/transistor/amplifier-npn-pnp-two-transistor-circuit.php
This electronic circuit design shows a simple two transistor amplifier with feedback to offer a defined gain level that can be determined by the resistors in the circuit. The design includes PNP and NPN transistors and adopts the overall topology of the Sziklai pair, but with additional resistors included to define the gain.
differential amp - pnp or npn | diyAudio
https://www.diyaudio.com/community/threads/differential-amp-pnp-or-npn.92886/
Sometimes the reason for selecting npn or pnp transistors is based on bias conditions for the desired load and the following stage. For example, if the input voltages of the differential amplifier are near ground, and the outputs of that stage need to be close to the positive power supply, then an npn differential pair would be the choice.
What transistors do I need to use for a sound amplifier ...
https://www.quora.com/What-transistors-do-I-need-to-use-for-a-sound-amplifier-the-NPN-or-the-PNP-type
Modern amplifiers employ both, for a symmetrical, class B output. Most amplifiers are now built around integrated circuits, which employ NPN and PNP transistor types inside them. Earlier amplifiers used to employ PNP transistors only, because good NPN transistors were not available in the germanium golden days.
The Single NPN Transistor Audio Preamp - HACK A WEEK
http://hackaweek.com/hacks/the-single-npn-transistor-audio-preamp/
This common emitter amplifier configuration using an NPN transistor has many applications but is commonly used in audio circuits such as pre-amplifier and power amplifier stages. I powered this circuit with a single 3V coin battery I salvaged from an old computer motherboard. It works just fine at this low voltage because it’s just a preamp.
Best transistor to use for audio amplifier - Electrical ...
https://electronics.stackexchange.com/questions/97827/best-transistor-to-use-for-audio-amplifier
You could successfully build a audio amp from many different types of BJTs. It will be the circuit, not the transistor, that makes the amp work well. I'd pick jellybean parts like the 2N4401 (NPN) and 2N4403 (PNP) and stick with them for everything except for the final power output transistors. Lots of parts could fill that role.
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