| Electronics > Beginners |
| Are amplifier circuits like this still used/built? |
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| Doctorandus_P:
There is a group of people who extract satisfaction form building extremely simple Class A amplifiers. For example the attached picture from http://www.firstwatt.com/pdf/art_delite.pdf A good forum for circuits like this and other diy audio is... https://www.diyaudio.com/ |
| IanMacdonald:
As regards the mosfet amp, mosfets are not very linear when used like this, the gain rising rapidly with drain current. A BJT has the disadvantage of needing current drive, but current out is nearly proportional to current in. Speaking generally, there are far too many examples of digital circuits being used when analog circuits would actually work better. Pushbutton volume controls are one such. Absolute pain, especially when you hit that YT video with over-loud sound. :bullshit: |
| David Hess:
The only time I see disrete buffered shunt feedback circuits like that is where wideband performance is required with lower distortion (better linearity) than a transconductance amplifier will provide. The configuration shown is often seen in integrated amplifiers and audio amplifiers as the voltage gain stage with a Miller integrator replacing the shunt feedback so it is very common. |
| GregDunn:
--- Quote from: dzseki on February 23, 2019, 12:10:14 pm --- --- Quote from: jackthomson41 on February 22, 2019, 01:55:52 pm ---We can't deny a little importance of op amps but microcontrollers kind of revolutionized the electronics, so I don't think its that important now to learn basic things. Electronics is getting modern so you should dive with it and not stuck with basics. --- End quote --- Upon this post I am very tempted to build this circuit using "modern philosophy", let's see: I need an AD converter running at 1Msps, and two DA converters running at the same speed and an MCU, can you advise me the price of a suitable MCU? Using just two transistors is so old school... :clap: --- End quote --- Also, good luck troubleshooting anything (especially the 'vintage' test gear so popular on this site) without that basic knowledge of transistors. :-DD |
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