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Constant Current Sources for Audio Amplifiers
https://nathaliebeimler.com/tech/audio_amplifier_current_source_comparison.html
Constant current sources for audio amplifiers Abstract. Constant current sources are basic building blocks of almost every analog audio amplifier. There are countless circuits and each has its own unique properties. In this article I will compare a small selection of different variants with each other in order to identify their advantages. I will use the best ones for my next audio …
Audio Amplifier Fundamentals - Part 1 What is Constant ...
https://www.prosoundtraining.com/2017/12/01/audio-amplifier-constant-voltage/
In this series I will present some universal fundamentals concerning audio amplifier performance, concluding with a rating method that allows meaningful performance assessments and model-to-model comparisons. Hint: Part 5 includes a brief overview of Parts 1-4. If you are in a hurry, just skip to Part 5 to get the big picture.
Current Source Amplifiers and Sensitive / Full-Range Drivers
https://www.passdiy.com/pdf/cs-amps-speakers.pdf
We built an audio current source that delivered 1 amp of AC current per input volt to a maximum of 10 amps. This kind of amplifier is known as a power transconductance amplifier. Such circuits are fairly common in small chips which don’t generate the high current necessary to drive a …
Constant Current for Tube Heaters. Extend the Life of Your ...
https://audioxpress.com/article/constant-current-for-heater-tubes-extend-the-life-of-your-amplifier-s-vacuum-tubes
Constant voltage (rather than constant current) is the most common vacuum tube heater drive technique. Power transformers for tube amplifiers are commonly made with 6.3-V or 12.6-V windings to drive the amplifier’s tube heaters in parallel. Powering heaters with a constant current can require an inconvenient voltage level.
a dream...real audio current amplifier.... | diyAudio
https://www.diyaudio.com/community/threads/a-dream-real-audio-current-amplifier.111106/
The gain will be 16 on a load of 8 ohm with a constant current of 2Ampere with 1 volt input. 32 Watts on the load and 2 watt on the resistor. With an input of 3 volts (very high input) The gain will be 16 on a load of 8 ohm with a constant current of 6Ampere.
The talk of current amplifier vs voltage in audio ...
https://electronics.stackexchange.com/questions/226401/the-talk-of-current-amplifier-vs-voltage-in-audio
Unfortunately loudspeaker impedance is usually not very constant, it is frequency dependant. So in theory current steering might be "better". The fact remains that it is impractical, a current output amplifier would apply the maximum voltage it can deliver (it would clip !!!) when no speaker is connected or the speaker's impedance becomes too high.
Constant Current Source (CCS) For Audio Applications ...
https://www.diyaudio.com/community/threads/constant-current-source-ccs-for-audio-applications.294771/
D. Talukdar et al. A low noise constant current source used for measuring the 1/f noise in disordered systems in ohmic as well as non-ohmic regime is described. The source can supply low noise constant current starting from as low as 1 μA to a few tens of mA with a high voltage compliance limit of around 20 Volts.
LM317 as a Constant Current Source in audio cirсuitry ...
https://myelectrons.com/lm317-as-a-constant-current-source-in-audio-cirsuitry/
Reference Constant Current Source for DIY Audio and beyond (and anything else that requires the really good CCS :)) - I have this project under development. The "magic" CCS promises to have quite outstanding parameters: I nominal as from tens of micro-Amperes up to 400 mA (subject to some 50W power limit)
Electronics I Audio Amplifier Design Project
https://jahschwa.com/file/school/audio-amp.pdf
The input stage to this amplifier has 3 main parts: a differential BJT pair, a current mirror BJT pair, and a constant current source. Connected to the bases of the BJTs in the differential pair are the input signal and the negative feedback coming from the output. The differential pair generates an error signal that drives the output.
Audiogon Discussion Forum
https://forum.audiogon.com/discussions/voltage-source-vs-current-source-amplifiers
A current source amp is an amplifier whose output impedance is significantly higher than that of the load and so makes constant current regardless of load. This is not a tube or solid state amp in particular; to achieve this, the amp must employ current feedback, which is a bit different from voltage (traditional) feedback.
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