24 เมษายน 2567 [1]

Hum problems in your homebrew audio amplifier? This could be interesting (3 out of 6 reasons ) VLOG

Please read the description for more info about (problematic) “hum” in audio amps. This video regards only three out of six causes of hum in your homebrew (or whatever) audio amplifier: 1. Hum due to a low quality power supply, that is not able to suppress the hum out of the “mains” (110V/230V AC at 50 Hz or 60 Hz) in a proper way. Can be easily repaired by a so called “Miller” circuit = extreme hum suppressor, Video about that extreme hum suppressor (also used here in this amp. u0026 this video ) is here: [ 🔗 Click ‼️ ] 2. Hum due to not proper shielding of sensitive audio input circuits (normally in the 0,3 V AC to 0.8 V AC input level), going to the first transistor of the end-amp or pre-amp (audio) 3. Hum that can be very easily suppressed to say zero, by adapting a (too) sensitive audio amplifier (homebrew or not) with a good quality potentiometer or resistor combination, bringing the input impedance down. Here (demo) it is a 25 K potmeter, could be 50 K. An amplifier with (say) an input impedance of 1 Mega Ohm, is, in general, sensitive to e.m. “hum.” Dropping the input sensitivity to values in the order of 1K - 50 K helps a lot to diminish the “hum”. Of course (could be ) that you need a 1 transistor pre-amp in that case, to drive that high-impedance end-amp with a low impedance pre-amp, able to take up any sources: MP3 player, CD player, microphone, etc. Many video’s about e.m. shielding etc. are on my YT Channel, you can find them via the “looking glass” on my Channel trailer, via keywords like “shielding”, “hum”, audio , pre amp , suppression , filter , etc. The 8-10 Watt audio amplifier where it is all about is here: [ 🔗 Click ‼️ ] Give the BD 139 in this audio amp. a big heatsink! It gets hot, and I don t know why, though I have an idea. Anyway: such a big heatsink protects the BD 139 (and thus the whole audio amp) from self destruction. With a good heatsink the . :::: Visit my YouTube channel @ radiofun232 ( [ 🔗 Click ‼️ ] )

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