Just need a little transistor!!!Hey,
i´m looking for an amp to drive a 0.3 watt 50 ohm speaker.
can i connect a 0.3 watt 50 ohm speaker to macbook pro 2021 audio out 3,5mm?
Best,
D
the peak power is 0.5 watts ( max duration 1 min.). and it has a 85dB at 3kHz at maximum.Just need a little transistor!!!
Depending on the transistor, It'll wire up in a slightly different way correctly.the peak power is 0.5 watts ( max duration 1 min.). and it has a 85dB at 3kHz at maximum.
to drive that speaker to the max, what is the amplification factor? or what is the formula ? ^^
this is what i would follow
https://www.instructables.com/Simple-Audio-Amplifier-Using-Single-Transistor/
unfortunately i cant change the speaker.0.3W into 50 ohms is 3.9V RMS which is 11V peak-to-peak. An audio amplifier powered from 14V or 15V can do it.
A 50 ohms speaker usually sounds awful and is used for a gas station intercom.
The single transistor Instructable amplifier produces severe distortion and puts DC in the speaker to make it sound worse.
so then you calculated: 0,3w * 50ohm = sqrt(15)volt --> ca. 3,872 volt0.3W into 50 ohms is 3.9V RMS which is 11V peak-to-peak.
I have a irf540n transistor, to reach the 11 peak to peak voltage ... what circuit would you recommend me?Depending on the transistor, It'll wire up in a slightly different way correctly.
i guess this amp is too low in power, is it?Hello,
Perhaps this amplifier might please you:
https://www.amazon.de/Headphone-Amplifier-Amplifying-Smartphones-Headphones/dp/B07NPTJQ45/ref=sr_1_18_sspa?crid=9LWDXI2VN769&keywords=kopfhörerverstärker&qid=1656178201&sprefix=headphone+a,aps,157&sr=8-18-spons&psc=1&smid=AEB9F56C3A3O6&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExU1VDVVhNWjhNT08mZW5jcnlwdGVkSWQ9QTAwNDk3OTAyME9TWTBDTzI1MVgwJmVuY3J5cHRlZEFkSWQ9QTAyNTQ0NzYzMkROR1c4TUo1STEwJndpZGdldE5hbWU9c3BfYnRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==
Bertus
specs in the picture attached.The supply voltage for the headphones amplifier is too low to produce 0.3W into 50 ohms. It produces 0.27W into 32 ohms which is 2.94V RMS (8,3V p-p, probably bridged outputs). 2.94V squared/50 ohms= 0.173W.
Please provide a link to your 50 ohms speaker specs and its enclosure.
I also ordered already a speaker yesterdayThe supply voltage for the headphones amplifier is too low to produce 0.3W into 50 ohms. It produces 0.27W into 32 ohms which is 2.94V RMS (8,3V p-p, probably bridged outputs). 2.94V squared/50 ohms= 0.173W.
thats ok for my use case. i have to make and test some sounds for that speaker and just need to make sure that the amp drives the speaker properly and not kills it ^^Hello,
Did you see that the amplifier needs USB 1.0 or USB 2.0 input signals?
despite that i bought a speaker for testing i am interested in how to put it together with the correct componentsThe supply voltage for the headphones amplifier is too low to produce 0.3W into 50 ohms. It produces 0.27W into 32 ohms which is 2.94V RMS (8,3V p-p, probably bridged outputs). 2.94V squared/50 ohms= 0.173W.
Please provide a link to your 50 ohms speaker specs and its enclosure.
Not likely. If it can produce 320mW into 32Ω it can produce 320 * 32 / 50 = 205 mW into your speaker.thats ok for my use case. i have to make and test some sounds for that speaker and just need to make sure that the amp drives the speaker properly and not kills it ^^
would it be fine in terms of levels? i still have the question as above :
"With up to 320 milliwatts of power (recommended from 16 to 150 ohm impedance)"
does it keeps up the 320mW with 50 ohm?