LeoDJ, 1 month ago to MemeryAlpha

Latest project in the category "Is it actually useful or just an elaborate #shitpost?": #USB2Speakon!

It's a fully self-contained, USB-C-powered, 2-channel DAC + 5W Class-D amplifier inside a #Speakon connector.

Use it to connect your phone / laptop to any passive loudspeaker and enjoy surprisingly loud music (probably enough to host a room party)

(GitHub link for the interested: https://github.com/RainbowLabsDE/USB2Speakon )

#usbc #dac #audio #amplifier #stagetech

A USB A->C cable plugged into the USB2Speakon. It also works like that. But it just looks wrong :D
The USB2Speakon plugged into the back of a subwoofer with pass-through and a connected yellow USB-C cable leaving the image.
The finished test setup. A loudspeaker on top of a subwoofer to which the USB2Speakon is connected. A Framework laptop is connected to the other end, providing the power and audio signal. There is nothing else connected to the speakers other than the USB2Speakon and laptop.

janbeta, 6 months ago (edited 6 months ago) to VintageAudio

New video! I'm repairing a Sony TA-F550ES amplifier from the early 1990s that suffered from some intermittent sound issues. YouTube: https://youtu.be/o3FykCRHAK4 PeerTube: https://makertube.net/w/6vSfkpv8ooSKpJXSJtwACU #VintageAudio #Sony #Repair #Hifi #Amplifier #Troubleshooting

itnewsbot, 7 months ago to random

Flipped Transformer Powers Budget-Friendly Vacuum Tube Amp - If you’ve ever wondered why something like a radio or a TV could command a hefty f... - https://hackaday.com/2023/11/07/flipped-transformer-powers-budget-friendly-vacuum-tube-amp/ #classichacks #transformer #vacuumtube #amplifier #isolation #secondary #filament #primary #parts #power #valve

H4ND, 9 months ago to guitar

I got a tiny guitar amp for living-room practice. Pint glass for scale. It's a "Mooer Hornet 05i"

So far so good. You control all the tones and effects from an app. Has a surprisingly good sound despite its size.

#guitar #amplifier #mooer #musodon #mooeraudio

Ethancdavenport, 11 months ago to Help

hey y'all. i'm looking for some #help putting together a new #hifi setup. last week i acquired an #Aiwa brand #turntable and three matching #speakers, and i'd really like to find a matching #amplifier, but so far my search results have been suboptimal.

my turntable is an Aiwa PX-E860, and i have one Aiwa SX-C605 center speaker and 2 Aiwa SX-R275 stereo speakers. the turntable has a 2001 manufacture date, so i'm betting the speakers are about the same since i found them all in the same place.

i can't find a product catalogue or anything from around that time, so i'm truly at a loss as to what model of amplifier i should be looking for.

boosts appreciated! thanks for reading.

bornach, 1 year ago to Electronics

Testing the switching characteristics of cheapo PC817 optocouplers from Ebay.
555 timer astable is generating a 37kHz square wave test input.
Rise/fall time is way out of spec for use in #MIDI. But the recommended component, 6N138, is much more expensive.

Instead have the #optocoupler drive the base of an NPN #transistor and by adding appropriate resistors, I get much improved switching speeds. Is this good enough for a MIDI input circuit? #electronics #oscilloscope #breadboard

Oscilloscope shows the 555 timer output as a yellow square wave, and the optocoupler collector-emitter voltage as a blue waveform that is anything but square. At 37kHz the output signal is clearly not usable
The oscilloscope is now hooked up the the collector of the NPN transistor whose base is driven by the 2nd optocoupler. The blue waveform is a near perfect square wave, with rise/fall times well within 2us spec for a MIDI application.