Fixing an Onkyo Receiver with Multiple Faults
https://fed.brid.gy/r/https://hackaday.com/2026/03/07/fixing-an-onkyo-receiver-with-multiple-faults/
I had a cheap audio amplifier from AliExpress, a few speakers pulled out of an old TV, a chunk of USB cable, a cardboard box, and half an hour. Looks like I made something! Audio quality isn’t the best, but it will run on a 5V/1A USB power supply and I can plug a radio into it instead of using headphones.
Front view of a large TV speaker built into the front of a cardboard box and a smaller speaker built into the top. The speakers are held in place with zip ties. There is a black volume control knob to the right of the front speaker. A blue-cloth wire and a black wire exit the top right rear corner of the box.Rear view of the speaker in a box. There is a small audio amplifier PCB on the left side. The black wire, blue wire, and a yellow/brown wire from the speaker connect to this PCB. You can see the untrimmed zip ties.
Finally got my Kwelatones TL072 Audio Amp boxed and ready for some tunes! 🥳
It works!
Audio test was successful, quiet audio in -> loud audio out. Whoop, whoop!
Left/right balance testing confirmed that I had not got that reversed. Only mistake seems to be with the volume pot, as I have to turn it anti-clockwise to increase the volume. I think I will have to fix that 🤔
Other observations are a bit of hiss, and some mains hum from the laptop.
Next, a box to live in and then I can connect it to my RC2040 🥳
The kit soldering and build is complete... Next I need to test it with some audio and then house it in the small tin, or maybe something a little bigger 🤔
Initial testing so far has just been connecting the 2x 9v batteries and switching it on. The power led illuminated, as hoped for!
I have now soldered all the PCB components. Off board potentiometers, audio sockets and power connectors next.
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The Oasis BBS
Chi ha ucciso Il Conte?
W1CDN
Ian Neill